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降雨干湿循环作用下的渣土边坡稳定性 被引量:7

Stability of Construction Solid Waste Landfill Slope under Wetting-Drying Cycle of Rainfall
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摘要 降雨作用下边坡不同深度岩土体所经受的劣化作用强度差异显著,从而影响边坡的稳定性。以深圳典型渣土边坡为例,基于改进的Green-Ampt模型计算降雨作用下的浸润锋深度,通过干湿循环与直剪试验,获得了浸润锋内渣土抗剪强度参数的劣化规律,结合劣化规律并采用双强度折减法研究了不同降雨工况下渣土边坡的稳定性。研究结果表明:随着干湿循环次数的增加,渣土的黏聚力及内摩擦角均减小,且前期减小得快,后期缓慢,4次干湿循环后趋于稳定,符合指数函数的变化趋势,保持稳定不再衰减的渣土黏聚力为9.5kPa,内摩擦角为19°;综合降雨入渗的干湿循环以及双强度折减法得到的渣土边坡的稳定性系数较仅采用传统强度折减法得到的稳定性系数有大幅度的降低,最大减小了44.5%。该方法可以用于准确评价降雨作用下边坡稳定性。 Rock and soil masses at different depths of slopes suffer various deterioration of strength under rainfalls.Taking a typical construction solid waste landfill slope in Shenzhen as an example,this paper studies the deterioration law of shear strength parameters of soil from the slope obtained under different wetting-drying cycles through direct shear tests.The infiltration depth is calculated by using an improved Green-Ampt model,and the stability of the illustrated slope is estimated based upon deterioration law and double strength reduction method under different rainfall conditions.The results show that the cohesion and internal friction angle of the soil decrease with the wetting-drying process,both shear strength parameters reduce rapidly firstly and tend to be stable after four wetting-drying cycles.This conforms to the trend of the exponential function.The cohesion has a constant value of 9.5 kPa ultimately,while the internal friction angle reaches 19°.Compared to the result using conventional evaluation approaches,stability factor of the slope in the wetting-drying cycle of rainfall and nonuniform reduction of shear strength parameters has a greater reduction as much as 44.5%,respectively.The proposed method can be used to estimate the stability of slopes under rainfall accurately.
作者 熊爽 曾江波 姚文敏 李长冬 Xiong Shuang;Zeng Jiangbo;Yao Wenmin;Li Changdong(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Shenzhen Geotechnical Investigation & Surveying Institute Co.,Ltd.,Shenzhen Guangdong 518028,China)
出处 《地质科技情报》 CSCD 北大核心 2018年第5期240-246,共7页 Geological Science and Technology Information
基金 深圳市科技计划技术攻关项目(JSGG20160331154546471) 中国地质大学(武汉)大学生自主创新资助计划(1810491A23)
关键词 渣土边坡 GREEN-AMPT模型 浸润锋深度 干湿循环 双强度折减法 construction solid waste landfill slope Green-Ampt model infiltration depth wetting-drying cycle double strength reduction method
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