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SHALSTAB耦合了稳态水文假定模型和无限斜坡稳定性模型,主要用于评价浅层滑坡稳定性的时空分布和发展趋势。选择黄土高原甘肃陇东地区华池县作为研究区,评价SHALSTAB模型在黄土沟壑区浅层滑动稳定性分析中的适用性和可靠性,利用1:5000地形图获得了数字高程模型和地形坡度,以及室内和现场试验的物理力学参数,结合现场钻探和探槽得到的土层厚度分布和地表稳定性指数等级分布图。现场测量绘制的滑坡分布图与模拟结果对比和统计分析表明,SHALSTAB模拟的总体正确率为70.23%,滑坡预测正确率为72.33%,稳定状态预测正确率为67.51%,模拟效果良好。
SHALSTAB coupled steady-state hydrological assumption model and infinite slope stability model is mainly used to evaluate the temporal and spatial distribution of shallow landslide stability and development trend. The author selected Huachi County in Longdong area of Gansu as a study area to evaluate the applicability and reliability of SHALSTAB model in shallow sliding stability analysis in loess hilly and gully regions. The digital elevation model and topographic gradient were obtained by 1: 5000 topographic map. As well as the physical and mechanical parameters of indoor and field tests, combined with the thickness distribution of soil layer and surface stability index grade distribution obtained by field drilling and trenching. The comparison between landslide distribution and the simulation results and statistical analysis show that the overall accuracy of SHALSTAB simulation is 70.23%, the accuracy of landslide prediction is 72.33%, the prediction accuracy of steady state is 67.51%, and the simulation results are good.