岩土工程学报2012，Vol.34Issue(1)：65-74,10.
兰州地区大厚度自重湿陷性黄土场地浸水试验综合观测研究
Comprehensive soaking tests on self-weight collapse loess with heavy section in Lanzhou region
摘要
Abstract
Soaking tests on self-weight collapse Q3 loess with heavy section located in Lanzhou region are conducted without water injection hole and with moisture meter and heat conduction suction probe embedded. The test results indicate that multiple collapses appear in different soil layers at different depths, and the times of the collapses decrease with the increase of loess depth. The volumetric water content at different depths has different rules： the curve above 10 m in depth is made up of 6 stages, that between 10 m and 22.5 m in depth has 5 stages, and that beneath 22.5 m in depth has 3 stages. The water above 25 m in depth infiltrates easily, and the water beneath 25 m in depth infiltrates slowly because the upper loess has collapsibility inducing the compaction and air pressure among soil pores increases gradually. The cracks far from the test pit are generated by the violent motion of the cracks near the test pit. The wetting front of the self-weight collapse loess with heavy section takes the shape of an ellipse （the major axis is horizontal）, and finally the eccentricity of elliptical humidification area becomes less. The soggy angle increases with the increasing supply of water source, and its variation range is 0° -55 ° . The vertical infiltration velocity presents the reduction tendency of power function.关键词
大厚度自重湿陷性黄土/浸水试验/体积含水率/吸力/渗透/浸润角Key words
self-weight collapse loess with heavy section/soaking test/volumetric water content/matric suction/infiltration/soggy angle分类
建筑与水利引用本文复制引用
姚志华,黄雪峰,陈正汉,张建华..兰州地区大厚度自重湿陷性黄土场地浸水试验综合观测研究[J].岩土工程学报,2012,34(1):65-74,10.基金项目
国家自然科学基金项目(11072265) （11072265）
国家电网公司科学技术项目(SGKJJSKF[2008]656) （SGKJJSKF[2008]656）
重庆市科委自然科学基金项目(2009BB6174) （2009BB6174）
