文献类型：期刊文献

中文题名：法向应力作用下砂岩错位裂隙变形行为研究

英文题名：Deformation behavior of dislocated sandstone fractures subject to normal stresses

作者：李博[1];崔逍峰[1];莫洋洋[1];邹良超[2];伍法权[1]

机构：[1]绍兴文理学院岩石力学与地质灾害浙江省重点实验室,浙江绍兴312000;[2]瑞典皇家理工学院可持续发展与环境工程系,瑞典斯德哥尔摩

年份：2021

卷号：42

期号：7

起止页码：1850

中文期刊名：岩土力学

外文期刊名：Rock and Soil Mechanics

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20213310785571)、Scopus、北大核心、CSCD、北大核心2020

基金：浙江省自然科学基金资助项目(No.LR19E090001);国家自然科学基金资助项目(No.42011530122,No.42077252)。

语种：中文

中文关键词：岩石裂隙;法向应力;法向位移;错位;弹塑性接触

外文关键词：rock fracture;normal stress;normal displacement;dislocation;elastic-plastic contact

中文摘要：受地质活动影响,天然裂隙往往存在不同程度的变形错位,对此类裂隙在法向应力作用下的变形行为尚缺乏定量的描述和评价,文献中经典裂隙变形模型的适用性尚未得到试验和数值模拟的验证。通过法向加载试验和弹塑性接触数值计算研究了具有不同错位的砂岩裂隙在法向应力作用下的变形破坏行为。采用经典的双曲线模型、统一指数模型和对数模型拟合了应力-位移曲线,确定了模型中参数的变化规律。结果表明:试验得到的应力-位移曲线与塑性破坏区域与数值计算结果基本吻合,验证了自主开发的弹塑性接触计算程序的可靠性;双曲线模型和对数模型在应力水平较小的阶段与数值计算结果存在较大偏离,而统一指数模型通过引入系数n,能够较好地匹配整个加载过程中的应力-位移关系;模型中的最大闭合量Vmax与裂隙最大开度正相关,初始法向刚度K_(ni)与岩石弹性模量正相关,与裂隙表面粗糙度和错位率负相关,系数n与裂隙表面粗糙度和错位率正相关;基于上述规律建立了针对V_(max)、K_(ni)和n的预测公式,预测结果与试验结果吻合良好。

外文摘要：Subject to geological processes,natural rock fractures can be dislocated to some extent,and the normal deformation behavior of such dislocated fractures has not been quantitatively estimated,and the applicability of classic deformation models has not been verified against experiments and numerical simulations.The deformation and failure behavior of dislocated sandstone fractures were studied via compression tests and elastic-plastic contact simulations.The obtained stress-displacement curves were fitted by a hyperbolic model,an exponential model and a logarithmic model,respectively and the coefficients involved in these models were estimated.The results show that the experimentally and numerically obtained stress-displacement curves agree well with each other,and the surface damage areas are also consistent,which verified the reliability of the elastic-plastic contact model.The hyperbolic and logarithmic models do not fit the curves well under relatively low stress levels,while the exponential model well accommodates the simulation results in the whole loading process by introducing a coefficient n.The maximum closure V_(max) is positively correlated with the maximum local aperture,the initial normal stiffness K_(ni) is positively correlated with the elastic modulus and negatively correlated with the fracture roughness and dislocating ratio,and n is positively correlated with the fracture roughness and dislocating ratio.A model was established to predict the three coefficients,and the prediction values agree well with the experimental results.