重庆地区红层泥岩侧限膨胀性能试验研究  

Experimental Study on Confined Swelling Characteristic of Redbed Mudstone in Chongqing

作　　者：胡文静[1] 丁瑜[1,2] 夏振尧[1,2] 朱朝辉[1] 袁可辉 王圆发 向玄[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002

出　　处：《防灾减灾工程学报》2015年第5期607-611,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(41002100;41202250);湖北省教育厅优秀中青年科技创新团队计划项目(T201304);三峡大学研究生科研创新基金项目(2014CX018)资助

摘　　要：以重庆地区侏罗系中统沙溪庙组红层泥岩为研究对象,通过侧限无荷膨胀和有荷膨胀室内试验,研究了侧限无荷、有荷及不同加水条件下的膨胀性能。结果表明,红层泥岩侧限无荷膨胀呈现3个膨胀变形阶段,第1阶段膨胀变形较快,膨胀量较大,第2阶段膨胀具有增速特征,95%的膨胀量在前2个阶段完成;竖向荷载对红层泥岩侧限膨胀变形的抑制作用明显,随着竖向荷载的增大,侧限有荷膨胀率急剧降低;侧限无荷条件下,短时间内,初期的水量大小对泥岩膨胀性能影响不明显,但随着时间持续,水量大小对稳定膨胀量、膨胀变形过程及其特征起着控制作用。In this paper,by means of confined free swelling test and confined swelling test under loads,redbed mudstone of Shaximiao group in the Middle Jurassic in Chongqing area is present to study its swelling characteristics under confined free and loading conditions,and swelling under different water injections as well.Results reveal that three phases are present in the confined free swelling of mudstone,fast swelling deformation and high swelling increasment in the first phase and increasing swelling velocity in the second phase.95 percent swelling occurs in the former two phases.It is found that vertical loads greatly restrain the confined swelling of mudstone.The confined loading swelling ratios decrease sharply with the increasing vertical loads.Moreover,the amount of water has no obvious effect on swelling characteristic of red bed mudstone within a short time under confined without load,but it plays a controlling role on the stable swelling capacities,swelling processes and characteristics as time lapsing.

关 键 词：红层 泥岩 室内试验 膨胀性能 

分 类 号：TU454[建筑科学—岩土工程]