摘要
膨胀土浸水产生膨胀变形,当膨胀变形受到约束时,必然产生较大的膨胀力。已有研究成果表明膨胀力的大小与土体的初始含水量以及干密度密切相关。为进一步了解膨胀土的膨胀力发展规律,根据不同初始含水量和干密度共配制了40个试样,采用恒体积试验法研究了南阳膨胀土的膨胀力特性。试验结果表明了膨胀力的对数与初始含水量以及干密度之间满足线性关系,进而得到了它们之间的关系式,同时依据已有膨胀率与上覆荷载的关系,建立了上覆荷载作用下的膨胀力计算公式。最后,通过预测值和试验结果的对比验证了该关系式能够较好地预测南阳膨胀土的膨胀力,为膨胀土地区的结构稳定分析提供了参考。
The swelling force is generated in the case of swelling deformation caused by that when moistening is constrained. Many researches have verified that the swelling force is significantly related to the initial water content and dry density. In order to further understand the development of the swelling force, the constant volume test method was adopted to measure the swell- ing force of 40 expansive samples which were made according to the different initial water content and dry density. It is found from the experiment that logarithm of the swelling pressure is linear with the initial water content and dry density. The function of relationship between them was obtained. Moreover, on the base of relationship between swelling quantity and applied pressure which has been studied, the calculation method of swelling pressure considering vertical pressure was proposed. At last, the pro- posed function was verified by the comparison between predict values and experimental values. In general, the results of this study can provide an instruction to the stability analysis of structures in＇ the regions of expansive soils widely distributed.
出处
《南水北调与水利科技》
CAS
CSCD
2011年第5期11-14,共4页
South-to-North Water Transfers and Water Science & Technology
基金
江苏省基础研究计划(自然科学基金)(BK2009344)
江苏高校优势学科建设工程资助项目
中央高校基本科研业务费(2010B20114)
关键词
膨胀土
浸水
膨胀变形
约束
膨胀力试验
初始含水量
干密度
expansive soils
moistening
swelling deformation
constrain
swelling force test
initial water content
dry density
