含水泥砂岩声发射阶段特征与损伤演化研究  

The Acoustic Emission Stage Characteristics and Damage Evolution of Argillaceous Siltstone

作　　者：宋浩然 李守宇 张庆文 郭永发[2] 许国全 Song Haoran;Li Shouyu;Zhang Qingwen;Guo Yongfa;Xu Guoquan(College of Civil Engineering,Southwest Forestry University,Kunming 650224,P.R.China;Kunming Survey,Design and Research Institute Co.,Ltd.of CREEC,Kunming 650200,P.R.China;The Fifth Engineering Co.,Ltd.,of China Railway First Engineering Group,Baoji,Shanxi 721006,P.R.China)

机构地区：[1]西南林业大学土木工程学院,昆明650224 [2]中铁二院昆明勘察设计研究院有限责任公司,昆明650200 [3]中铁一局集团第五工程有限公司,陕西宝鸡721006

出　　处：《地下空间与工程学报》2024年第1期72-81,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51768065);云南省科技厅重点研发计划(社会发展)(2018BC008);中国中铁股份有限公司科技研究开发计划(2020-重大专项-04-05);中铁一局集团滇中引水大理Ⅱ段施工6标科研项目(XLKK-333-2021-024)。

摘　　要：岩石内部的损伤会在水作用下产生劣化,掌握岩石的失稳破坏状态对富水隧洞围岩稳定性的判别具有重要意义。本文以不同含水状态下的泥质粉砂岩为试验对象,结合声发射设备开展非线性对径加载劈裂试验。研究表明:(1)在岩石破坏的5个阶段中b值、S值的演化趋势有明显的阶段特征;(2)不同含水状态的岩样在不同阶段的声发射演化特征存在一定差异,在含水率高于1.0458%后,岩样劣化明显;(3)b值突然攀升、S值突发性跃迁可视作粉砂岩失稳破坏的前兆特征;(4)基于连续损伤介质力学,得出了两种含水状态岩样的本构,并以实验曲线验证了理论曲线的合理性。以上岩样的声发射阶段特征及损伤演化规律可为隧洞涌水情况下岩体稳定性监测提供参考。Damage in the rock will deteriorate under the water-rock interaction.This paper focuses on the destabilized damage state of muddy siltstone under different water content states.Nonlinear buttress loading splitting experiments were conducted,and acoustic emission equipment was used to analyze the results.The study reveals that:(1)The evolution trend of b-value and S-value in the five stages of rock damage exhibits distinct stage characteristics.(2)The acoustic emission evolution characteristics of rock samples in different water-bearing states during various stages exhibit certain differences,and the rock samples deteriorate significantly when the water content exceeds 1.0458%.(3)The sudden climb of b-value and the sudden jump of S-value can be considered as the precursor characteristics of the instability of pulverized sandstone damage.(4)The principal structures of rock samples in two water-bearing states are derived based on the continuous damage medium mechanics,and the rationality of the theoretical curves is verified with experimental curves.The acoustic emission characteristics and damage evolution laws of the rock samples can serve as a reference for monitoring the stability of the rock body during water influx in tunnels.

关 键 词：泥质粉砂岩 声发射 微观破裂机制 水岩作用 损伤本构模型 

分 类 号：TU458[建筑科学—岩土工程]