正融土无侧限抗压试验研究  

Unconfined compression tests on thawing soil

作　　者：彭丽云[1] 刘建坤[1] 田亚护[1] 钱春香[1] 

机构地区：[1]北京交通大学土木工程学院,北京100004

出　　处：《岩土工程学报》2008年第9期1338-1342,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50678020);教育部新世纪优秀人才计划项目(NCET-05-0092)

摘　　要：采用SLB-1型应力应变三轴仪,对正融土进行了无侧限抗压试验,研究了冻前含水率、顶端冷却温度和顶端融化温度对土样的应力应变和强度特性的影响。试验结果表明:①在相同顶端冷却温度和相同顶端融化温度下,最优含水率下制备的土样具有最高的强度,且正融土样破坏时的强度和冻前含水率之间的关系可以用高次多项式来描述;②在相同冻前含水率和相同顶端融化温度下,土样破坏时的强度随顶端冷却温度的降低而增大,破坏时的应变也增加;③在相同顶端冷却温度下,高含水率土样在较大的应变下出现破坏;低含水率土样在较小的应变下出现破坏;④文中给出的正融土样的无侧限抗压应力应变关系表达式和试验数据吻合很好,可以在实际工程中加以推广应用。Through the unconfined compression tests on a thawing soil using an SLB-1 triaxial apparatus, the strength and stress-strain behaviors were analyzed, considering the influence of water content, cooling temperature and thawing temperature on the top of samples. The following conclusions could be drawn： ① Thawing soil with the optimum water content had the highest strength under the same cooling and thawing temperature. A high-order polynomial relationship was found between the strength and water content, which could be used to predict the strength of thawing soil. ② Under the same water content and thawing temperature, the decrease in cooling temperature would increase the strength and strain at failure. ③ At the same cooling temperature, the soil with high water content failed at large strain; the soil with low water content failed at small strains. ④ An empirical model was deduced for describing the stress-strain relationship, showing good agreement with the test data.

关 键 词：正融土 无侧限抗压强度 含水率 应力应变关系 

分 类 号：TU411[建筑科学—岩土工程]