1 P roiectarea unui tunel de cale ferată simplă cu boltă supraînălțată Să se proiecteze căptușeala unui tunel de cale ferată cu ecartament normal pentru linie simplă sub formă de boltă supraînălțată. Acesta străbate un masiv muntos pentru care se cunosc următoarele caracteristici:  Caracteristici geotehnice Grupa 3406 –  Nr. impare Grupa 3406 –  Nr. pare Coeficientul de duritate al rocilor după Protodiaconov 15 0 1 rez   f , , N  5 4 01 rez   f , , N  Greutatea volumică de calcul a rocii 3 19 8 [ ]  , kN / m     3 20 1 [ ]  , kN / m     Coeficientul de compresiune elastic a rocii pe talpa fundației 5 3 1 6510 [ ] k , kN / m  5 3 1 6910 [ ] k , kN / m  Coeficientul de compresiune elastic a rocii pe suprafața laterală 5 3 2 5 1 10 [ ] k , kN / m  5 3 2 5 4 10 [ ] k , kN / m  Coeficientul de frecare  beton-rocă 0 35  ,    0 4  ,    Gabaritul de construcție a tunelului pentru fibra mediană este dat de următoarele date:   Numere impare Numere pare 1 265 [ ]  R , m  0 1  49    1 250 [ ]  R , m  0 1  47    2 475 [ ]  R , m  0 2  74    2 460 [ ]  R , m  0 2  73    3 860 [ ]  R , m  0 3  105    3 845 [ ]  R , m  0 3 104    Căptușeala se execută din beton având greutatea volumică: 3 24 00 [ ] b  , kN / m    (numere impare), 3 23 5 [ ] b  , kN / m    (numere pare).
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