【作者】 王抒；

【导师】 张顶立；

【作者基本信息】 北京交通大学 ， 地下工程， 2011， 硕士

【摘要】 京沪高速铁路隧道断面大、埋深小并且穿越多种不良和特殊地质条件,尤其是对于京沪高速铁路下穿京福高速公路段的风险管理与控制,对于保障京沪高铁隧道建设顺利进行,推动高速铁路隧道技术进步具有重要意义。本文针对京沪高速铁路大跨浅埋隧道下穿高速公路复杂条件下的风险控制,首先,研究并配制了适合于模拟下穿段围岩的相似材料,通过非线性回归分析方法研究了相似材料配比范围内弹性模量等相关指标的函数关系及变化趋势；使用二次回归通用旋转设计法,制定了该相似材料的粘聚力与内摩擦角等物理力学指标的测定试验方案,并由试验结果得出了Ⅳ级围岩模型试验的最佳配比。其次,将缩尺模型试验与数值模拟两种方法进行有机结合,设计了隧道下穿段的缩尺比例模型试验,对下穿过程中拟采用的管棚、超前小导管等预支护措施进行了相似比为1：30的模型试验,并通过对开挖后各种预支护措施对于控制地表沉降与围岩压力的作用效果进行分析比较,确定了下穿段最终所采用的预支护措施；结合下穿段实际情况,使用数值模拟的方法对下穿段拟采用的两台阶法等六种工法进行了施工方案比选,通过对地表沉降以及围岩与初支,初支与二衬接触应力的计算,确定了对于下穿段风险控制最为有利的工法。最后,通过在金牛山隧道下穿段布设监测仪器进行监控量测的方式,对于下穿段施工过程中所产生的风险进行监控并对内力变化过程进行分析,并对模型试验与数值模拟的结果进行对比验证。更多还原

【Abstract】 Tunnels of Beijing to Shanghai high speed railway have large-span, shallow, and beneath a variety and special of adverse geological conditions. Especially for the risk management and control during the process of Beijing to Shanghai high speed railway beneath Beijing to Fuzhou Expressway.This paper is focusing on the complex condition and risk control of Beijing to Shanghai high speed railway tunnel beneath the highway. At first, similar material, which was suitable for simulating the rock of beneath section, was researched and prepared. Non-linear regression analysis was used for determining changes on elastic modulus and other functions and trends of relevant indicators of similar material. Quadratic combination universal rotary design of response surface analysis was used for exploring the physical and mechanical indices of similar material such as cohesion and internal friction angle. After that, the best ratio of model test about IV level rock was determined. At second, combining scale model test and numerical simulation the two ways, scale model test of beneath section was designed. Model test with the ratio of 1:30 is prepared to identify pipe roof, advanced small pipe and other advance protection measures which are to be adopted during the beneath process. A variety of measures to pre-support were compared for the effects on controlling surface subsidence and rock pressure, and the final pre-support was fixed. Combining with the actual situation of beneath section, numerical simulation method was used to compare 6 construction methods such as two-step method. Through the calculation of surface subsidence, contact stress between surrounding rock and early support, early support and second lining. The best method for controlling risk of beneath section was fixed. Finally, through the way of monitoring, layouting monitoring instruments in beneath section, during excavation was monitoring, change processes of internal forces were analyzed and at the same time, the result of scale model test and numerical simulation was verified.更多还原