基于灰色-尖点突变理论的砂岩破坏前兆研究  

Study on failure precursor of sandstone based on grey-cusp mutation theory

作　　者：唐垚 朱星[1] 王惠明 吴述彧 TANG Yao;ZHU Xing;WANG Huiming;WU Shuyu(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,Sichuan,China;Hydropower Planning and Design Institute Co.,Ltd.,Beijing 100120,China;Power China Guiyang Survey,Design and Research Institute Co.,Ltd.,Guiyang 550081,Guizhou,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]水电水利规划设计总院有限公司,北京100120 [3]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《水利水电技术（中英文）》2023年第8期178-187,共10页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(41877254);中国电建集团科技项目(DJ-ZDXM-2020-3);第二次青藏高原综合科学考察研究项目(2019QZKK0201)。

摘　　要：【目的】为探究砂岩失稳破坏灾变前兆信息,【方法】采用MTS刚性压力机开展了砂岩单轴加载试验,利用声发射监测系统对加载全过程进行实时探测,并对加载过程中砂岩的弹性应变能、耗散应变能、损伤变量演变特征进行详细分析。此外,基于灰色-尖点突变理论构建了声发射能量参数的尖点突变模型,系统分析了岩样失稳破坏过程中分叉集的响应特征。【结果】结果显示:在耗散能的驱动下,岩体出现损伤破裂,储能能力降低,且岩体能量、强度以45°裂缝倾角为转折点,随裂缝倾角的增加出现先减少后增大的现象。在塑性变形阶段,分叉集出现明显的突变,突变点对应的前兆应力大多占峰值应力的比例达75%以上,对应的前兆时间占失稳时间的比例达75%以上。【结论】结果表明:在耗散应变能的驱动下,岩样进入塑性变形阶段,岩样系统的状态也由稳定向非稳定转变,并在灾变前分叉集判别指标F出现突变,揭示了分叉集判别指标F作为岩体失稳前兆指标具有较强的普适性和较好的时效性。[Objective]In order to explore the precursor information of instability failure of sandstone,[Methods]uniaxial loading test of sandstone was carried out by using MTS rigid press,acoustic emission monitoring system was used to detect the whole process of loading in real time,and the evolution characteristics of elastic strain energy,dissipated strain energy and damage variables of sandstone during loading were analyzed in detail.In addition,a cusp mutation model of AE energy parameters was constructed based on the grey-cusp mutation theory,and the response characteristics of bifurcated sets during the instability and failure of rock samples were systematically analyzed.[Result]The result showed that driven by the dissipated energy,the rock mass appears damage and fracture,and the energy storage capacity decreases.Moreover,the rock mass energy and strength decreases first and then increases with the increase of the fracture dip Angle,taking the 45°fracture dip Angle as the turning point.In the plastic deformation stage,the bifurcation set appears obvious abrupt change,and the precursor stress corresponding to the abrupt point accounts for more than 75% of the peak stress,and the precursor time accounts for more than 75% of the instability time.[Conclusion]The result indicate that driven by the dissipated strain energy,the rock sample enters the plastic deformation stage,the state of the rock sample system changes from stable to unstable,and the bifurcation set discriminant index F changes abruptly before the disaster,which reveals that the bifurcation set discriminant index F as the precursor index of rock mass instability has strong universal applicability and good time-efficiency.

关 键 词：能量释放 声发射 灰色-尖点突变理论 前兆信息 

分 类 号：TV213.4[水利工程—水文学及水资源]