动载作用下非均质岩石地基的动力响应研究

There are many earthquakes occurring in our country, and regional earthquakes are extremely active and frequent. The dynamic response of heterogeneous foundation rock mass under seismic loading is inevitably confronted in the process of the engineering design. However, the seismic behaviors of bedrock foundations, especially the influence of discontinuities on the seismic responses of bedrock, are still not well understood at present. This proposal focuses on the dynamic response of heterogeneous rock-mass foundation subjected to seismic loading using a combined method of in-situ survey, mechanical model analysis, numerical simulation and model test in lab. With the study on discontinuities distributed in rock-mass and in-situ stress test, analytical methods of orientation and fractal geometry model that reflect the characteristics of rock mass structure would be established. High-performance experimental equipment that focuses on centrifuge model test would be developed. With a combination of numerical analysis and model test, the influence of discontinuities parameters on seismic wave propagating and the influence of seismic wave parameters on the dynamic response of the fractured rock mass would be studied. Based on these researches above, propagation characteristic for seismic wave propagating through heterogeneous rock-mass is examined, as well as cracks propagation and coalescence in rock-mass under seismic loading. Through analyzing the research results, a comprehensive method system focusing on boththe seismic resistant design and stability assessment of rock foundation for important structures like nuclear power plants will be suggested, which can provide the theoretical basis and guidances for the planning, site selection, design and safety assessment of important constructions.

我国区域地震活动非常活跃和频繁,地震动荷载作用下非均质岩石地基的动力响应行为是工程设计必须考虑的问题。本课题围绕非均质裂隙岩体的地震动力响应问题，采用现场测试、理论建模、数值分析和模型试验相结合的方法开展研究工作。通过系统研究建立反映岩体结构特征的分形几何模型，并提出不连续面产状分析测试方法；研发针对裂隙岩体地震动力响应研究的高性能震动试验装置，并开展动态离心机模型试验，结合数值模拟分析，对比分析不连续面参数对地震波传播的影响以及地震波参数对裂隙岩体动力响应行为的影响，揭示地震波在裂隙岩体中的传播特征，阐明强震作用下裂隙岩体的动力变形和破坏特征。最终建立裂隙岩体地基地震动力响应综合分析方法和评价体系，从长期稳定的角度为核电设施等重要建（构）筑物在强烈地震力作用下的力学稳定性和安全性提供分析和评价依据，为重要建（构）筑物的规划、选址、设计和安全性评价提供相关的理论基础和指导方法。

我国区域地震活动非常活跃和频繁，地震动荷载作用下非均质岩石地基的动力响应行为是工程设计必须考虑的问题。本课题围绕非均质裂隙岩体的动力响应问题，采用现场测试、理论建模、数值分析和模型试验相结合的方法开展研究工作。建立岩体结构特征的分形几何模型及不连续面产状分析测试方法；研发针对裂隙岩体地震作用下动力响应研究的高性能震动试验装置；基于离心模型试验揭示地震波在裂隙岩体中的传播特征以及不连续面对地震波传播的影响；阐明强震作用下节理岩体的动力变形和破坏特征；对比分析地震波参数对裂隙岩体动力响应的影响。最终结合抗震设计规范，给出明确的裂隙岩体地基地震动力响应综合分析方法和评价体系，并依托典型工程开展了工程应用研究。.该评价技术联系国际关于该方法的最新进展，借鉴国际已有的抗震计算方法和法规应用于国内，是一个很好的技术储备和应用，从长期稳定的角度为核电设施等重要建（构）筑物在强烈地震力作用下的力学稳定性和安全性提供分析和评价依据，为重要建（构）筑物的规划、选址、设计和安全性评价提供相关的理论基础和指导方法。相关研究成果已经获得授权国家发明专利13项；发表学术论文41篇，其中SCI/EI检索37篇；已经培养毕业博士研究生2名，毕业硕士研究生9名，在站博士后1名，在读博士/硕士研究生3名。获得山东省技术发明一等奖1项，获得教育部自然科学奖1项，获得中国岩石力学与工程学会技术发明一等奖1项；科学出版社出版学术专著3部。