geomechanics classification rmr system
TRANSCRIPT
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 1/12
Geomechanics ClassificationGeomechanics Classification
(RMR System)(RMR System)
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 2/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 3/12
Untuk RQD didapat dari pemboran, cara menghitung RQD :
Geomechanics Classification(RMR System)Geomechanics Classificatio
n(RMR System)
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 4/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 5/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 6/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 7/12
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:
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 8/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 9/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 10/12
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
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 11/12
8/14/2019 Geomechanics Classification RMR SYSTEM
http://slidepdf.com/reader/full/geomechanics-classification-rmr-system 12/12
Dan juga, dari RMR bisa di rancang estimasi penggalian dan penguatan
yang dibutuhkan, dapat dilihat pada Tabel dibawah ini :