黄土裂隙的漫灌效应对斜坡稳定性的影响分析

发布时间：2018-06-29 14:23

本文选题：黑方台 + 黄土滑坡　；参考：《水文地质工程地质》2017年04期

【摘要】：以甘肃省黑方台地区滑坡为研究对象,在非饱和土特性试验基础上,根据地下水位的监测资料建立典型斜坡饱和-非饱和渗流模型,模拟斜坡灌溉作用后裂隙对斜坡渗流场的影响,研究斜坡裂隙效应对斜坡稳定性的影响。结果表明:灌溉水迅速沿裂隙下渗,形成渗流优势通道;裂隙附近土体的孔隙水压力迅速升高,导致其局部形成饱和区域;随着裂隙数量的增加,饱和区域明显增大,且裂隙的位置越靠近台塬边缘,对斜坡边缘的孔隙水压力及基质吸力影响越显著。综合斜坡稳定性分析结果可知:裂隙发育位置越靠近台塬边缘,斜坡稳定性越差;而裂隙数量的增加对于斜坡的稳定性影响更大,且裂隙对于斜坡稳定性的影响是一个短时间过程。夯填裂缝是控制滑坡发生的有效途径。
[Abstract]:Taking the landslide in Heifangtai area of Gansu Province as the research object, based on the characteristic test of unsaturated soil, the saturated-unsaturated seepage model of typical slope is established according to the monitoring data of groundwater level. The effects of cracks on the seepage field of slopes after slope irrigation were simulated, and the effects of crevices on slope stability were studied. The results show that irrigation water infiltrates rapidly along the fissure and forms the dominant seepage channel. The pore water pressure of the soil near the fissure increases rapidly, leading to the formation of local saturated area, and with the increase of the number of cracks, the saturated area increases obviously. The closer the fissure is to the edge of tableland, the more significant the influence on pore water pressure and matrix suction of slope margin is. The results of comprehensive slope stability analysis show that the closer the fracture is to the edge of the tableland, the worse the slope stability is, and the greater the number of cracks is, the greater the influence on the stability of the slope is. Moreover, the influence of cracks on slope stability is a short time process. Tamping cracks is an effective way to control the occurrence of landslide.
【作者单位】：西北大学地质学系大陆动力学国家重点实验室;中国地质调查局西安地质调查中心;
【基金】：中国地质调查局项目(12120114025701) 国家自然科学青年基金项目(41202187) 国家自然科学基金重点项目(41630639) 西北大学研究生自主创新基金(YZZ15021)
【分类号】：P642.22

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