高层建筑岩石洞室地基稳定性分析方法与应用

STABILITY ANALYSIS METHOD AND ITS APPLICATION IN HIGH-RISE BUILDING WITH ROCK CAVERN FOUNDATION

随着地面与地下空间的综合开发利用日愈增多,地面建筑与地下工程的冲突也日愈突出,地处山区的山城重庆,这类问题尤为突出,研究岩石洞室地基的稳定性已成为重庆市建设中急需解决的一项重要课题。论文结合重庆市岩石洞室地基工程,通过理论研究、数值模拟实验、现场测试和智能识别等技术,较为全面系统地分析了岩石洞室地基的稳定性问题,明确了开洞地基和地基开洞的安全系数确定方法,建立了岩石洞室地基的智能识别系统,提出了研究复杂洞室地基稳定性的综合分析方法推荐思路框架。

With the increase of urban underground and ground engineering, the conflict between ground building and underground engineering is more and more. In this view, it is more important for accurately evaluating the stability of rock foundation with caverns. It becomes a special outstanding and urgent problem to study stability of rock foundation with caverns in Chongqing mountain city. Through theory study, numerical simulation, field testing and intelligent identification technology, the systematic research of rock foundation with caverns is carried out by combining with Chongqing building rock cavern foundation. The work can be summarized as: (1) By using strength reduction FEM and load-increasing FEM, the foundation with an opened cavern subjected to loading is proposed. As a result, load-increasing FEM is suitable for stability analysis of foundation with an opened cavern, but for foundation with an opening cavern, strength reduction FEM is feasible. (2) The ratio of between plastic zone area and cavern area is proposed to determine the safety factor of the cavern foundation. (3) By combining adaptive-network-based fuzzy inference (ANFIS) which provides an analytical approximation of the true FEM calculation and uniform experimental design, selecting typical sample points, an intelligent identification system to analyze the stability of cavern foundation is established. (4) Based on the analysis of complex rock cavern foundation engineering examples in Chongqing city, the research route for study stability of complex cavern foundation is recommended.