酸性溶液侵蚀红层软岩流固耦合蠕变特性分析  

Analysis of Fluid-Solid Coupling Creep Characteristics of Red-Bed Soft Rock Eroded by Acidic Solution

作　　者：伊正男 张树光 漆文浩 范明卓 孙晔 YI Zhengnan;ZHANG Shuguang;QI Wenhao;FAN Mingzhuo;SUN Ye(College of Civil Engineering and Architcture,Guilin university of technology,Guilin,Guangxi 541004,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林市541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林市541004

出　　处：《矿业研究与开发》2025年第2期171-183,共13页Mining Research and Development

基　　金：国家自然科学基金项目(42067041)。

摘　　要：为探究酸雨作用下风化红层软岩的损伤劣化和滑坡失稳机制,进行酸性溶液反复侵蚀下红层软岩应力-渗流耦合蠕变试验,分析岩石耦合蠕变力学行为及损伤演化机制。通过分析不同试验条件下岩石蠕变时间-应变曲线,以及水化学损伤前后岩石蠕变速率与渗透率的相互关系,探究化学-应力-渗流耦合作用下岩石损伤劣化机理及影响岩石损伤的主要因素。结果表明:水化学作用会对岩石三轴强度造成折减,最低降低幅度为36.31%,最大降幅为48.03%,同时受水化学反复侵蚀作用后的岩石蠕变曲线发散性更强;不同水力条件下岩石损伤规律与应力水平呈现良好的正相关性,水化学损伤破坏程度远高于渗流及应力作用破坏程度,受水化学损伤后岩石渗流及应力作用均会加剧岩石损伤劣化,高渗流压力作用下,岩石蠕变效应更加明显。最后引入化学损伤因子,建立了包含化学损伤的应力-渗流耦合作用下的三轴非线性损伤蠕变模型,该模型可以描述水化学作用下红层软岩流固耦合蠕变特征,拟合效果良好。To explore the damage degradation and landslide instability mechanism of weathered red-bed soft rock under the action of acid rain,the stress-seepage coupling creep test of red-bed soft rock under repeated erosion of acid solution was carried out,and the mechanical behavior and damage evolution mechanism of rock coupling creep were analyzed.By analyzing the time-strain curve of rock creep under different test conditions and the relationship between rock creep rate and permeability before and after hydrochemical damage,the mechanism of rock damage degradation under the coupling of chemical-stress-seepage and the main factors affecting rock damage were explored.The results show that the hydrochemical action will reduce the triaxial strength of the rock,with a minimum reduction of 36.31%and a maximum reduction of 48.03%.At the same time,the rock creep curve after repeated erosion by hydrochemical action is more divergent.There is a good positive correlation between rock damage law and stress level under different hydraulic conditions.The degree of hydrochemical damage is much higher than that of seepage and stress.After hydrochemical damage,rock seepage and stress will aggravate rock damage degradation.Under the action of high seepage pressure,the creep effect of rock is more obvious.Finally,the chemical damage factor is introduced to establish a triaxial nonlinear damage creep model under the stress-seepage coupling effect including chemical damage,which can describe the fluid-solid coupling creep characteristics of red-bed soft rock under the action of hydrochemical action,and the fitting effect is good.

关 键 词：红层软岩 蠕变特性 应力-渗流耦合 岩石损伤劣化机理 水化学作用 

分 类 号：TD315[矿业工程—矿井建设]