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王 维, 顾 峰, 何 刘, 刘 钊, 曹 廷, 李国庆.水岩循环作用下变质砂岩力学参数劣化试验研究水资源与水工程学报[J].,2022,33(2):179-185
水岩循环作用下变质砂岩力学参数劣化试验研究
Experimental study on deteriorating characteristics of metamorphic sandstone mechanical parameters under the effect of wetting-drying cycles
  
DOI:10.11705/j.issn.1672-643X.2022.02.24
中文关键词:  变质砂岩  水岩循环  力学性能  劣化规律  回归模型
英文关键词:metamorphic sandstone  wetting-drying cycle  mechanical parameter  deterioration pattern  regression model
基金项目:中国电建集团成都勘测设计研究院有限公司科研项目(P39718)
作者单位
王 维1, 顾 峰1, 何 刘2, 刘 钊1, 曹 廷1, 李国庆1 (1.中国电建集团成都勘测设计研究院有限公司 四川 成都 6100722.西南交通大学 地球科学与环境工程学院 四川 成都 611756) 
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中文摘要:
      为研究水岩循环对变质砂岩力学参数的影响,基于室内岩石水岩循环试验,对岩石主要力学参数在水岩循环过程中的弱化特性及弱化机理进行了研究。结果表明:水岩循环次数与岩石单轴抗压强度、抗拉强度、弹性模量、黏聚力以及内摩擦角的变化呈负相关关系,与泊松比的变化呈正相关关系;水岩循环初始阶段各项力学参数的变化速率较快,但随着循环次数的增加最终趋于平缓。经过对28次水岩循环后岩石各项力学参数的劣化度D值分析认为,水岩循环对各项力学参数的敏感度为:泊松比>抗拉强度>黏聚力>弹性模量>内摩擦角>单轴抗压强度。通过对水岩循环过程中岩石微观结构变化的分析表明,易水解矿物的溶蚀耗散、溶蚀裂隙的扩展延伸、溶蚀碎屑颗粒脱落等效应,是本试验岩石力学损伤的主要原因。利用回归分析建立了力学参数随循环次数变化的回归模型,并验证了其可靠性,基于试验结果及模型分析认为,经过16次水岩循环以后的岩石力学参数趋于平稳,因此选用16次水岩循环后的岩石力学参数进行工程设计是较为可靠的。
英文摘要:
      In order to study the influence of wetting-drying cycles on the mechanical parameters of metamorphic sandstone, the deteriorating characteristics and mechanism of major rock mechanical parameters in the process of wetting-drying cycles were studied by laboratory test. The results demonstrate that the number of cycles is negatively correlated with the changes of uniaxial compressive strength, elastic modulus, tensile strength, cohesion and internal friction angle, but positively correlated with the changes of Poisson’s ratio; in the initial stage of the cycles, the change rate of each mechanical parameter is fast, but it stabilizes with the increase of the cycles. According to the analysis of the deteriorating degree D after 28 cycles, the sensitivity degree of wetting-drying cycles to various mechanical parameters is as follows: Poisson’s ratio>tensile strength>cohesion>elastic modulus>internal friction angle>compressive strength. The analysis of rock microstructure changes in the process of the wetting-drying cycles show that the main causes of rock mechanical damage in this experiment are the dissolution dissipation of easily hydrolyzed minerals, the expansion of dissolution fissures and the shedding of dissolution debris particles. The regression model of mechanical parameters that change with the number of cycles was established, and its reliability was verified. Based on the test results and model analysis, it is believed that the rock mechanical parameters tend to stabilize after 16 cycles, so this number of cycles is recommended for the selection of mechanical parameters in engineering design.
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