高液限土和煤系土抗剪强度的水敏感性比较研究  

Comparative Study on the Water Sensitivity of Shear Strength of High Liquid Limit Soil and Coal-bearing Soil

作　　者：胡昕[1] 洪宝宁[2,3] 王海明[2,3] 杜强[2,3] 

机构地区：[1]中国电力工程顾问集团西北电力设计院,陕西西安710075 [2]河海大学岩土力学与堤防工程教育部重点实验室,江苏南京210098 [3]河海大学岩土工程研究所,江苏南京210098

出　　处：《四川大学学报（工程科学版）》2010年第1期54-59,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50279008);广东省交通厅科技项目(2002-06);江苏省交通科学研究计划资助项目(04Y006);盐城市科技发展计划资助项目(YKJ2004002)

摘　　要：为研究分布在广梧高速公路沿线的高液限土和煤系土的水敏感性,通过常规直接剪切试验测定了不同含水状态高液限土和煤系土试样的抗剪强度,对比分析了含水量对两者抗剪强度的影响,并探讨了实际工程中应对高液限土和煤系土问题的策略。研究结果表明:高液限土和煤系土的抗剪强度均与起始含水量具有明显的相关关系,起始含水量越大抗剪强度越小。随着含水量的增大,高液限土黏聚力的对数与含水量成线性关系减小,其内摩擦角则先小幅减小,后急剧减小。随着含水量的增大,煤系土黏聚力变化具有显著的分段性:先小幅减小,后大幅减小,且其对数与含水量成指数关系。含水量变化对煤系土内摩擦角的影响较小。粒组成分的不同是导致高液限土和煤系土水敏感性不同的主要原因。In order to study the water sensitivity of high liquid limit soil and coal-bearing soil which ranges along with Guangwu Highway, their shear strength were measured through direct shear test, the influence of water contents on the shear strength of coal-bearing soil was comparatively analyzed and some strategies for treeting the high liquid limit soil and coal-bearing soil were discussed. The results indicated that the shear strength and initial water content of high liquid limit soil and coaL-bearing soil have marked correlationship and the bigger their initial water content, the smaller their shear strength. With water content increasing, the interrelationship between the logarithm of cohesion of high liquid limit soil and its water content is linear, while its internal friction angle firstly declines by small margin and then sharply declines. With water content increasing, the changing trend of cohesion of coal-bearing soil is of marked characteristic of stage： when water content of coal-bearing soil is under some value, its cohesion changes in small ranges ; after water content of coal-bearing soil is over the value, its cohesion decreases with water content increasing and the interrelationship between the logarithm of its cohesion and water content is linear. Water content of coal-bearing soil has no marked effect on its internal friction angle. High liquid limit soil and coal-bearing soil have different water sensitivity mainly because of the difference of their gain size composition.

关 键 词：道路工程 特殊土 直剪试验 水敏感性 剪切强度 

分 类 号：TU411.7[建筑科学—岩土工程] TU443[建筑科学—土工工程]