不同含水状态下岩石力学特性和应力应变关系研究  

Study on Mechanical Properties of Rock and Stress-Strain Relationship Under Different Water Bearing Conditions

作　　者：严召松 许江[1,3] 郑丽婷 彭守建[1,3] 杨榕 梁拯 YAN Zhaosong;XU Jiang;ZHENG Liting;PENG Shoujian;YANG Rong;LIANG Zheng(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;School of Architectural Engineering,Guangdong University of Industry and Technology,Zhaoqing,Guangdong 526040,China;National Local Joint Engineering Laboratory of Complex Gas Layer Gas Drainage,Chongqing University,Chongqing 400044,China;Training Center,Guangdong University of Industry and Technology,Zhaoqing,Guangdong 526040,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]广东工商职业技术大学建筑工程学院,广东肇庆市526040 [3]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重重庆400044 [4]广东工商职业技术大学实训中心,广东肇庆市526040

出　　处：《矿业研究与开发》2023年第1期86-90,共5页Mining Research and Development

基　　金：国家自然科学基金重点项目(51434003);重庆市教委科学技术项目(KJ1711271);中央高校基本科研业务费项目(106112017CDJQJ248825)。

摘　　要：进行不同含水率的狄野凝灰岩三轴试验,分析岩石在三向荷载作用下的应力-应变曲线的变化形态和峰值应力、应变和弹性模量,获得结论如下:(1)峰值应力、应变及弹性模量随相对含水率增加呈线性降低;(2)应力-应变曲线在加载初期因裂隙闭合呈上凹形态,随后近似线性增长,之后偏离线性呈上凸形态,峰值应力之前可用三次多项式较好地拟合;峰值应力之后,无论干燥状态下试件的应力快速降低,曲线呈上凹形态,还是含水状态下应力缓慢降低,呈现塑性流动,均可用分式函数较好地拟合;(3)根据提供的分段拟合函数,结合相对含水率与峰值应力、应变线性关系,可近似获得不同含水状态下岩石的应力-应变曲线。The triaxial test of Ogino tuff with different moisture contents was carried out to analyze the variation of stress-strain curve,peak stress,strain and elastic modulus of rock under three-dimensional load.The conclusions are drawn as follows.Firstly,the peak stress,strain and elastic modulus decrease linearly with the increase of relative moisture content.Secondly,at the initial stage of loading,the stress-strain curve concaves up due to crack closure,then increases approximately linearly,and then deviates from linearity to convex.The stress-strain curve can be well fitted by cubic polynomial before the peak stress.After the peak strength,whether the stress of the specimen decreases rapidly in the dry state and the curve is concave,or the stress decreases slowly in the water state and the curve presents plastic flow,they both can be well fitted by fractional function.Thirdly,according to the provided piecewise fitting function and the linear relationship between relative moisture content with peak stress and strain,the rock stress-strain curves under different moisture contents can be obtained approximately.

关 键 词：相对含水率 峰值应变 峰值应力 力学特性 凝灰岩 

分 类 号：TD313[矿业工程—矿井建设] TU45[建筑科学—岩土工程]