岩体强度参数新解及应用

针对Hoek-Brown强度准则的较复杂地质参数,提出利用Mohr-Coulomb强度准则参数替代。基于2002年版本的Hoek-Brown强度准则,并结合准岩体强度准则,建立了岩石力学参数和Hoek-Brown强度参数之间的新的换算关系式。经算例分析了换算关系式在已知的岩体强度参数条件下,计算出的Hoek-Brown强度参数均在其取值范围之内;并根据单因素控制变量法,得出地质参数m b、s随内聚力增加而减小,随内摩擦角增加而增加;地质参数α受内聚力和内摩擦角影响较小;并将强度参数新解法用于计算巷道围岩塑性区半径。结论是岩石力学参数对地质参数有一定的影响,并且强度参数新解法计算出的塑性区半径为支护定量设计提供理论依据。

Latest explanation of rock mass strength parameters and its application

Aiming at more complex geologic parameter of Hoek-Brown strength criterion , it was proposed to substi-tute by Mohr-Coulomb strength criterion parameter .Based on the 2002 version of Hoek-Brown strength criterion , and combining with the rock mass strength criteria , a new conversion relational expression between the rock me-chanics parameters and parameters of Hoek-Brown strength was established .Through example analysis , under the condition of known rock mass strength parameters , the obtained Hoek-Brown strength parameters by the conversion relational expression were within its scope .According to single factor analysis method , it showed that the geological parameters mb , s decrease with the increase of cohesion , and increase with the increase of internal friction angle , and the influence on geological parameter αby the cohesion and internal friction angle is smaller .The new method was used to calculate the radius of plastic zone in surrounding rock of roadway .It showed that the rock mechanics parameter has a certain influence on geological parameters , and the radius of plastic zone obtained by the new method can provide theoretical basis for quantitative design .