考虑温度效应的岩石动态损伤及能量耗损特征研究

项目名称： 考虑温度效应的岩石动态损伤及能量耗损特征研究

项目编号： No.51304241

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 尹土兵

作者单位： 中南大学

项目金额： 25万元

中文摘要： 温度是影响深部岩体工程的重要因素之一。深部矿床开采、核废料存储和地热的开发利用等重大工程在开挖建设过程中都需要掌握岩石在高温高应力和动载荷联合作用下的力学特征和能耗规律。本项目紧密围绕温度作用下岩石的冲击损伤特性这一研究主题，利用温压耦合及动力扰动实验系统,开展不同温度作用下的岩石冲击损伤实验，旨在探讨温度作用对岩石冲击损伤力学参数特征、细观特征参量及能耗规律的影响。项目以冲击动力学、损伤力学理论、分形理论、数值仿真等多种理论和分析方法为手段，获得不同温度作用下的高应力岩石细观特征参量、初始损伤、能量耗散及冲击载荷的量化关系，确定损伤变量的定义和描述方法，阐明温度作用下高应力岩石冲击损伤破坏机理，并建立考虑温度效应的岩石动态损伤演化方程和本构模型，探索温度作用下岩石损伤细观特征参量与能量耗散的联系并建立能耗方程。本项目的研究成果将为深部岩石工程开挖及防灾中的温度效应控制提供可靠的理论基础。

中文关键词： 岩石动力学；温度效应；冲击载荷；动态损伤；能量耗散

英文摘要： Temperature is the one of important factors that affects rock mechanical properties in deep rock mass engineering. It is necessary to study and understand mechanical and energy dissipation properties of rocks under different temperatures and dynamic loads condition to meet the increasing demands of deep mining, nuclear waste disposal and development and utilization of geothermal. The researches of this program focus on dynamic damage characteristics of rocks under temperatures. The impact damage experiment of rocks will be conducted on coupling effects of temperature and pressure experiment system in order to discuss the affect of temperature for dynamic damage, microscopic characteristic parameters and energy dissipation characteristics of rocks. Based on rock dynamic, damage mechanics theory, fractal theory and numerical modeling, the quantitative relationship between energy dissipation and dynamic damage characteristics of rocks under temperature are analyzed and the mechanism of dynamic damage is revealed under different temperature. In this research, the rock damage evolution equation and constitutive model are given with considering the effect of Temperature. In addition, the relation between the parameter of microscopic characteristics and energy dissipation rules will be established in order to obtain en

英文关键词： rock dynamics；thermal effect；impact load；dynamic damage；energy dissipation