水泥砂浆桩无侧限抗压强度试验研究  

Experimental study on unconfined compressive strength of cement mortar pile

作　　者：隋瑞凌 阮波[2] 李雪松[2] 

机构地区：[1]中铁二十五局集团第二工程有限公司,湖南衡阳421002 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2015年第3期540-544,共5页Journal of Railway Science and Engineering

基　　金：中南大学实验室开放专项资金资助项目

摘　　要：通过水泥砂浆桩无侧限抗压强度室内配比试验，研究不同水泥掺入比、不同掺砂量及不同龄期条件下水泥砂浆桩的无侧限抗压强度发展规律。试验研究表明：水泥土中掺入一定量的砂，可以明显地提高水泥砂浆桩的无侧限抗压强度。水泥掺入比相同时，28 d 龄期的水泥砂浆桩的无侧限抗压强度为水泥土的2．2～3．7倍；水泥砂浆桩的无侧限抗压强度随着掺砂量的增加而增大，当掺砂量达到30％以后，强度随着掺砂量的增大而减小。水泥砂浆桩无侧限抗压强度随着水泥掺入比的增大而增大，随着养护龄期的增长而增大，其中前期的强度增长速率较快，后期较慢。水泥掺入比低、掺砂量低、龄期短的试件试件呈现塑性破坏，水泥掺入比高、掺砂量高、龄期长的呈现脆性破坏。本文的研究成果可为工程应用提供试验数据和理论依据。Through unconfined compressive strength （UCS）test of cement mortar pile in laboratory,its develop-ment rules in different sand contents,different cement contents and different curing ages are studied.The experi-mental results indicate that the mixing with a certain amount of sand can significantly increase the strength of ce-ment mortar pile under a certain cement content condition.When the cement content is same,the UCS of cement mortar pile is 2.2 ~3.7 times than the UCS of cement stabilized soil when the curing age is 28 days.The UCS of cement mortar pile increases significantly with the increase of sand content,however,the strength of the speci-mens decreases after sand content is 30%.The results indicate that with the increase of curing period and cement ratio,the strength of the specimens increase significantly.Nevertheless,the decrease rate of UCS resulted from the increase of curing days.The deformation modulus of cement mortar pile increases with the growth of UCS. Plastic fracture could be described fracture characteristics of the specimen with low sand content;low cement ra-tio and short curing days.At the same time,the fracture characteristics of the specimen with high sand content, high cement ratio and long curing days.The result provides test data and theoretical basis for the practical appli-cation of engineering.

关 键 词：水泥砂浆桩 无侧限抗压强度 水泥掺入比 掺砂量 龄期 破坏模式 

分 类 号：TU411.7[建筑科学—岩土工程]