Geomechanics Classification RMR SYSTEM

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Geomechanics ClassificationGeomechanics Classification

(RMR System)(RMR System)

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Geomechanics Classification(RMR System)Geomechanics Classificatio

n(RMR System)

Rock Mass Rating (RMR) System telah dikembangkan olehBieniawiski pada tahun 1973.RMR System menggunakan enam parameter yang terukur di

lapangan antara lain :

1. Uniaxial Compressive Srength of intack rock material2. Rock Quality Designation (RQD)

3. Spacing Of Discountinous

4. Condisition Of Discountinous

5. Ground water Condition

6. Orientation Of discountinous

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Untuk RQD didapat dari pemboran, cara menghitung RQD :

Geomechanics Classification(RMR System)Geomechanics Classificatio

n(RMR System)

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Penilaian dengan metode RMR System ditentukan dengan kondisi ke

enam parameter yang dengan rating penilaian sebagai berikut :

Geomechanics Classification(RMR System)Geomechanics Classification

(RMR System)

1. Classification Parameters Ratings

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1. Rating Adjusment For Discountinuity Orientation

Geomechanics Classification(RMR System)Geomechanics Classification

(RMR System)

1. Rock Mass Classes Determined From Total Rating

1. Meaning Of Rock Classes

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Geomechanics Classification(RMR System)Geomechanics Classification

(RMR System)

1. Guidelines For Classification Of Discountinuity Condition

1. Effect Of Discountinuity Strike And Dip Orientation In Tunnelling

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Tunnel pada batuan granite dengankemiringan memotong dip 60o. Daritest dengan pengujian Point Load di

dapat nilai 8 MPa, dengan rata-rataRQD 70%. Kondisi Joint terlihatslightly rough (agak kasar) dan agak 

terlapukkan dengan separasi < 1 mm,spasi bidang lemah 300mm danpanjang rata-rata bidang lemah 2 m.

Geomechanics Classification(RMR System)Geomechanics Classification(RMR System)

Contoh:Contoh:

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Geomechanics Classification(RMR System)Geomechanics Classification(RMR System)

Pada Condition Of Discountinuites,

 jika data yang didapat hanya separasi

< 1mm dan kekasaran agak kasar, bisa

langsung didapat rating 25.

Tetapi informasi lebih detail telah

kita dapatkan:

Discountinuity length 2 m --- 4

Separation 0,1 – 1 mm---- 4

Roughness ( slightly rough)----3

Infilling (no infilling)---- 6

Weathering ( slightly weathered)---5Total = 22

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Hasil RMR rating didapat 59, berarti termasuk dalamkelas III (Fair Rock) dengan deskripsi :

Average Stand Up Time ------- 1 week for 5 m

span

Cohesion of the rock mass---------- 200 – 300 kPa

Friction Angel of the rock mass ------- 25 – 35o

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Dari nilai RMR Rating yang telah diperoleh, dapat ditentukan :2. Beban Penyangga Maksimum (Load Support) dengan persamaan :

2. Tinggi beban Batuan Maksimum

 B RMR

 P  γ  100

100−=

 B RMR

ht 

−=

100

100

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Dan juga, dari RMR bisa di rancang estimasi penggalian dan penguatan

yang dibutuhkan, dapat dilihat pada Tabel dibawah ini :