岩质斜坡多期震裂损伤过程与累积效应研究

The strong earthquake caused a large number of shattered slopes. Under the coupling effects of multi-period seismic damage and long-term gravity, the slope is prone to sudden disaster, resulting in unpredictable losses. How to identify the internal seismic damage and reveal the damage accumulation- destructive mechanism of rock slope are the key scientific issues. To this end, the project tries to explore the slope damage mechanism and geomechanical model based on the field investigation. Then, a physical simulation experiment of vibration-based slope damage identification will carry out to study the mechanism of slope damage and the cumulative effect. After that, based on the discrete-continuous coupled numerical algorithm, a numerical simulation platform will establish to reveal the damage accumulation- destructive mechanism of rock slope under seismic loading. This will provide a theoretical basis for the identification of the failure boundary and the scale of shattering mountains, and provides technical support for effective investigation, pre-assessment and post-prevention of geological hazards in earthquake mountainous areas.

构造活跃山区存在大量强烈地震作用形成的“松而未动，裂而未滑”山体，其在多期震裂损伤累积和长期重力耦合作用下极易发生突发性大型地质灾害。如何识别岩质斜坡内部震裂损伤并揭示损伤累积-灾变机理是亟待解决的关键科学问题。为此，在对强震区岩质斜坡震裂损伤特征及典型震裂山体失稳案例的调查基础之上，构建斜坡震裂损伤地质力学模型；开展基于振动的斜坡震裂损伤物理模拟试验，研究斜坡震裂损伤机理及损伤累积效应；通过搭建斜坡多期震裂损伤-灾变全过程数值模拟平台，揭示裂隙岩体斜坡损伤累积-灾变的过程机制，进而为震裂山体失稳边界与灾害规模的判识提供理论依据，对地震山区地质灾害隐患点有效排查、灾前预判和灾后防治提供技术支撑。

立足于强震区震裂山体失稳事件频发的事实，针对现阶段斜坡内部震裂损伤判识技术方法欠缺及损伤累积-灾变过程机制认识不清的问题，项目开展了岩质斜坡多期震裂损伤过程与累积效应研究，在对强震区岩质斜坡震裂损伤特征及典型震裂山体失稳案例的调查基础之上，构建了基于能量耗散的斜坡震裂损伤地质力学模型；提出了基于振动的斜坡震裂损伤识别方法；发展了离散-连续耦合的高效数值动力分析方法；揭示了裂隙岩体斜坡震裂机理及损伤累积-灾变过程机制，为大型震裂山体失稳边界与灾害规模的判识提供理论依据。