辽西风积土动力特性实验研究  

Experimental Study of Dynamic Characteristics for Aeolian Soil in West Liaoning Province

作　　者：张向东[1] 冯胜洋[1] 王长江 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000 [2]中铁九局集团有限责任公司,辽宁沈阳110013

出　　处：《实验力学》2012年第2期165-170,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目"高速铁路风积土路基的振(震)陷变形试验研究"(编号:5097813);辽宁省高等校优秀人才支持计划项目"风积土冻胀与融沉特性及工程防治措施的研究"(编号:2008RC23)资助

摘　　要：通过一系列动态三轴实验,研究了原状饱和辽西风积土在不同固结压力条件下的动态强度、动态弹性模量和阻尼比。结果表明,辽西风积土的破坏动态强度随着固结围压和固结应力比的增大而增大,而动态剪切强度明显区别于静态剪强度;其动态弹模量随着固结应力比和固结围压的增加而增加,而阻尼比随着固结应力比和固结围压的增大而减小。同时,分别拟合得到最大动态弹模量和最大阻尼比与有效固结应力的关系式,并且对动态弹模量和阻尼比进行了归一化处理。Through a series of dynamic triaxial tests, the dynamic strength, the dynamic elastic modulus and damping ratio of saturated original aeolian soil form west Liaoning Province were studied under different consolidation pressure conditions. Results indicate that the failure dynamic strength of aeolian soil increases along with the ambient consolidation pressure and consolidation stress ratio increasing, and the dynamic shearing strength is obviously different from the static one; its dynamic elastic modulus increases along with the consolidation stress ratio and ambient consolidation pressure increasing, but the damping ratio change presents an opposite trend. Meanwhile, equations describing the relation of the maximum dynamic elastic modulus and the maximum damping ratio with the effective consolidation stress were fitted respectively, and dynamic elastic modulus and damping ratio were normalized.

关 键 词：辽西风积土 动态强度 动弹模量 阻尼比 

分 类 号：TU435[建筑科学—岩土工程]