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不同溶液环境下砂岩干湿循环损伤特性试验研究
Experimental study on damage characteristics of sandstone wet and dry cycle under different solution environments
投稿时间:2018-08-10  修订日期:2018-09-18
DOI:
中文关键词:  干湿循环  长石砂岩  结晶应力  损伤
英文关键词:dry-wet cycle  feldspar sandstone  crystallized stress  damage
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王来贵 辽宁工程技术大学 243515604@qq.com 
丁盛鹏 辽宁工程技术大学  
安文博 辽宁工程技术大学  
陈强 辽宁工程技术大学  
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中文摘要:
      为研究不同溶液环境下长石砂岩干湿循环损伤特性,对长石砂岩分别进行水和Na2SO4溶液两种环境下的干湿循环实验。对不同干湿循环次数后长石砂岩进行纵波波速测定、XRD衍射实验、单轴抗压实验以及数字散斑实验(DSCM)。结果表明:Na2SO4溶液环境下干湿循环长石砂岩纵波波速、抗压强度、弹性模量等物理力学参数下降更严重。干湿循环过程中水主要起溶解砂岩内部长石等矿物作用,盐分结晶产生结晶应力是长石砂岩损伤的主要原因。将应变局部化阶段初始点损伤状态确定为基准损伤,基于侧面应变标准差定义了长石砂岩损伤度,该损伤度演化方程能较好反映长石砂岩干湿循环损伤过程。
英文摘要:
      In order to study the characteristics of dry-wet cycle damage of feldspar sandstone under different solution environments, dry and wet cycle experiments of feldspar sandstone were carried out under water and Na2SO4 solution. Longitudinal wave velocity measurement, XRD diffraction experiment, uniaxial compression test and digital speckle correlation method experiment (DSCM) were performed on feldspar sandstone after different wet and dry cycles. The results show that the physical mechanics parameters such as the longitudinal wave velocity, compressive strength and elastic modulus of the dry-wet feldspar sandstone in the Na2SO4 solution environment decline seriously., the mineral such as feldspar in the sandstone was dissolved by water during the dry-wet cycle and the crystallized stress generated by salt crystallization is the main cause of the damage of feldspar sandstone. The initial point damage state of strain localization stage was determined as the reference damage. The feldspar sandstone damage degree is defined based on the lateral strain standard deviation. The wet and dry cycle damage process of feldspar sandstone was reflected by the damage degree evolution equation.
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