【摘要】 研究目的:在西南及邻区进行高速铁路规划及修建过程中,桥隧占比较大的高速铁路以隧道形式穿越可溶岩地层中的垂直渗流带、季节变动带几率大大增加,该带岩溶强烈发育,常常形成复杂的大型溶洞,将极大地增加隧道施工、运营风险,开展高速铁路隧道穿越大型溶洞风险评估意义重大。研究结论:(1)高速铁路隧道穿越大型溶洞风险主要受溶洞底堆积物流失性、溶洞底堆积物稳定性、溶洞顶板安全性、溶洞洞壁稳定性等因素控制;(2)建立了高速铁路隧道穿越大型溶洞风险评估的TKCR模型,制定了指标量化标准,确立了各级因子的权重值;(3)利用TKCR风险评估模型对沪昆客专朱砂堡2号隧道遭遇的巨型溶洞进行了评估,溶洞大厅段计算评估分数为76分,属于高风险段;暗河交叉段评估分数为69. 5分,属于中风险段,与实际情况相符合;(4)本研究成果对于高速铁路隧道穿越大型溶洞的设计、施工、运营等都具有指导意义。更多还原

【Abstract】 Research purposes: During the planning and construction of high-speed railway in southwest China,the likelihood is greatly increased for the high-speed railways with large proportion of bridges and tunnels,to pass through some vertical seepage zone and seasonal variation zone in a soluble geological formation. Karst in such zones are highly developed,occuring large karst caverns. As a result,the risk of tunnel construction and operation has increased substantially. So,it is quite significant to assess the risk for the high-speed railway passing through large karst caverns.Research conclusions:( 1) The factors such as loss and stability of the deposit in the bottom of cavern,safety of the roof,and stability of the cavern walls are mainly influential to the risk of high-speed railway tunnels passing through karst caverns.( 2) The TKCR model for risk assessment is established,the index quantification standard is designed,the weight value of all-level factors is also determined.( 3) The TKCR model was applied to Zhushabao No. 2 tunnel of the Shanghai-Kunming high-speed railway,which encountered a giant karst cavern. The hall of the cavern was evaluated as 76,which belonged to high risky section; the junction of underground rivers was 69. 5,which belonged tomediate risky. This result corresponded with the actual situation.( 4) This research result is helpful to design,construction,operation of high-speed railway tunnel passing through large karst caverns.更多还原