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地铁隧道穿越既有桥梁及地裂缝带施工的现场监测与数值模拟研究
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摘要
地裂缝作为一种地质灾害在我国很多地区均有分布,给人们的生产生活带来了极大影响。西安是我国地裂缝灾害最严重的地区之一,并且随着城市的发展,地裂缝灾害的影响更加突显,如在建的西安地铁二号线就穿越多条地裂缝。为了保证地裂缝带地铁开挖和运营的安全,也为今后同类工程提供参考,本文以西安地铁二号线穿越长安立交及f6地裂缝段作为研究对象,通过现场监测和数值模拟的手段研究了隧道开挖过程中长安立交沉降和地层移动规律,主要内容有:
     1、介绍了我国地裂缝的分布情况和我国地裂缝灾害的成灾原因和发展过程,对西安地区十余条地裂缝的分布和地质概况做了较为详细的介绍。
     2、分析了在隧道施工过程中长安立交和地层的变形规律,f6地裂缝的存在在施工期间对长安立交沉降的影响较明显,通过和有关规范的对比,认为在施工期间长安立交是安全的,满足使用要求。
     3、根据现场实际,利用ABAQUS有限元程序进行了三维模拟,对比了实测数据和模拟值,并通过模拟值分析了地层水平位移的规律和隧道衬砌、围岩的应力分布。
     4、通过收集西安地区十余条地裂缝资料和西安地铁二号线设计概况,建立了地铁隧道与地裂缝相距不同水平距离的二维模型,给出了在西安地区临近地裂缝开挖地铁隧道的建议最小设防距离。
As a kind of geological disaster distributed in many parts of China, ground fissure has given great impact and economic losses to people's life. Xi'an is one of the areas which suffered most from the ground fissure disaster. With the development of the city, the influence of the ground fissure becomes more obvious, such as No.2 Xi'an subway crossing many ground fissures. In order to ensure the safety of excavation and operation of subway tunnels in the zone of ground fissures, and also to provide reference for the similar constructions in the future, by taking NO.2 xi'an subway crossing f6 ground fissures segment and through the means of field monitoring and numerical simulation, this paper has studied the laws of Chang'an Interchange settlement and ground movement in the process of tunnel construction. The contents are mainly as follows:
     1. Introduced ground fissures distribution in China, summarized the reasons and the development of ground fissure hazards in our country and described the distribution and general geology of more than ten bands ground fissures in Xi'an area.
     2. Through the means of field monitoring, this paper has studied the laws of Chang'an Interchange settlement and ground movement in the process of tunnel construction. f6 Ground Fissure has significantly influenced on the settlement of Chang'an Interchange. Compared with some specifications, it is considered that Chang'an Interchange is safe in construction process and meets the operating requirements.
     3. Based on monitoring analysis, and according to the field practical situation, three-dimensional simulation has been conducted by ABAQUS finite element program on the spot. Compared the measured data and simulation value, and through simulation value, the author has analysized the law of layer level displacement and stress distribution of tunnel lining and surrounding rocks.
     4. Through collection of designing about several ground fissures in Xi'an area and No.2 Xi'an subway, this paper has established two-dimensional model with different horizontal distance from the tunnel center to the ground fissures. According to the simulation results and based on standard of maximum allowable ground settlement resulted from excavation of the subway in Beijing and Shenzhen, the author has reached the results that the suggested minimal fortification distance in Xi'an area subway tunnel near the ground fissures.
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