贵州鱼简河水库拱坝地基软硬互层岩体等效弹性模量的试验研究

Experimental Study on Elastic Modulus of Soft and Hard Interbedded Rockmass of the Yujianhe Reservoir Arch Dam Foundation in Guizhou

软硬互层岩体弹性模量的大小对贵州省鱼简河水库拱坝的优化设计具有举足轻重的作用。对坝址区泥岩与泥质白云岩的弹性模量进行了现场承压板试验，试验所得弹性模量为塑性松动圈的弹性模量，利用GSI法可求出比较符合实际的弹性模量。在以上试验成果的基础上，根据泥岩与泥质白云岩的实际厚度，建立了岩体结构模型，并考虑岩体应力状态，利用ANSYS软件对复合层状岩体进行了三轴压缩试验的计算机模拟。结果表明：复合层状岩体平行层面与垂直层面方向的等效弹性模量分别为2．57～3．93MPa与0．48～2．99MPa。研究成果为拱坝的优化设计提供了技术依据。

The elastic modulus of soft and hard interbedded rockmass is important for the optimal design of the Yujianhe reservoir arch dam in Guizhou Province. The elastic modulus of mudstone and argillaceous dolomite has been tested with in-situ bearing plate test in the paper. The elastic modulus obtained by in-situ test is the elastic modulus of rock mass of plastic relaxation zone. The proper elastic modulus can be calculated with the GSI method. Based on the in-situ test results, the thickness of mudstone and argillaceous dolomite was measured, and a rock structure model was set up. In order to study the equivalent elastic modulus in the parallel and perpendicularity direction with the stratum surface in complex layer rockmass, the stress condition of rockmass was considered, and a triaxial compression test was simulated with AN- SYS software. The result shows that the equivalent elastic modulus in the parallel and perpendicularity direction with the stratum surface is 2.57--3.93 MPa and 0.48--2.99 MPa. This will favor the optimal design of the arch dam.