Hoek-Brown强度准则在过去的20 a里得到不断的更新和完善。最近Hoek和Brown对以往的版本进行了归纳和总结,提出了2018版。这一版本纳入了定量的扰动因子D来确定强度指标,但是扰动因子D取值范围为0~1,涵盖了地下工程和边坡工程,又包括了从控制良好到控制不良的各种开挖工况,取值范围较大。对开挖爆破通常进行严格控制的水利水电工程边坡,需要研究其相应的扰动因子取值范围。对一个典型算例在大范围变动几何和物理力学参数情况下,比较了Hoek-Brown强度准则GSI—1995和GSI—2018两个版本的稳定安全系数。结果表明:当扰动因子D在0.78~0.88范围内取值时,两个版本求得的安全系数相当。本研究进一步考察了昌马、紫坪铺和柴石滩水库这3个曾按“1995版”开展过边坡稳定分析的工程实例,结果表明2个版本等效的扰动因子D取值范围为0.72~0.85。因此,在水电边坡工程分析中使用GSI—2018,建议其扰动因子取值范围可考虑在0.7~0.9之间。
Abstract
The Hoek-Brown failure criterion for determination of non-linear shear strength of rock mass has been under constant upgrading during the past two decades. The latest 2018 version summarizes the main issues on utilizations and key factors of this system. One major concern of using this system comes from the appropriate selection of the disturbance factor D that ranges from 0 to 1, covering the applications in tunneling and slope engineering with conditions varying from well controlled to uncontrolled excavations. This paper focuses on the values of D that best fits the application in hydro-slopes, normally excavated under controlled blasting works. The main approaches include the comparisons between GSI-1995 and GSI-2018 versions. The former has been suggested in China’s hydro-slope design standard. A simple test example was investigated by varying its geometry and physical parameters, with the finding that D ranges from 0.78 to 0.88 as the two versions offer the same factor of safety. Three engineered slopes of hydropower projects that originally adopted GSI-1995 version were investigated. The calibration work that equivalents the two versions suggests that D ranges from 0.72 to 0.85. The authors then suggest adopting D ranging from 0.7 to 0.9 for hydro-slope design.
关键词
Hoek-Brown强度准则 /
扰动因子 /
地质强度指标 /
稳定性分析 /
水电边坡工程
Key words
Hoek-Brown failure criterion /
disturbance factor /
GSI method /
stability analysis /
hydro-slope engineering
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参考文献
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基金
国家重点研发计划项目(2018YFC0407003,2017YFC1501103)
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