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氯盐干湿循环耦合作用下水泥土的力学性能
Mechanical Properties of Cement Soil Subject to Coupling Effect of Chloride Salt Solution and Dry Wet Cycles
投稿时间:2020-01-01  修订日期:2020-02-11
DOI:103969/j.issn.1007 9629202103009
中文关键词:  水泥土  氯盐  干湿循环  应力应变曲线  微观结构
英文关键词:cement soil  chloride salt  dry wet cycle  stress strain curve  microstructure
基金项目:安徽省高校自然科学研究重点项目(KJ2015A135)
              
作者单位
张经双
ZHANG Jingshuang
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001
Engineering Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
段雪雷
DUAN Xuelei
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001
Engineering Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
吴倩云
WU Qianyun
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001
Engineering Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
刘永翔
LIU Yongxiang
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001
Engineering Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
夏香港
XIA Xianggang
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001
Engineering Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
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中文摘要:
      为研究氯盐干湿循环耦合作用下水泥土的力学性能,针对纤维改良水泥黏土进行无侧限抗压强度、超声波检测、扫描电镜(SEM)及X射线衍射(XRD)试验,分析了水泥土质量损失率、相对波速、峰值应力、残余应力、变形模量的变化规律和微观结构特征.结果表明:随着氯盐质量浓度和干湿循环次数的增加,水泥土的内部微观结构更加疏松,质量损失率增大,纵波波速下降;在氯盐干湿循环耦合作用下,水泥土的应力应变曲线存在压密阶段、弹塑性阶段、破坏阶段和残余阶段;水泥土的峰值应力和残余应力均符合指数函数下降规律,在清水、45、180、300g/L NaCl溶液中经历28次干湿循环后,水泥土的峰值应力、残余应力和变形模量分别下降4879%、5771%和4933%,5263%、4876%和5437%,5688%、5970%和5750%,5789%、5771%和6567%,水泥土破坏后的残余应力为峰值应力的20%~40%.
英文摘要:
      In order to study the mechanical properties of cement soil subjected to the coupling effect of chloride salt solution and dry wet cycles, unconfined compression test, ultrasonic test, scanning electron microscope(SEM) test and X ray diffraction(XRD) test were performed. The change rules of mass loss rate, relative wave velocity, peak stress, residual stress, deformation modulus and microstructure characteristics of cement soil were investigated. The results show that with increasing chloride salt concentration and the number of dry wet cycles, the internal microstructure of cement soil becomes more loose, and the mass loss rate increases, but the P wave velocity decreases. The stress strain curve of cement soil subjected to the coupling effect of chloride salt and dry wet cycles can be divided into compaction phase, elastic plastic phase, failure phase and residual phase. The peak stress and residual stress of cement soil comply with the exponential decline law. Compared with those before the wet dry cycle, the peak stress, residual stress and deformation modulus subjected to 28 wet dry cycles in water, 45, 180, 300g/L NaCl solutions decrease by 4879%, 5771% and 4933%, 5263%, 4876% and 5437%, 5688%, 5970% and 575%, 5789%, 5771% and 6567%, respectively. And the residual stress is 20%40% of the peak stress.
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