基于Hoek-Brown强度准则的溶蚀作用下灰岩力学参数计算方法  

Calculation Method of Mechanical Parameters of Limestone Under Dissolution Based on Hoek-Brown Strength Criterion

作　　者：何城虎 汤艳春[1,2] HE Chenghu;TANG Yanchun(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University,Yichang 443002,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2024年第5期62-67,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(51779129)。

摘　　要：Hoek-Brown强度准则广泛使用于岩石及岩体工程中,针对地下工程中灰岩围岩洞室受溶蚀作用其稳定性会降低的问题,提出一种相应的参数计算方法.基于Hoek-Brown强度准则中可描述溶蚀作用下灰岩的力学特性的地质强度指标G,构建其与卸载点值和溶蚀时间的函数方程.通过灰岩单轴压缩试验结果,并结合Flac3D软件数值模拟得出函数方程的参数.为验证计算方法的合理性,将试验结果和数值模拟结果进行对比,结果表明计算结果和试验结果吻合度高.最后归纳出G的变化率随卸载点、溶蚀时间的演化规律.上述研究成果可对溶蚀作用下的洞室围岩稳定性动态演化规律的相关计算与数值模拟提供理论支撑.Hoek-Brown strength criterion is widely used in rock and rock mass engineering.Aiming at the problem that the stability of limestone surrounding rock caverns in underground engineering is usually reduced by dissolution,a corresponding parameter calculation method is proposed.Based on the geological strength index G which can describe the mechanical properties of limestone under dissolution in Hoek-Brown strength criterion,a function corresponding to unloading point value and dissolution time is constructed.Based on the results of uniaxial compression test of limestone and the numerical simulation of Flac3D software,the parameters of the function are obtained.In order to verify the rationality of the calculation method,the test results are compared with the numerical simulation results.The results show that the calculated results are in good agreement with the experimental results.Finally,the evolution law of the change rate of G with unloading point and dissolution time is summarized.The above research results can provide theoretical support for the relevant calculation and numerical simulation of the dynamic evolution law of cavern surrounding rock stability under dissolution.

关 键 词：灰岩 溶蚀作用 HOEK-BROWN 力学参数 

分 类 号：TU411.3[建筑科学—岩土工程]