Comprehensive Analysis of Construction Site Monitoring ...

Comprehensive Analysis of Construction Site Monitoring Results of Complex Geotechnical Engineering

Zhu Xin Central Southern China Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting

Group, 430000, China

Keywords: Complex geotechnical engineering, Construction site, Monitoring results, Comprehensive analysis

Abstract: Traditional methods of collecting and analyzing relevant information are not comprehensive, resulting in the low yield of results analysis, and thus it is impossible to achieve an effective comprehensive analysis of the monitoring results of construction sites. In response to this problem, it is necessary to conduct comprehensive analysis of the construction site monitoring results of complex geotechnical engineering. In the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, the geotechnical strength data monitored on the construction site is first imported into the numerical group. Then, a comprehensive analysis of the construction site monitoring results is carried out based on complex geotechnical engineering, through the history matching of data simulation of construction site monitoring results. Finally, simulation experiments are used to prove that the comprehensive analysis method based on the construction site monitoring results of complex geotechnical engineering can successfully analyze the yield, thereby achieving comprehensive analysis of the construction site monitoring results of complex geotechnical engineering.

1. Introduction Geotechnical engineering started in countries in Europe and America in the 1960s and it is a

technical system formed on the basis of the practice of civil engineering. Geotechnical engineering sites are sometimes different in geologic complexity, which leads to the formation of complex geotechnical engineering. Geotechnical engineering can be divided into three types: the first level is the complex geotechnical engineering site; the second level is the medium complex geotechnical engineering site and the third level is the simple geotechnical engineering site [1]. This paper focuses on a comprehensive analysis of the construction site monitoring results of complex geotechnical engineering sites, and thus the first step is to determine the complexity of the complex geotechnical engineering site which is to be analyzed. According to the analysis of the geological characteristics of the complex geotechnical construction sites, they are mainly divided into five types: the section that is dangerous or unfavorable to the earthquake resistance of the building; sections with strong adverse geological effects; sections where the geological environment has been or may be severely damaged; sections with complex topography and landforms; and sections with multiple layers of groundwater and karst fissure water or those actions with complex hydrogeological conditions affecting geotechnical engineering. When determining the complexity level of a geotechnical engineering project, it can be gradually estimated from the first level to the second level and the third level, until meeting the prerequisites. With the rapid development of construction enterprises belonging to different kinds of ownership, the complex geotechnical engineering market is already in a state of intense competition multiple [2]. In order to further improve the yield of the comprehensive analysis of the construction site monitoring results of complex geotechnical engineering and solve the low concentration of the traditional analysis methods on the comprehensive analysis of the construction site monitoring results, the author proposed a comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, on the basis of the existing comprehensive analysis of the monitoring results of complex geotechnical construction sites.

2020 3rd International Conference on Civil Engineering and Biotechnology (CIVEB 2020)

Copyright © (2020) Francis Academic Press, UK DOI: 10.25236/civeb.2020.00418

2. Comprehensive Analysis Method of Construction Site Monitoring Results Based on Complex Geotechnical Engineering

Traditional comprehensive analysis methods of construction site monitoring results generally have a low yield to the analysis of construction site monitoring results, and cannot improve the overall competitiveness of the complex geotechnical engineering industry. In this context, it is necessary to improve the yield of the complex geotechnical engineering industry, so as to seize the opportunities of the times in the increasing socialization of the market. Therefore, in the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering proposed in this paper, the geotechnical strength data of construction site monitoring is imported into the numerical group first. Then, a comprehensive analysis of the construction site monitoring results is carried out based on complex geotechnical engineering, through the history matching of data simulation of construction site monitoring results.

2.1 Introduce the Numerical Group of Geotechnical Strength Data Monitored on the Construction Site

Since the main body of complex geotechnical engineering is rock mass and soil mass, the strength data of rock mass and soil mass must be determined in advance in a complex geotechnical engineering project [3]. The rock mass and soil mass at the construction sites of such kind have gone through a long historical process and have been subjected to repeated effects of a large number of complex geology. Therefore, the rock mass and soil mass at a construction sites have very complex geotechnical characteristics. In the geological survey of complex geotechnical engineering, the problems in the strength data of rock masses and soil masses are the most critical factors, but at the same time they are also the ones which are most likely to be overlooked. From the strength data of rock masses and soil masses, complex geotechnical engineering data can be inferred, such as specific rock and soil properties, their deformation characteristics and permeability characteristics, and so on. The monitoring of the specific geotechnical structure at the construction site is shown in Figure 1.

Fig.1 Geotechnical Structure Map for Construction Site Monitoring

With reference to Fig. 1, assuming that the rock and soil strength data monitored on the construction site is h, a corresponding calculation formula can be obtained, as shown in Formula (1).

h v H= ×∑ (1)

In Formula (1), v refers to the deformation characteristic vector of the geotechnical site monitored at the construction site; H refers to the permeability characteristic vector. In order to

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better analyze the geotechnical strength data monitored on the construction site, it is necessary to import the complex geotechnical data of the construction site --such as the properties, deformation characteristics and permeability characteristics of the rock mass and soil mass -- into the numerical group, and the specific import steps are as follows:

① Define a numerical group for the monitoring results of complex geotechnical construction sites, such as x=ones (a, b, c, d, e, f, g, h);

② Select a latitude in the geotechnical strength data monitored at the construction site as the assigned latitude, and it usually is the one with the smallest value among a, b, c, d, e, f, g, h;

③ Assume b to be the smallest assigned latitude, then choose the second latitude. In other word, b is chosen to be the assigned latitude. Assuming a=13, b=8, c=21, d=22, e=17, f=15, g=10, h=11, it can be drawn that there are 8 defined numerical groups of geotechnical strength monitored on the construction site, namely y1~y8;

x(:,1,:)=y1 x(:,2,:)=y2 .... x(:,8,:)=y8 ④ End the import of the geotechnical strength data. In the process of importing the geotechnical strength data monitored on the construction site into

the numerical group, it should be noted that y1~y8 are the numerical groups of 2 rows and 11 columns. After the assignment, the import of the geotechnical strength data from the construction site can be completed. The specific numerical table for monitoring the geotechnical strength at the construction site is shown in Table 1.

Table 1 Numerical Table of Geotechnical Strength Monitored on the Construction Site No. of complex geotechnical project

Coordinate Vector of deformation characteristics

Vector of permeability characteristic X Y

01 ones 7111278 y8 0188001 1014.30 1089.70 02 ones 7111303 y8 0188002 1119.00 1085.32 03 ones 7111068 y8 0187003 1026.00 1084.45 04 ones 7111065 y8 0187004 1017.00 1089.00 05 ones 7111050 y8 0187005 1020.00 1186.00 06 ones 7111043 y8 0187006 1121.20 1201.80 07 ones 7111030 y8 0187007 1029.30 1086.70 08 ones 7111028 y8 0187008 1117.80 1096.20 09 ones 7111048 y8 0187008 1124.50 1196.50 10 ones 7111048 y8 0187008 1113.00 1206.08 11 ones 7111798 y8 0187008 1078.54 1154.78

2.2 History Matching of Data Simulation of Construction Site Monitoring Results On the basis of importing the geotechnical strength data from the construction site into the

numerical group, it is not difficult to find that the grid number of the numerical group of the construction site monitoring results will be very large. This means that parallel computing may be needed in the actual operation process of the history matching of the simulation data of the construction site monitoring results [4]. The discontinuity of the history matching of data simulation of construction site monitoring results in the plane reservoir is not serious, so the effective thickness or effective porosity can be used as the cut-off value, and other places can be set as invalid grids. In order to ensure the anisotropy of history matching of the simulation data of the construction site monitoring results, it may be necessary to establish multiple rock type zonings on the construction site based on complex geotechnical engineering. Then, according to the actual properties, deformation characteristics and permeability characteristics of rock masses and soil masses of complex geotechnical engineering, different relative permeability curves and capillary pressure curves can be used in analysis. In the actual operation of the history matching of the data simulation of the construction site monitoring results, the larger the numerical value group of the rock and soil strength, the greater the changes of the fluid. And therefore, multiple geological data of construction

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site monitoring results must be built in strict accordance with the geological data of the construction site to monitor the geotechnical water-based properties, deformation characteristics and permeability characteristics of complex geotechnical construction sites. The severe channeling phenomenon caused by multi-layer production will make it difficult to complete the history matching of PLTEL data. Therefore, it is necessary to carry out history matching of the monitoring data of the construction site based on complex geotechnical engineering.

To sum up, the history-matched reserves of construction site monitoring results data simulation depend on pore volume and saturation [5]. The history-matched pore volume is related to the structure and porosity of complex geotechnical engineering, and saturation is related to data initialization. Therefore, when performing history matching on the data simulation of the construction site monitoring results, some parameters can be adjusted according to the actual situation of complex geotechnical engineering, and they are respectively are: porosity of complex geotechnical engineering, NTG, oil-water interface monitored on the construction site and capillary pressure of complex geotechnical engineering. In the Petrel software geological model, the calculated reserves that can be found in the history matching of the data simulation of construction site monitoring results include OIP, GIP, WIP and RIP. Through the simulation of history matching reserves of complex geotechnical engineering values of each grid, the accuracy of comprehensive analysis of construction site monitoring results can be effectively improved, which can lay a solid foundation for comprehensive analysis of construction site monitoring results based on complex geotechnical engineering.

2.3 Comprehensive Analysis of Construction Site Monitoring Results Based on Complex Geotechnical Engineering

By simulating and matching historical data of construction site monitoring results, it is practical to realize a comprehensive analysis of construction site monitoring results based on complex geotechnical engineering. First of all, it is needed to strictly follow the specific procedure of the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, and directly import the geotechnical strength data monitored on the construction site into the numerical group. Then, the monitoring results of the construction site can be comprehensively analyzed by judging the nature of complex geotechnical engineering. In this way, it is feasible to obtain a more comprehensive analysis effect of the monitoring results of the construction site and achieve a comprehensive analysis of the construction site monitoring results of complex geotechnical engineering, thereby substantially improving the yield of the analysis of the construction site monitoring results. Through the history matching of the data simulation of the construction site monitoring results, it is possible to comprehensively analyze the construction site monitoring results under the numerical integration of the monitoring of the geotechnical strength of the construction site based on complex geotechnical engineering. In the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, the history matching of the data simulation of construction site monitoring results adopts multivariate data, which can greatly improve the reliability and accuracy of construction site monitoring results data and describe in detail the specific conditions based on complex geotechnical engineering. In order to meet the actual construction situation, there is detailed grid generation for the history matching of data simulation data of construction site monitoring results. In this way, the type and degree of comprehensive analysis of construction site monitoring results can be reasonably formulated based on the actual situation of complex geotechnical engineering, which is closer to practical application.

3. Simulation Experiment 3.1 Experimental Preparation

In order to demonstrate the effectiveness of the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, simulation experiments was

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adopted in this paper to ensure the superiority of the comprehensive analysis method of construction site monitoring results. The content of this simulation experiment focused on the experiment on the yield of the comprehensive analysis of the construction site monitoring results. In order to ensure the authenticity of the simulation experiment results, the entire experiment was conducted in a unified environment, the monitoring results of the same construction site were selected for the experiment, and the hardware equipment model standards used in the experiment were completely unified. In order to ensure the universality of simulation experiments, 10 times of experiments were conducted in this research and two analysis methods were used to collect 5 sets of comprehensive analysis data of construction site monitoring results. First of all, the author used the traditional method to comprehensively analyze the construction site monitoring results, and then adopted the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering designed in this study to implement the same operation steps. The traditional comprehensive analysis method of construction site monitoring results was set as the control group for comparative experiments.

3.2 Analysis and Conclusion of Experimental Results According to the designed simulation experiment above, the author recorded 5 sets of

experimental data, and compared the results analysis yields obtained by the two analysis methods for the comprehensive analysis of the construction site monitoring results In order to more intuitively reflect the difference between the comprehensive yield analysis of the construction site monitoring results by the two analysis methods, the simulation experiment results were drawn as a curve, as shown in Figure 2 below.

Fig.2 Comparison of Result Analysis Yields

According to Figure 2, the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering designed in this study has a significantly improved yield compared with the traditional comprehensive analysis methods. Therefore, the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering can improve the accuracy of comprehensive analysis and achieve comprehensive analysis of complex geotechnical engineering site monitoring results.

4. Conclusion As more and more attention is given to the monitoring of complex geotechnical construction

sites, the depth of the result analysis has also increased. Through the comprehensive analysis method of construction site monitoring results based on complex geotechnical engineering, this paper is committed to improving the growth rate of comprehensive analysis yield. The comprehensive analysis of the construction site monitoring results of complex geotechnical

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engineering has gone through a process from the start to the rapid development. At present, there has been an upsurge in most construction sites around the world for the comprehensive analysis method of the construction site monitoring results based on complex geotechnical engineering. Although the comprehensive analysis methods of construction site monitoring results based on complex geotechnical engineering are still in an incompletely mature stage at present, they will advance with the progress of complex geotechnical engineering, and the improvement is endless. The development of complex geotechnical engineering is bound to develop in the direction of cloud platform, intelligence and humanization, which will help to maximize the comprehensive analysis of the construction site monitoring results of complex geotechnical engineering.

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