频繁爆炸荷载下岩体累积损伤效应及演化模型研究

项目名称： 频繁爆炸荷载下岩体累积损伤效应及演化模型研究

项目编号： No.41202227

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 张国华

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 24万元

中文摘要： 频繁爆炸荷载作用下，预留岩体的累积损伤效应非常显著，然而现有的研究水平严重滞后于工程应用。针对目前模型中广泛存在的只进行单次爆炸情况下损伤的模拟、模型中某些参数无明确的物理意义、理论模型的应用条件严格等缺陷，本课题以重大工程为依托，采用室内试验、现场原位测试、理论研究和数值计算相结合的方法，探索建立岩体累积损伤的新模型。以损伤与声发射的一致性为基础，给出基于声发射的损伤变量和声发射概率密度函数，建立准动态条件下岩石材料的损伤演化模型，揭示推进式往复频繁爆炸荷载作用下岩体的累积损伤效应及主控因素，建立仅考虑主控因素的岩体累积损伤演化模型。编写理论模型的计算程序，对依托工程开展数值仿真验证。研究成果将提高岩体累积损伤的理论水平，对地下工程的爆破安全控制和岩体动力失稳有重要意义。

中文关键词： 岩体；声发射；爆炸荷载；累积损伤；演化模型

英文摘要： The accumulative damage effect of reserved rock mass is very significant under frequent blasting loads. However, the existing level of research lags far behind the project application. There are following disadvantages in current model, some parameters of the models have no clear physical meaning, the application conditions of models subject to strictly limit and the simulation of damage can only be carried out in a single explosion case. This topic relied on the major projects, the laboratory test, the in-situ test, the theoretical analysis and the numerical simulation are combined, to explore the establishment of a new model for the accumulative damage of the rock. Based on the consistency of damage and acoustic emission, given the damage variable and acoustic emission probability density function from acoustic emission, and built the damage evolution model of rock material in quasi-dynamic conditions. The evolution of accumulated damage and the main controlling factors are revealed in advancing, to-and-fro, frequent blasting dynamic load. the accumulative damage model is established when the main controlling factors only are considered. The calculation procedure of the theoretical model be written, and carried out numerical simulation to verify the model. The research results will improve the theoretical leve

英文关键词： rock mass；acoustic emission；blasting load；accumulative damage；evolution model