摘要
通过“水气置换法”制备了重塑含气砂土,开展了一系列固结不排水剪切试验,对比了饱和砂与含气砂在不同固结条件下的单调及循环剪切特性。试验结果表明:正常固结条件下,含气砂抗剪强度随含气量的增加而增大,表现出更为显著的剪胀特性和应变硬化趋势,其临界状态应力比相较于饱和砂有所增大。对于超固结砂土,其抗剪强度随含气量的增加而减小,此时气体的存在减弱了土体强度随超固结比的增长趋势;同时,含气砂动强度随超固结比的提高而下降。
A series of undrained monotonic and cyclic triaxial tests are carried out to compare the shear behaviors of the gas-bearing and saturated sand under varying consolidation conditions.The results show that under the normal consolidation conditions,the shear strength of the gas-bearing sand increases with the gas content,exhibiting a more significant dilatancy characteristic and strain-hardening tendency,and its critical state stress ratio is higher than that of the saturated sand.For the over-consolidated sand,its shear strength decreases with the gas content.It indicates that the presence of gas weakens the increasing trend of soil strength with the over-consolidation ratio.In the meanwhile,the cyclic shear resistance of the gas-bearing sand decreases with the increasing over-consolidation ratio.
作者
孙淼军
施周桓
周波翰
潘坤
SUN Miaojun;SHI Zhouhuan;ZHOU Bohan;PAN Kun(POWERCHINA Huadong Engineering Corporation Limited,Hangzhou 311122,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第S02期165-170,共6页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划项目(2023YFB2604200)
国家自然科学基金项目(U2239251,52178362)。
关键词
含气砂土
不排水
单调剪切
循环加载
超固结
gas-bearing sand
undrained condition
monotonic shear
cyclic loading
over consolidation
