现代地质Issue(2)：408-413,6.
灌溉引起地下水位上升对斜坡稳定性的影响--以甘肃黑方台为例
Effect on Slope Stability due to Groundwater Rising Caused by Irrigation:A Case Study of Heifang Platform in Gansu,China
摘要
Abstract
Irrigation-induced loess landslides are common geological disasters in the Loess Plateau region,and its essence is the groundwater rising which caused loess matric suction falling and intensity decreasing,eventually leading to the instability process of loess slope.In this paper,taking Heifang platform typical slope for example, we studied the variation of seepage field internal the loess slope which caused by the groundwater level rising, and investigated the affect that the groundwater level changes on slope stability,which both based on the charac-teristics test of unsaturated soil and the saturated-unsaturated seepage analysis.The results show that the groundwater level rises which has an obvious effect on pore pressure distribution internal slope and results in the saturation region increasing and matric suction reducing in unsaturated zone.There is a linear relationship be-tween decreasing of matric suction internal slope and groundwater level.We made unsaturated limit equilibrium analysis in the typical slope,based on seepage analysis.The results show that there is approximate linear rela-tionship between groundwater level rising and stability coefficient decreasing.Slope instability occurs,while groundwater level in loess layer of about 21 m,100 m from the top of the hill.关键词
灌溉/基质吸力/渗流场/斜坡/稳定性Key words
irrigation/matric suction/seepage field/slope/stability分类
天文与地球科学引用本文复制引用
谷天峰,朱立峰,胡炜,王家鼎,刘亚明,冯力..灌溉引起地下水位上升对斜坡稳定性的影响--以甘肃黑方台为例[J].现代地质,2015,(2):408-413,6.基金项目
国家自然科学青年基金项目（41202187）；中国地质调查局项目（12120114025701）。 （）
