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三维地质模型构建可实现岩土体内部结构的可视化,三维极限平衡分析方法可实现对边坡的稳定性进行评价,两者之间的集成将充分发挥GIS在空间数据操作上的优势,同时还可以实现基于力学原理的稳定性分析评价,能弥补GIS在边坡稳定性评价方面的不足。该文基于三维地质建模并针对三维Sarma法的不足,提出了将条柱间与底部滑动面采用不同的物理参数和不同时处于破坏状态的改进措施;基于GOCAD的边坡稳定分析系统进行二次开发,研究了采用Sarma法计算所需各种参数的获取方法,通过程序实现了三维地质模型向三维Sarma法的数据自动转换过程;针对金安桥水电站B2崩塌体,利用GOCAD软件建立了边坡地质体的三维地质模型,并采用Sarma法评价了堆积体边坡在不同工况下的稳定性,分析不同的工况对边坡稳定的影响,从地质建模的角度为边坡稳定性评价提供了理论基础。
Three-dimensional geological model construction can realize the visualization of the internal structure of rock and soil. The three-dimensional limit equilibrium analysis method can evaluate the stability of the slope. The integration between the two will give full play to the advantages of GIS in the operation of spatial data, Can realize the stability analysis and evaluation based on mechanics theory, and can make up for the shortage of GIS in slope stability evaluation. Based on the 3D geologic modeling and the deficiency of the 3D Sarma method, this paper proposes the improvement measures of using different physical parameters of the sliding surfaces between the columns and the bottom and the failure modes at the same time. The slope stability analysis system based on GOCAD This paper studied the acquisition method of various parameters required by Sarma method and realized the automatic data conversion process from 3D geological model to 3D Sarma method. According to the B2 collapse body of Jin’anqiao Hydropower Station, the authors used GOCAD software to establish the slope geology Dimensional geological model of Slope, the Sarma method was used to evaluate the stability of the pile slope under different working conditions. The influence of different working conditions on slope stability was analyzed, and the slope stability evaluation was provided from the perspective of geological modeling The theoretical basis.