摘要
高地应力作用下的深部围岩巷道分区破裂化现象,一直是岩土工程领域研究的热点和难点,其产生和发展对深部工程安全造成了很大影响。当材料发生屈服破坏时,能量出现一定耗散,随着耗散的进行,材料结构也产生相应变化形成新的组织结构,该过程类似于协同学上的自组织过程,此时传统弹塑性力学已经不太能发挥作用,需要借助物理学理论;深部巷道围岩在高地应力作用下,当变形超过弹性极限时,也会出现类似于耗散结构现象,围岩结构需要经历自组织过程形成新的耗散结构,此过程和物理学中的渐进相变现象类似;实际上,深部巷道围岩的变形破坏过程是一个固体向流体转换的二级相变过程,即它具有渐进相变特征。首先对现场尺度、实验室尺度以及模拟试验中出现的各种分区破裂化现象进行了比较分析;随后,基于相变理论模型,通过Poincare解析的参数摄动方法对非线性高阶控制方程进行了近似解析,各参数在近似解中的敏感性也得到了分析;最后,将理论模型计算结果和金属矿山金川矿700 m深的水平巷道中监测到的分区破裂化现场实测数据进行对比验证,结果表明理论半解析解的计算结果与实际测量数据高度符合,验证了针对分区破裂化的相变理论模型和计算方法的正确性。
The topic of zonal fracture in deep surrounding rock roadway under high ground stress is a challenging and widely researched area in geotechnical engineering,with significant implications for the safety of deep engineering project.When the material yield damage occurs,there is a certain dissipation of energy,and as the dissipation proceeds,the material structure also produces some corresponding changes to form a new organizational structure,the process is similar to the self-organization process on the concordance,at this time the traditional elastic-plastic mechanics is not very useful,need to use the physical theory.Deep tunnel surrounding rock under high ground stress,when its deformation exceeds the elastic limit,will also has a similar dissipation structure phenomenon.The surrounding rock structure needs to go through a self-organization process to form a new dissipative structure,and this process is similar to the phenomenon of progressive phase change in physics.This paper explores the deformation and failure process of the surrounding rock in deep roadway,which is characterized as a gradual phase transition from solid to fluid.The study analyzes various zonal fracturing phenomena in field scale,laboratory scale,and simulation tests,and develops a phase transition theoretical model to approximate the nonlinear higher order control equation using Poincare-analytic parametric regression method.The sensitivity of each parameter in the approximate solution is also analyzed.Finally,the study validates the theoretical model by comparing the calculated results with the on-site measured data of zonal fracturing in a 700 m deep horizontal roadway in a metal mine.
作者
燕发源
王恩志
刘晓丽
戚承志
马庆
谢维强
马前驰
YAN Fayuan;WANG Enzhi;LIU Xiaoli;QI Chengzhi;MA Qing;XIE Weiqiang;MA Qianchi(School of Civil Engineering,Tsinghua University,Beijing 100084,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2024年第S01期72-79,共8页
Journal of China Coal Society
基金
清华大学水沙科学与水利水电工程国家重点实验室自主课题资助项目(2022-KY-02)
国家自然科学重点基金资助项目(41831290)
国家自然科学基金面上资助项目(52079068)
关键词
相变理论
深部围岩
分区破裂
非线性
岩石力学
phase transition theory
deep surrounding rock
partition rupture
nonlinear
rock mechanics
