基于非飽和滲流理論的不同降雨條件下路塹邊坡穩(wěn)定性研究.pdf

1、河北工業(yè)大學(xué)碩士學(xué)位論文基于非飽和滲流理論的不同降雨條件下路塹邊坡穩(wěn)定性研究姓名：任金來申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：李艷春20081201基于非飽和滲流理論的不同降雨條件下路塹邊坡穩(wěn)定性研究 iiSTUDY ON THE STABILITY OF CUTTING SLOPE INFLUENCED BY THE RAINFALL CONDITION BASE ON THE UNSATURATED SEEPAGE THEO

2、RY ABSTRACT With the development of the national economy the quality of the highway Becomes higher and higher, and the deep cut-covering is inescapable， As a transient flow， the unsaturated seepage of the rainfall can ch

3、ange the pore pressure field of highway slopes and reduce the stability of the slope. The slope failure occurred frequently because of rainfall events in recent years. This paper analyzed the change of seepage-field in t

4、he cutting slope on the different conditions of rainfall infiltration based on the saturated-unsaturated seepage theory ,rainfall infiltration theory and 2D transient FEM model. And it analyzed the cutting slope transien

5、t stability based on the transient seepage-field which is calculated on the shear strength theory of unsaturated soil. The following is included: Saturated-unsaturated seepage theory on the condition of rainfall infiltra

6、tion is introduced, and boundary conditions are given on the condition of rainfall infiltration. The deducing process of finite-element control equation of saturated-unsaturated seepage is presented based on Galerkin met

7、hod. The soil-slope stability mechanism under the influence of rainfall infiltration is expatiated compendiously. The road soil slope of Xiang-Lin Road in Yunnan province is analyzed as an example. The transient seepage-

8、field is calculated by finite-element simulation method，and the corresponding distributing drawings of transient pore-water pressure are obtained. Then , based on the shear strength theory of unsaturated soil and pore-wa

9、ter pressure which is obtained above, the paper analyzed the stability of soil slope, and calculated the transient safety factors on different conditions of rainfall infiltration. The Presented methods and models could b

10、e widely used for the numerical analyses on the stability of unsaturated soil slopes. KEYWORDS: rainfall intensity , rainfall duration , cutting slope , saturated-unsaturated seepage , slope stability , pore-water pressu