摘要
为研究水化学侵蚀条件下砂岩力学特性及能量损伤特征演化规律,利用水化学侵蚀后砂岩单轴压缩试验,分析了水化学侵蚀作用对砂岩力学特性及破坏形式的影响规律,研究了水化学侵蚀后砂岩受载过程中能量储存、耗散演化特性,得到了砂岩极限储能模型,建立了砂岩损伤评价指标。研究结果表明:水化学侵蚀后脆性砂岩出现应变软化,破坏形式由劈裂转化为剪切破坏;加载初期,外部输入能全部转化为耗散能,加载后期,则主要转化为弹性能,储存的弹性能达到砂岩储能极限是其发生破坏的主要原因;砂岩的储能极限与侵蚀溶液p H值非线性相关;建立的砂岩损伤评价指标(损伤因子D_(E))能够较好地评价水化学侵蚀后砂岩受载时的损伤程度。研究成果可为涉水岩土工程空间结构稳定性评估及安全评价提供参考。
Uniaxial compression tests of hydrochemical eroded sandstone were conducted to study the mechanical properties and energy damage characteristics of sandstone subjected to hydrochemical erosion. The influence of hydrochemical erosion on the mechanical properties and damage forms of sandstone was analyzed,and the evolution of energy storage and dissipation of rock during loading process investigated. A rock ultimate energy storage model was proposed,and the rock damage evaluation index established. The results show that hydrochemical eroded sandstone trend to exhibit strain softening behavior and shear failure mode. At the beginning of loading,all external input energy is transformed into dissipation energy and mainly converted into elastic energy in the end. The stored elastic energy in the rock reaching its ultimate capacity is the main reason for its failure. The energy storage ulimate of rocks shows a non-linear correlation with the pH values of chemical solutions. D_(E) is suitable for evaluating the damage degree of hydrochemical eroded rocks under uniaxial compression. The research results provide a basis for stability assessment and safety evaluation of water-related rock engineering.
作者
张晓悟
徐金海
黄宁
孙垒
曹悦
ZHANG Xiaowu;XU Jinhai;HUANG Ning;SUN Lei;CAO Yue(State Key Laboratory of Coal Resources and Safe Mining(CUMT),Xuzhou 221116,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China;China Construction First Group Corporation Limited,Shenzhen 518109,China)
出处
《采矿与岩层控制工程学报》
北大核心
2022年第6期75-85,共11页
Journal of Mining and Strata Control Engineering
基金
煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM2020X05)
国家自然科学基金联合基金重点资助项目(U21A20107)。
关键词
水化学侵蚀
力学特征
脆性岩石
能量演化
损伤
hydrochemical erosion
mechanical properties
brittle rocks
energy evolution
damage
