气候影响下膨胀土工程性质的原位响应特征试验研究  

Field response characteristic test of expansive soil engineering behavior under effect of atmosphere

作　　者：李雄威[1,2] 孔令伟[1] 郭爱国[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]常州工学院土木建筑工程学院,江苏常州213002

出　　处：《岩土力学》2009年第7期2069-2074,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No10872210);交通部西部交通建设科技项目(No200631878530);岩土力学与工程国家重点实验室资助项目(NoSKLZ0803)

摘　　要：以广西膨胀土为研究对象,考虑气象因素的影响,通过现场试验对膨胀土的胀缩变形、变形模量与渗透特性进行了原位跟踪测试。结果表明,较小的降雨量就可以使表层土体的含水率和膨胀状态达到极限。对降雨过程而言,自然状态下膨胀土雨水入渗的影响深度是有限的;膨胀土变形模量随含水率的增加以幂函数的形式逐渐降低;当含水率较低、裂隙较发育时,土体的渗透性会大大提高,而植被的存在也会较大幅度地改善土体渗透性,为深入认识膨胀土边坡的灾变机制提供了依据。The swelling-shrinking deformation, deformation modulus and permeability of expansive soil are tracked and measured in Nanning, Guangxi considering the effect of atmosphere. The test results are just as follows. Firstly, a low rainfall may lead water content and swelling state to the limit value, and the influence depth of infiltration is finite while raining. Secondly, the deformation modulus is decreased with the increase of water content following the forms of power function. Finally, when the water content is low, the fissure is developed and the permeability is improved greatly; meanwhile, the permeability is also strengthened with the vegetation covered, which is useful to recognize the disastrous mechanism of exoansive soil slope.

关 键 词：膨胀土 胀缩性 模量 渗透性 植被 

分 类 号：TU443[建筑科学—岩土工程]