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非饱和重塑黏土渗透性试验研究

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：2267-2276
语言：中文
分类：TU411[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]大连理工大学海岸和近海工程国家重点实验室／土木水利学院／岩土工程研究所,大连116024, [2]大连民族学院土木建筑工程学院,大连116600, [3]安徽建筑工业学院土木工程学院,合肥230022
相关基金：国家自然科学基金资助项目（No.50679015）;大连民族学院青年教师基金项目（No.2006A205）.
相关项目：海洋土的工程特性及其地基的变形机理研究

关键词：渗透系数, 土-水特征曲线, 非饱和土, 含水率, permeability coefficient, soil-water characteristic curve, unsaturated soil, water content

中文摘要：

工程中常常遇到非饱和土渗流问题,其渗透性是非饱和土的重要研究内容。采用常规压力板仪详细研究了重塑黏土在3种不同击实功和5种不同击实含水率下的土-水特征曲线,并用变水头法测量了相应的饱和土渗透系数。结合土水曲线和饱和渗透系数,基于Van Genuchten模型和Fredlund模型,详细探讨了重塑非饱和重塑黏土在不同击实条件下的渗透性。结果表明,土样饱和渗透系数随着击实含水率的增大而减小,且随着基质吸力的增大土样渗透性差别逐渐减小。当试样吸力达到1 MPa时,可认为不同击实含水率下试样的渗透性基本相同;在轻型击实和简化轻型击实下,试样渗透性很相似。重型击实功下试样的渗透系数和轻型击实下土样渗透系数的比值kw（M）kw（S）随着吸力的增大而逐渐增大,在饱和状态时比值约为1/100,当吸力达到1 MPa时比值逐渐稳定在1/10右。

英文摘要：

Infiltration flow in unsaturated soils often occars in engineering;and unsaturated hydraulic conductivity is one of important topics of unsaturated soils.Using the pressure-plate extractor,the soil-water characteristic curves under different compactive water contents and different compactive efforts are obtained.The corresponding saturated permeability coefficient is gotten by the variable water level method.Combined with the soil-water characteristic curves and saturated permeability coefficient,based of Van Genuchten model and Fredlund model,permeability of remoulded unsaturated clay under different compactive conditions is discussed in detail.The results show that the permeability coefficient decreases with the increase of compactive water content;and the its difference reduces with the increase of suction;and permeability coefficient can be assumed identical when the suction reaches 1 MPa.The permeability coefficient of samples compacted with standard Proctor compactive efforts and reduced Proctor comp active efforts are very similar.The value of kw（M） kw（S） is about 0.01 in saturated state,and increases with the suction increases.When the suction reaches 1 MPa,the value becomes 0.1 gradually.

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