水岩耦合变形破坏的跨尺度过程与多尺度特征研究

Hydraulic fracturing engineering, hydraulic fracturing in dam site, water inrush in coal mines and tunnels etc are the trans-scale failure process induced by the accumulation of rock damage evolution, the root in which is the the multiscale effect of hydro-mechanical coupling in the water-rock phases, as well as a rock mechanics frontier orientation. The purposes of this project are (1) to accurately describe spatial distribution of rock grains and digitize characterization based on scanning electron microscope and digital image correlation techniques;(2) to construct a constitutive model for rock deformation and failure trans-scale process analysis under water-rock coupling based on the law of the results of the micro-meso-macroscopic experiments;(3)to integrate the multiscale finite element method and its basic algorithms into the classical fluid-solid coupling finite element analysis framework with the statistical meso-damage theory and the constructed constitutive model to build the multiscale computing parallel platform of rock progressive failure and water flow;(4) to in-depth reveal the multiscale features and the mechanisms of rock trans-scale deformation and failure process under water-rock coupling based on both numerical simulations and micro-meso-macroscopic experiments. Expected results of the project can provide the theoretical basis for the rational design and evaluation of the related engineering.

水压致裂、坝址水力劈裂、煤矿和隧道突水等均是岩体损伤演化积累诱发跨尺度破坏的过程, 其根源在于水-岩两相中渗流-应力两场耦合的多尺度效应，并成为当前岩石力学研究的前沿方向。本项目旨在（1）基于电镜扫描和数字图像处理，对岩石介质空间分布进行准确描述和数字表征；（2）基于微细宏观实验结果规律，建立适用于水岩耦合变形破坏跨尺度过程分析的本构行为演绎模型；（3）将多尺度有限元方法及其基础算法纳入到传统流固耦合有限元分析框架，结合统计细观损伤理论和建立的本构模型，形成岩石渐进破坏及水体流动的多尺度计算方法，并并行工具化实现；（4）通过数值模拟与微细宏观物理试验相结合地揭示水岩耦合跨尺度变形破坏过程的多尺度特征和蕴含的机理。项目预期成果可为相关工程的合理设计与评价提供理论依据。

水压致裂、坝址水力劈裂、煤矿和隧道突水等均是岩体损伤演化积累诱发跨尺度破坏的过程, 其根源在于水-岩两相中渗流-应力两场耦合的多尺度效应，并成为当前岩石力学研究的前沿方向。项目建立适用于水岩耦合变形破坏跨尺度过程分析的统计细观损伤力学模型，并对岩体变形破坏多尺度并行计算与工具化进行了研究；建立了适用于分析岩石变形及水体流动的多尺度数值计算方法。同时，通过数值模拟与微细宏观物理试验相结合地揭示水岩耦合跨尺度变形破坏过程的多尺度特征和蕴含的机理。项目成果可为相关工程的合理设计与评价提供理论依据。