Influence of different drying rates on stability of cut slope of expansive soils
XU Kai1, GENG Zhi-zhou1, LI Xiong-wei2
1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 2. Changzhou Institute of Technology, Changzhou 213002, China
Abstract：For the expansive soils of Nanning in Guangxi province of China different drying environments are acquired to test the shrinking characteristics and water retention by setting different temperature and humidity conditions. The unsaturated permeability curves under different drying rate are predicted. The infiltrating process of cut slope is numerically simulated. The test results show that the slow drying rate produce a large shrinking deformation. The sustainable evaporation with high humidity results in a large potential swelling deformation in shallow strata. The numerical computation indicates that an evaporation process of slow drying rate produces a large infiltration depth. It is concluded that the sustainable evaporation with high humidity induces a large infiltration depth, which is adverse to the stability of cut slope of expansive soils.
徐锴,耿之周,李雄威. 脱湿速率对膨胀土堑坡稳定性的影响分析[J]. 岩土工程学报, 2017, 39(s1): 131-134.
XU Kai, GENG Zhi-zhou, LI Xiong-wei. Influence of different drying rates on stability of cut slope of expansive soils. Chinese J. Geot. Eng., 2017, 39(s1): 131-134.
[1] 李雄威, 孔令伟, 郭爱国, 等. 吸湿速率对膨胀土工程性状影响的初步分析[J]. 湖南大学学报 (自然科学版), 2008, 35(增刊): 154-157. (LI Xiong-wei, GUO Ai-guo, KONG Ling-wei, et al. Preliminary analysis of expansive soil engineering behavior considering the effect of wetting rate[J]. Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences, 2008, 35(S0): 154-157. (in Chinese)) [2] 孔令伟, 李雄威, 郭爱国, 等. 脱湿速率影响下的膨胀土工程性状与持水特征初探[J]. 岩土工程学报, 2009, 31(3): 335-340. (KONG Ling-wei, LI Xiong-wei, GUO Ai-guo, et al. Preliminary study on engineering behaviors and water retention characteristics of expansive soil under influence of drying rate[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(3): 335-340. (in Chinese)) [3] FREDLUND D G., RAHARDJO H. Soil mechanics for unsaturated soils[M]. New York: John Wiley & Sons, 1993. [4] NING LU, WILLIAM J LIKOS. Unsaturated soil mechanics[M]. New Jersey: John Wiley & Sons, 2004. [5] 龚壁卫, 周小文, 周武华. 干-湿循环过程中吸力与强度关系研究[J]. 岩土工程学报, 2006, 28(2): 207-209. (GONG Bi-wei, ZHOU Xiao-wen, ZHOU Wu-hua. Test on suction and strength of expansive soil in a desorption-absorption cycle of moisture[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(2): 207-209. (in Chinese) [6] 谢 云, 陈正汉, 孙树国, 等. 重塑膨胀土的三向膨胀力试验研究[J]. 岩土力学, 2007(8): 1636-1642. (XIE Yun, CHEN Zheng-han, SUN Shu-guo, et al. Test research on three-dimensional swelling pressure of remolded expansive clay[J]. Rock and Soil Mechanics, 2007(8): 1636-1642. (in Chinese)) [7] 孔令伟, 陈建斌, 郭爱国, 等. 大气作用下膨胀土边坡的现场响应试验研究[J]. 岩土工程学报, 2007, 29(7): 1065-1073. (KONG Ling-wei, CHEN Jian-bin, GUO Ai-guo, et al. Field response tests on expansive soil slopes under atmosphere[J]. Chinese Journal of Geotechnical Engineering. 2007, 29(7): 1065-1073. (in Chinese)) [8] 李雄威, 张鹤年, 张 勇. 膨胀土渗透性室内试验与非饱和渗透系数预测[J]. 四川建筑科学研究, 2011(5): 115-118. (LI Xiong-wei, ZHANG He-nian, ZHANG Yong. Lab test and unsaturated coefficient prediction of expansive soil permeability[J]. Sichuan Building Science, 2011(5): 115-118. (in Chinese)) [9] Van Genuchten M Th. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Sci Soc Am J, 1990, 44: 892-898.
