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  • 岩石的抗剪强度准则 > 
  • Hoek-Brown强度准则 > 
  • Hoek–Brown参数

Hoek–Brown参数

Hoek–Brown参数

岩石破裂参数 a

参数a是H-B强度准则方程中的指数项,其取值范围为0.50.65(对于非广义Hoek-Brown强度准则,a等于0.5),具体数值取决于岩体的破裂程度。

非线性参数mb = m, s, 且a = 0.5

(下标r表示残余数值)

具有很好结晶解理的碳酸盐类岩石,如白云岩、石灰岩、大理岩

泥质岩,如泥岩、粉砂岩、页岩、板岩

砂质岩,如砂岩,石英岩

细粒、多矿物结晶火成岩,如安山岩、辉绿岩、玄武岩、流纹岩

粗粒、多矿物结晶火成岩和变质岩,如辉长岩、片麻岩、花岗岩

完整岩石试件,实验室试件尺寸,无结构面

RMR = 100,

Q = 500

m = 7.00

s = 1.00

mr = 7.00

sr = 1.00

m = 10.00

s = 1.00

mr = 10.00

sr = 1.00

m = 15.00

s = 1.00

mr = 15.00

sr = 1.00

m = 17.00

s = 1.00

mr = 17.00

sr = 1.00

m = 25.00

s = 1.00

mr = 25.00

sr = 1.00

质量非常好的岩体,紧密互锁,无风化结构面

RMR = 85,

Q = 100

m = 2.40

s = 0.082

mr = 4.10

sr = 0.189

m = 3.43

s = 0.082

mr = 5.85

sr = 0.189

m = 5.14

s = 0.082

mr = 8.78

sr = 0.189

m = 5.82

s = 0.082

mr = 9.95

sr = 0.189

m = 8.56

s = 0.082

mr = 14.63

sr = 0.189

质量好的岩体,轻微构造破坏,结构面未风化,结构面间距13 m

RMR = 65,

Q = 10

m = 0.575

s = 0.00293

mr = 2.006

sr = 0.0205

m = 0.821

s = 0.00293

mr = 2.865

sr = 0.0205

m = 1.231

s = 0.00293

mr = 4.298

sr = 0.0205

m = 1.395

s = 0.00293

mr = 4.871

sr = 0.0205

m = 2.052

s = 0.00293

mr = 7.163

sr = 0.0205

质量中等的岩体,中等风化,结构面间距0.3 到1 m

RMR = 44,

Q = 1

m = 0.128

s = 0.00009

mr = 0.947

sr = 0.00198

m = 0.183

s = 0.00009

mr = 1.353

sr = 0.00198

m = 0.275

s = 0.00009

mr = 2.030

sr = 0.00198

m = 0.311

s = 0.00009

mr = 2.301

sr = 0.00198

m = 0.458

s = 0.00009

mr = 3.383

sr = 0.00198

质量差的岩体,大量风化节理,结构面间距30 到 500 mm

RMR = 23,

Q = 0.1

m = 0.029

s = 0.000003

mr = 0.447

sr = 0.00019

m = 0.041

s = 0.000003

mr = 0.639

sr = 0.00019

m = 0.061

s = 0.000003

mr = 0.959

sr = 0.00019

m = 0.069

s = 0.000003

mr = 1.087

sr = 0.00019

m = 0.102

s = 0.000003

mr = 1.598

sr = 0.00019

质量非常差的岩体,大量严重风化节理,结构面间距小于50 mm,充填夹泥

RMR = 3,

Q = 0.01

m = 0.007

s = 0.0000001

mr = 0.219

sr = 0.00002

m = 0.010

s = 0.0000001

mr = 0.313

sr = 0.00002

m = 0.015

s = 0.0000001

mr = 0.469

sr = 0.00002

m = 0.017

s = 0.0000001

mr = 0.532

sr = 0.00002

m = 0.025

s = 0.0000001

mr = 0.782

sr = 0.00002

岩石的单轴抗压强度σc、泊松比ν和岩石容重γ

岩石强度

岩石类型(例子)

强度

σc

[MPa]

泊松比

ν

岩石容重γ

[kN/m3]

极坚硬岩

大部分的极坚硬岩石,例如完整、坚实致密的石英岩、玄武岩

>150

0,1

28,00 - 30,00

非常坚硬岩

非常坚硬的花岗岩、石英斑岩,非常坚硬的硬质页岩,石英岩,非常坚硬的砂岩和非常坚硬的方解石类岩石

100 - 150

0,15

26,00 - 27,00

坚硬岩

花岗岩,坚硬的砂岩和方解石,石英岩矿脉,坚硬的砾岩,坚硬的矿石,石灰岩、大理岩、白云石、黄铁矿

80 - 100

0,20

25,00 - 26,00

一般坚硬岩

砂岩、矿石、中等坚硬的砂质页岩、板石

50 - 80

0,25

24,00

较软岩

硬的泥岩、软质砂岩和方解石、泥灰岩

20 - 50

0,25 – 0,30

23 - 24,00

软岩

页岩、软的石灰岩、生石灰、盐岩、冻土、无烟煤、泥灰岩、重塑砂岩、软质砾岩、

5 - 20

0,3 – 0,35

22,00 – 26,00

软弱土

固结粘土、残积土、黑煤

0,5 - 5

0,35 – 0,40

20,00 - 22,0

18,00 - 20,00

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