Hoek-Brown准则改进及应用

doi:10.13722/j.cnki.jrme.2015.0210

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摘要 Hoek-Brown屈服准则优点突出，但使用时所需的扰动因子D和地质强度指标GSI值两大参数难以准确获取。对此，总结分析学者们对传统Hoek-Brown准则的改进，提出能较便捷、精准地解决该问题的方法：利用扰动岩体波速VP和岩石纵波波速比值的平方计算扰动因子D，通过岩体纵波波速VP与岩体RMR值的关系来计算岩体的GSI值。进而，将D和GSI的表达式代入Hoek-Brown准则中，得到新的改进公式。为验证改进公式的合理性，以黄河玛尔挡水电站大坝坝基岩体工程为例，分别对该改进方法计算得到的岩体物理力学参数与Hoek-Brown法计算结果进行对比。结果显示，该改进方法计算结果与Hoek-Brown法计算结果趋势走向一致、数值相差较小。据此，该方法可满足工程应用，尤其是可用于快捷、准确计算出Hoek-Brown准则中的两大参数，进而计算岩体的力学参数。

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关键词 ：岩石力学, Hoek-Brown准则, 纵波波速VP, GSI值, 岩体参数

Abstract：Hoek-Brown failure criterion has prominent advantages. However，when using the criterion，it is difficult to accurately obtain disturbed factor D and geological strength index GSI-value，that are the two main parameters in the criterion. According to this，This paper puts forward a convenient and accurate method to determine the two parameters，after summary analyzing scholars improvements of the traditional Hoek-Brown criterion. To get the disturbed factor D，this paper uses the square of ration between P-wave velocity of rock mass and rock. Then to obtain the GSI-value，this paper uses the relationship between the P-wave and rock mass rating RMR-value. Further，This paper puts the formulas of D and GSI into Hoek-Brown criterion to obtain a new modified criterion. In order to verify the modified criterion is reasonable，rock mass physical-mechanical parameters are respectively calculated by modified criterion and Hoek-Brown criterion for comparison，basing on the Yellow River Maerdang hydropower station dam foundation rock mass engineering case. The results of the two criterions show the same trend and the numeral difference is very small. Therefore，the modified criterion can satisfy the engineering application. Especially，it can be used to quickly and accurately calculate the two main parameters in Hoek-Brown criterion，and then calculate the mechanical parameters of rock mass.

Key words： rock mechanics Hoek-Brown criterion velocity of longitudinal wave(VP) GSI-value parameters of rock mass

引用本文:

李硕标1，2，薛亚东1，2. Hoek-Brown准则改进及应用[J]. 岩石力学与工程学报, 2016, 35(S1): 2732-2738.
LI Shuobiao1，2，XUE Yadong1，2. Modification of Hoek-Brown criterion and its application. , 2016, 35(S1): 2732-2738.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0210 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2732

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