土样类型对非饱和土壤热湿迁移的影响研究
发布时间：2018-09-05 05:50
【摘要】：为研究不同土样类型对土壤热湿迁移规律的影响,搭建了一维土柱实验台,选取砾砂、粗砂、中砂、细砂、粉砂、黏土6种土样类型作为研究对象,分别进行了热湿迁移规律的实验研究。实验结果表明:在初始含水率为5%、热源温度为30℃、击实功为20J实验工况下,6种土样在加热过程中热迁移表现出差异性,粉砂、细砂和黏土热迁移效果最佳,砾砂和粗砂次之,中砂热迁移效果最差。在热影响半径内,土体中热量的传导与含水率的传递相互作用,互为驱动:愈靠近热源,温度梯度愈成为水分在土样中运移的主要驱动力;愈远离热源,湿度梯度愈成为温度传导的主要驱动力。得到的不同土样类型在热湿迁移规律上的差异性及非饱和土样热湿迁移驱动机理可以为解决工程中所遇到的不同土质热湿迁移问题提供一定的参考依据。
[Abstract]:In order to study the effect of different soil sample types on soil heat and moisture migration, a one-dimensional soil column test bench was set up. Six types of soil samples, gravel, coarse sand, medium sand, fine sand, silt and clay, were selected as research objects. The experimental study on the laws of heat and moisture transfer was carried out respectively. The experimental results show that under the conditions of initial moisture content of 5, heat source temperature of 30 鈩，
本文编号：2223386
[Abstract]:In order to study the effect of different soil sample types on soil heat and moisture migration, a one-dimensional soil column test bench was set up. Six types of soil samples, gravel, coarse sand, medium sand, fine sand, silt and clay, were selected as research objects. The experimental study on the laws of heat and moisture transfer was carried out respectively. The experimental results show that under the conditions of initial moisture content of 5, heat source temperature of 30 鈩，
本文编号：2223386
本文链接：https://www.wllwen.com/kejilunwen/nykj/2223386.html
