深层地下空间开发中流土破坏机制的多尺度分析及风险评估

The soil flow damage due to confined aquifer with high pressure is one of the geological disaster during the development of the deep underground space in the coastal region generally with multi-aquifer-aquitard-system. Some researches were conducted on the soil flow during the development of the middle-shallow underground space, but the occurrence mechanism of the soil flow is still unclear. Moreover, the research results cannot be directly applied to the deep underground space because the geological-hydrogeological condition of the middle-shallow and deep underground space is different. This research is to resolve the problem of soil flow damage in the deep underground space development in Shanghai. Theory analysis, laboratory test, and numerical analysis are conducted to solve following scientific problems: i) to establish a multiscale model combined continuous and discrete medium based on smoothed particle hydrodynamics (SPH) to simulate the occurrence process of soil flow; 2) to reveal the occurrence mechanism of the soil flow due to the confined aquifer with high pressure in the deep underground space development; iii) to establish risk assessment system of the soil flow based on geographic information system (GIS), and propose the dewatering optimum design for the control of confined aquifer in the deep underground space development. This study is benefit to strengthen the mechanism of soil flow, keep the reliability and stability of the underground structures, and provide theoretical support of the plan and design of deep underground space development in the regions with multi-aquifer-aquitard-system.

沿海地区多层含水层体系中承压水引起的流土破坏是深层地下空间开发面临的主要地质问题之一。尽管在中浅部地下空间开发中已针对流土破坏进行了研究，但对流土破坏发生机制的解释尚不清晰，而且由于地质条件差异较大有关研究也不宜直接用于深层地下空间。本项目以上海地区地质环境为背景，针对深层地下空间开发中承压水引发的流土破坏问题，通过理论分析、室内试验、数值模拟相结合的方法，解决如下关键科学问题：①基于SPH光滑粒子流理论建立连续体-离散体联合的多尺度模型分析深层地下空间开发中流土破坏的发展过程；②探索深层地下空间开发中承压水引起流土破坏的发生机制；③基于GIS地理信息系统建立深层地下空间开发中流土破坏的风险评估系统，提出深层地下空间开发中承压水减压降水优化控制措施。研究成果可以丰富承压水引起流土破坏的机理研究，保证地下构筑物长期使用的耐久性和稳定性，为多层含水层地区深层地下空间开发的设计规划提供理论支撑。

本项目以上海地区的地质为对象，针对深层地下空间开发中承压水引发的流土破坏问题，通过室内试验、理论分析、数值模拟相结合的方法，解决如下关键科学问题：①建立连续体-离散体联合的多尺度模型分析深层地下空间开发中流土破坏的发展过程；②探索深层地下空间开发中承压水引起流土破坏的发生机制；③基于深层地下空间开发中流土破坏的风险评估，提出深层地下空间开发中承压水减压降水优化控制措施。研究成果丰富了承压水引起流土破坏的机理研究，为多层含水层地区深层地下空间开发的设计规划提供理论支撑。本项目共发表论文9篇，其中SCI期刊论文8篇；授权专利2项；培养研究生毕业3人。