Hoek-Brown强度准则在强烈砂化白云岩力学参数估算中的应用

Estimation of Mechanical Parameters of Intensively Sandy Dolomite Based on Hoek-Brown Strength Criterion

白云岩砂化是滇中引水工程玉溪段面临的典型地质问题之一。砂化白云岩物理力学参数的准确获取可以为施工和设计提供依据,保障隧洞施工人员的生命财产安全,具有重要的工程意义。强烈砂化白云岩因其岩体结构较为破碎,难以通过制作标准试样进行室内试验获取岩体力学参数。基于此,为了快速获取强烈砂化白云岩岩体力学参数,通过现场调查以及针贯入试验,运用Hoek-Brown强度准则对其岩体力学参数进行估算,并将估算结果与现场岩体平硐试验结果进行对比。研究结果表明:通过Hoek-Brown强度准则估算的强烈砂化白云岩力学参数绝大部分值落在试验值区间内,Hoek-Brown强度准则在强烈砂化白云岩岩体力学参数估算中运用效果良好。根据估算结果给出研究区强烈砂化白云岩的岩体力学参数建议值,可为工程建设提供支撑,具有一定的推广价值。

Dolomite sandification is a typical geological problem in Yuxi segment of Central Yunnan Water Diversion Project.Accurate physical and mechanical parameters of sandy dolomite could offer basis for construction and design,and ensure the safety of life and property of construction personnel.Due to broken structure,intensively sandy dolomite is difficult to be made into standard specimens for laboratory test to obtain its mechanical parameters.In view of this,the mechanical parameters of intensively sandy dolomite is estimated by using Hoek-Brown strength criterion based on field investigation and needle penetration test.The estimation results are compared with those of field adit test.Results manifest that Hoek-Brown strength criterion has good application effect in estimating the mechanical parameters of intensively sandy dolomite rock mass because most of the estimated values are within the range of test results.In addition,the recommended values of mechanical parameters of intensively sandy dolomite in the study area are given to support engineering construction.