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针对现阶段3维土坡滑动面搜索方式存在效率低、容易出现局部极值等问题,基于GIS栅格数据模型,提出以随机搜索确定初始滑动面、以模式搜索确定最终滑动面的3维土坡最危险滑动面搜索方式。结合该搜索方式,开发土坡稳定3维刚体法分析程序(Slope3D-SCU),并通过算例对该程序的稳定性与合理性进行验证。研究表明:该搜索方法不仅避免了安全系数在临界滑动面搜索过程中出现局部极值的情况,同时能提高滑动面搜索效率;该程序计算精度高、稳定可靠。依托狮子坪水电站土石坝监测数据,调用渗透压力实时监测结果,利用该程序对其坝坡在运行工况下3维稳定性进行分析,揭示了该土石坝坝坡的3维稳定特性。研究结果表明,该坝坡在运行工况下安全系数较高,坝坡处于稳定状态。
According to the grid data model of GIS, the initial sliding surface is determined by random search and the final 3-D soil is determined by pattern search The most dangerous sliding surface search method. Combining with the search method, a stable 3-D rigid body analysis program (Slope3D-SCU) is developed, and the stability and rationality of this program are verified by examples. The research shows that this method not only avoids the local extremum of the safety factor during the critical slip surface search, but also improves the searching efficiency of the sliding surface. The calculation accuracy is high and the algorithm is stable and reliable. Based on the monitoring data of earth-rock dam of Shiziping Hydropower Station, the real-time monitoring results of seepage pressure are invoked. By using this program, the 3-dimensional stability of the dam slope under operating conditions is analyzed, and the 3-D stability characteristics of the earth dam are revealed. The results show that the safety factor of dam slope is high under operating conditions, and the dam slope is in a steady state.