摘要
水电站工程技术研究中,岩体裂隙抗剪强度参数是岩体稳定性非常重要的参数之一.以某水电站工程为例,为了提供工程边坡和地下洞室围岩岩体稳定性研究所需的裂隙抗剪强度参数,采取钻孔微新状岩体裂隙面芯样,进行室内直剪试验,并据Barton经验公式估算,对此两种方法结果对比分析.试验结果表明,Barton经验公式对平直稍粗糙型裂隙面抗剪强度参数估算结果与室内直剪试验结果基本一致,但对稍起伏稍粗糙型裂隙面抗剪强度参数估算结果与室内直剪试验结果偏差较大,分析认为该经验公式不适用于对高法向应力状态下JRC值偏大的硬性裂隙面抗剪强度的估算.
In the technical research of hydropower station, the shear strength parameter of rock mass is one of the most important parameters of rock mass stability. Taking a hydropower station project as an example, in order to provide the parameters of joint shear strength required for the stability research of the engineering slope and the surrounding rock mass of underground cavern, the core sample of the joint surface of the slightly weathered and fresh rock mass is adopted for the laboratory direct shear test, and according to Barton empirical formula, the results of the two methods are compared and analyzed. The results show that the estimated results of shear strength parameters of straightness and slightly rougher joint surface by Barton empirical formula are basically consistent with the results of direct shear tests in laboratory, but the estimated results of shear strength parameters of slightly rugged and slightly rougher joint surfaces are greatly different from the results of direct shear tests in laboratory. It is concluded that Barton empirical formula is not applicable to the estimation of joint surfaces shear strength with large JRC value under higher normal stress.
作者
李辰舟
邓争荣
李林
袁洋洋
王茂智
孙韬
Li Chenzhou;Deng Zhengrong;Li Lin;Yuan Yangyang;Wang Maozhi;Sun Tao(Changjiang Geological Engineering Corporation(Wuhan),Wuhan 430010,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2019年第S01期150-155,共6页
Journal of China Three Gorges University：Natural Sciences
关键词
岩体裂隙面
室内直剪试验
抗剪强度
Barton经验公式
对比分析
joint surfaces of rock mass
laboratory direct shear test
shear strength
Barton empirical formula
contrastive analysis
