温度梯度下压实黏土的水热迁移规律和渗透特性

发布时间：2018-06-16 03:49

本文选题：压实黏土 + 温度梯度　；参考：《东北大学学报(自然科学版)》2017年06期

【摘要】：开展了室内压实黏土体模型柱试验,研究了温度梯度作用对压实黏土水热迁移和渗透性的响应规律.结果表明:热量在黏土柱下部比黏土柱上部传输快,温度的升高随离热源距离的增加而明显延迟;底部热源促使压实黏土柱产生温度梯度,进而促使水汽在黏土柱内由底向上迁移,造成水分损失较快;随热源的持续作用,黏土柱内温度梯度逐渐下降,水汽迁移速率减小,含水率下降缓慢并趋于稳定.热源持续作用使土柱上表面开裂程度明显大于下底面,用示踪剂来粗略测量裂缝深度是可行的.温度梯度作用不同程度地增大了黏土体的渗透系数,且黏土柱的两端渗透系数增加较快,中间部分增大倍数次之.
[Abstract]:Laboratory compacted clay model column tests were carried out to study the response of temperature gradient to the hydrothermal migration and permeability of compacted clay. The results show that the heat transfer in the lower part of the clay column is faster than that in the upper part of the clay column, the increase of temperature is delayed with the increase of distance from the heat source, and the temperature gradient of the compacted clay column is induced by the bottom heat source. As a result, water vapor migrates from bottom to top in clay column, which results in fast water loss. With the continuous action of heat source, the temperature gradient in clay column decreases gradually, the water vapor migration rate decreases, and the water content decreases slowly and tends to stabilize. The cracking degree of the upper surface of the soil column is obviously greater than that of the bottom surface due to the continuous heat source. It is feasible to use tracer to roughly measure the crack depth. The temperature gradient increases the permeability coefficient of clay to varying degrees, and the permeability coefficient of the two ends of the clay column increases rapidly, followed by the increase multiple of the middle part.
【作者单位】：东南大学交通学院;武汉轻工大学土木工程与建筑学院;
【基金】：国家自然科学基金资助项目(51279032) 国家“十二五”科技支撑计划项目(2012BAJ01B02) 中央高校基本科研业务费专项资金江苏省普通高校研究生科研创新计划资助项目(KYLX_0147)
【分类号】：TU442

【相似文献】