饱水作用对锁固型岩体变形特性影响研究  

Study on influence of water saturation effect on deformation characteristics of locked rock mass

作　　者：李娜 张科 金克盛[2] LI Na;ZHANG Ke;JIN Kesheng(Faculty of Civil and Architectural Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500,China;Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]昆明理工大学电力工程学院,云南昆明650500

出　　处：《中国安全生产科学技术》2023年第4期100-106,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(11902128);云南省应用基础研究计划项目(2019FI012)。

摘　　要：为了研究饱水作用对锁固型岩体力学性质和变形特性的影响,对干燥与饱水状态下的岩体进行单轴压缩试验,利用数字图像相关方法对岩体加载过程进行非接触式实时变形监测。研究结果表明:饱水作用弱化了岩体的单轴抗压强度和弹性模量;应变场演化特征表明饱水作用增大试件的变形量,但未改变试件的裂纹扩展路径和最终破坏模式;岩桥锁固段剪切裂纹起裂和峰值应力时伴随着应变场分异速率突增,可作为锁固型岩体滑动和失稳破坏的前兆信号,饱水作用对应变场分异速率峰值有削弱作用;通过计算预制裂隙两侧的错动位移,定量揭示岩体失稳过程中岩桥的“锁固效应”。研究结果可为涉水环境下锁固型岩体的稳定性问题和灾变监测提供参考。In order to study the influence of water saturation effect on the mechanical properties and deformation characteristics of locked rock mass,the uniaxial compression tests were performed on the rock mass under dry and water-saturated state,and the digital image correlation method was used to carry out the non-contact and real-time deformation monitoring of the rock mass during loading.The results showed that the water saturation effect weakened the uniaxial compressive strength and elastic modulus of rock mass.The evolution characteristics of strain field presented that the deformation of specimens was increased by water saturation effect,but the crack propagation path and final failure mode were not changed.The differentiation rate of strain field increased sharply when the shear crack initiation and the peak stress occurred in the rock bridge locked section,which could be used as the precursor signal of sliding and instability failure in the locked rock mass,and the water saturation effect weakened the peak value of strain field differentiation rate.The"locking effect"of rock bridge in the failure process of rock mass was quantitatively revealed by calculating the shear displacement on both sides of pre-existing fracture.The research results can provide reference for the stability and disaster monitoring of locked rock mass in wading environment.

关 键 词：裂隙岩体 数字图像相关方法 应变场分异 前兆 错动位移 锁固效应 

分 类 号：X935[环境科学与工程—安全科学]