摘要
采用5种土壤质量含水率(0.05,0.08,0.10,0.12,0.15)水平,进行浅层滑坡体不同层次土壤在不同含水率条件下的不固结不排水剪切试验。试验表明,浅层滑坡体不同层次土壤抗剪强度与土壤含水率密切相关。土壤含水率对浅层滑坡体A层、B层和C层土壤抗剪强度指标的影响呈现出相同的规律。A层、B层和C层土壤黏聚力均随着土壤含水率的增加基本呈先增大后减小的趋势,在土壤含水率为0.10左右时土壤黏聚力达到其最大值,在相同土壤含水率条件下,土壤黏聚力的分布规律为C层>B层>A层。A层、B层和C层土壤内摩擦角随着土壤含水率的增加近似呈线性减小,在相同土壤含水率条件下,土壤内摩擦角的分布规律为C层>B层>A层,但就随土壤含水率的增加,土壤内摩擦角减小的速率而言,呈现出B层>A层>C层的规律。消除和减轻地表水的危害是我国西南丘陵山地滑坡灾害防治的重要环节。
The triaxial shearing test under unconsolidated-undrained condition was carried out in laboratory with five soil water content（W/W）of 0.05,0.08,0.10,0.12,0.15 for different soil layer of shallow landslide. Experimental data indicated that there was close relation between soil water content and soil shearing strength. Effects of soil water content on soil shearing strength was similar to different soil layer of shallow landslide. Soil cohesive force firstly increased and then decreased with the increasing of soil water content,and it reached to the maximum at the water content of about 0.10. There was Clayer〉B layer〉A layer about soil cohesive force under same soil water content. Soil internal frictional angle decreased linearly with the increasing of soil water content to different soil layer of shallow landslide and there was C layer〉B layer〉A layer about soil internal frictional angle under same soil water content,but there was B layer〉A layer〉C layer about the decreasing rate of soil internal frictional angle with the increasing of soil water content. It was the key to fathering landslide that the damage of surface water was eliminated or lightened.
出处
《水土保持学报》
CSCD
北大核心
2009年第6期48-50,共3页
Journal of Soil and Water Conservation
基金
国家科技支撑计划课题(2006BAC01A16
2007BAD87B10)
国家自然科学基金项目(40701093)
关键词
土壤含水率
土壤抗剪强度
抗剪强度指标
浅层滑坡体
soil water content
soil shearing strength
shearing strength parameter
shallow landslide
作者简介
倪九派（1976-），博士，副教授，湖北孝感人，主要从事水土保持、地理信息系统及土地资源管理与利用等方面的研究。E-mail：nijiupai@163．com
通讯作者：谢德体（1957-），男，博士，教授，主要从事土壤肥力与生态、农业生态环境恢复与重建及土地资源管理与利用等方面的研究。E-mail：xdt@swu．edu．cn
