基于地质雷达超前预报的边坡力学参数选取研究

Study on Mechanical Parameters Selection of Slope Based on GPR Geological Forecast

如何更加准确地获取岩土体的力学参数是提高有限元计算结果准确性的重要前提。以广西都安-河池高速公路在建边坡工程为依托,考虑采用一种以岩体内部破碎性和富水性为依据对岩体进行分块的力学参数选取方法,以地质雷达探测为基本手段,对岩体内部的破碎性和富水性进行探测识别,并基于识别结果对岩体内部进行分块处理及力学参数的分块选取;在有限元数值计算参数赋值时,分别按均质材料进行总体统一赋值和岩体分块处理赋值。经与现场量测结果进行对比,结果表明,基于地质雷达探测的手段对边坡进行分块及参数赋值的方法是可行的,其计算结果与实测值更加吻合。

How to acquire the mechanical parameters of rock and soil more precisely is the premise of improving the precision of finite element calculation. Accordingly, on the basis of a slope engineering under construction of Du＇an -Hechi expressway in Guangxi Zhuang Autonomous Region, the means of mechanical parameters selection according to rock mass block-division based on inside crumbliness and water content was taken into account. The method of GPR （Ground Penetrat- ing Radar） was applied to detect the crumbliness and water content inside the rock mass, and on the basis of the detection resuits, the rock mass was divided into several blocks and the mechanical parameters were selected according to each block. In the process of numerical calculation, the mechanical parameters were selected respectively by homogeneous hypothesis and rock mass-division. Compared with the field measurement, it shows that the new method mentioned above is feasible and the calculation result is more coincide with the measured value.