基于声波波速的火谷混凝土坝固结灌浆后建基面基岩抗剪断强度参数确定  

Determination of Shear Strength Parameters of Bedrock on Foundation Surface of Huogu Concrete Dam After Consolidation Grouting Based on Acoustic Wave Velocity

作　　者：应政勋 陈新[1] 张菁菁 YING Zheng-xun;CHEN Xin;ZHANG Jing-jing(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2021年第10期102-105,203,共5页Water Resources and Power

基　　金：水资源高效开发利用重点专项(2018YFC0406803)。

摘　　要：根据火谷混凝土坝基岩声波波速与地质强度指标GSI建立的关系式,采用材料力学法计算建基面基岩的实际最小主应力,应用Hoek-Brown准则确定灌浆前建基面基岩的抗剪断强度参数,并基于室内试验所给出的抗剪断参数建议值,分别运用抗滑稳定公式计算建基面基岩的抗滑稳定安全系数。结果表明,该方法对应的抗滑稳定安全系数与建议参数对应值较为吻合。继而用声波波速计算灌浆后基岩的抗剪断强度参数,发现其抗滑稳定安全系数较建议参数对应值有所提高。According to the relationship between bedrock acoustic wave velocity and geological strength index GSI of Huogu concrete dam,the actual minimum principal stress of bedrock on foundation surface was calculated by mechanics of materials.Based on the recommended values of shear parameters given by laboratory tests and the values obtained by Hoek-Brown criterion,the anti-slide stability safety factor of bedrock on the foundation surface is calculated by using the anti-slide stability formula.The results show that the safety factor of anti-slide stability corresponding to the method is consistent with the corresponding value of the recommended parameters.Then the shear strength parameters of bedrock after grouting were calculated by acoustic wave velocity,and the safety factor of anti-slide stability is higher than the corresponding value of recommended parameters.

关 键 词：固结灌浆 建基面基岩 抗剪断强度参数 抗滑稳定安全系数 HOEK-BROWN准则 声波波速 

分 类 号：TV642.3[水利工程—水利水电工程] TU45[建筑科学—岩土工程]