摘要
岩体内部各种尺度结构面的力学行为决定着工程围岩的稳定性。随着地下工程埋深的增大,扰动环境下时滞型工程灾害的威胁日益加剧。基于对现场观测、室内试验和理论模型等方面研究的系统总结,认为构造控制时滞型岩爆、工程性地震的远程诱发本质上是岩体结构面受扰动诱发的滞后失稳。提出了结构面剪切蠕变的“扰动后效”新概念,即处于剪切蠕变过程中的结构面受到扰动后,其影响在扰动结束后仍持续存在,导致受扰动结构面的后续蠕变过程表现出与未受扰动时不同的状态和非线性行为。基于“扰动后效”的典型表现,探讨了结构面剪切蠕变的临界转变行为及其影响因素,指出扰动强度的科学表征、滞后失稳临界转变条件与机制、临界转变过程理论模型、岩石-结构面-岩体跨尺度研究等是亟待解决的关键问题。解决以上问题将为深入理解地震的远程诱发机制和有效防控时滞型工程灾害提供有力支撑。
The mechanical behavior of structural planes at various scales within a rock mass determines the stability of the surrounding rock in engineering projects.With the continuous increase in the burial depth of underground engineering projects,the threat posed by time-delay engineering disasters under dis-turbed environments is becoming more and more prominent.Based on a systematic review of research from field observations,laboratory experiments,and theoretical models,it is concluded that the remote induction of tectonically controlled time-delayed rockbursts and engineering seismic events is essentially the delayed instability of rock mass structural planes triggered by disturbances.A new concept termed the disturbance aftereffect of shear creep on structural planes is proposed.This concept refers to the phenome-non that,when a structural plane undergoing shear creep is subjected to a disturbance,the influence of the disturbance persists even after the disturbance has ceased.As a result,the subsequent creep process of the disturbed structural plane exhibits different states and nonlinear behaviors compared to its undisturbed condition.Based on the typical manifestations of the disturbance aftereffect,the critical transition behavior of shear creep in structural planes and its influencing factors are explored.In addition,this study high-lights that the scientific characterization of disturbance intensity,the conditions and mechanisms of delayed instability critical transition,theoretical models of the critical transition process,and cross-scale research of rock-structural plane-rock mass systems are key issues that urgently need to be resolved.The solution of these problems will provide a solid foundation for understanding the mechanisms of remote triggering of earthquakes and the effective prevention of time-delay engineering disasters.
作者
范鹏贤
何磊
杨嘉楠
李杰
王明洋
FAN Pengxian;HE Lei;YANG Jianan;LI Jie;WANG Mingyang(College of National Defense Engineering,Army Engineering University of PLA,Nanjing 210007,China)
出处
《陆军工程大学学报》
2025年第4期1-13,共13页
Journal of Army Engineering University of PLA
基金
国家重点研发计划(2024YFF0508204)
国家自然科学基金重点/面上项目(52438007,52279120)。
关键词
结构面
剪切蠕变
时滞型工程灾害
扰动后效
临界转变
rock joint
shear creep
time-delay engineering disaster
post-disturbance effect
critical transition
