高速铁路穿越大型溶洞风险评估研究
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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。
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.
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.
引文
[1]曹化平,王科.铁路岩溶隧道工程地质选线研究[J].高速铁路技术,2011(1):31-36.Cao Huaping,Wang Ke. Study on Geological Route Selection for Railway Tunnel Engineering in Carst Zone[J]. High Speed Railway Technology,2011(1):31-36.
[2]蒋颖.溶洞分布部位对隧道稳定性影响的数值分析[J].铁道标准设计,2009(9):67-70.Jiang Ying. Numerical Analysis on Influence of Karst Cave Distribution on Tunnel Stability[J]. Railway Standard Design,2009(9):67-70.
[3]徐复兴,曾克峰.岩溶地区洞穴堆积物研究[J].云南水力发电,1999(4):5-8.Xu Fuxing,Zeng Kefeng. Study on Cave-deposit in Karst Areas[J]. Yunnan Water Power,1999(4):5-8.
[4]毛邦燕.现代深部岩溶形成机理及其对越岭隧道工程控制作用评价[D].成都:成都理工大学,2008.Mao Bangyan. Modern Deep Karst Formation Mechanism and Evaluation of Control Action on Crossmountain Tunnel[D]. Chengdu:Chengdu University of Technology,2008.
[5]毛邦燕,吴俊猛,喻洪平,等.沪昆客专黄果树至北盘江段地质选线方案研究[J].铁道工程学报,2011(10):19-24,29.Mao Bangyan,Wu Junmeng,Yu Hongping,etc. Study on Track Alignment in Huangguoshu-Beipanjiang Section of Shanghai-Kunming Passenger Dedicated Line[J]. Journal of Railway Engineering Society,2011(10):19-24,29.
[6]张营旭,张会刚,毛邦燕,等.沪昆客专朱砂堡#2隧道岩溶发育特征与形成机理及工程地质评价[J].路基工程,2017(5):218-222.Zhang Yingxu,Zhang Huigang,Mao Bangyan,etc.Karst Development Features&Forming Mechanism of Zhushabao Tunnel#2 on Shanghai-Kunming PDL and the Engineering Geological Evaluation[J]. Subgrade Engineering,2017(5):218-222.
[2]蒋颖.溶洞分布部位对隧道稳定性影响的数值分析[J].铁道标准设计,2009(9):67-70.Jiang Ying. Numerical Analysis on Influence of Karst Cave Distribution on Tunnel Stability[J]. Railway Standard Design,2009(9):67-70.
[3]徐复兴,曾克峰.岩溶地区洞穴堆积物研究[J].云南水力发电,1999(4):5-8.Xu Fuxing,Zeng Kefeng. Study on Cave-deposit in Karst Areas[J]. Yunnan Water Power,1999(4):5-8.
[4]毛邦燕.现代深部岩溶形成机理及其对越岭隧道工程控制作用评价[D].成都:成都理工大学,2008.Mao Bangyan. Modern Deep Karst Formation Mechanism and Evaluation of Control Action on Crossmountain Tunnel[D]. Chengdu:Chengdu University of Technology,2008.
[5]毛邦燕,吴俊猛,喻洪平,等.沪昆客专黄果树至北盘江段地质选线方案研究[J].铁道工程学报,2011(10):19-24,29.Mao Bangyan,Wu Junmeng,Yu Hongping,etc. Study on Track Alignment in Huangguoshu-Beipanjiang Section of Shanghai-Kunming Passenger Dedicated Line[J]. Journal of Railway Engineering Society,2011(10):19-24,29.
[6]张营旭,张会刚,毛邦燕,等.沪昆客专朱砂堡#2隧道岩溶发育特征与形成机理及工程地质评价[J].路基工程,2017(5):218-222.Zhang Yingxu,Zhang Huigang,Mao Bangyan,etc.Karst Development Features&Forming Mechanism of Zhushabao Tunnel#2 on Shanghai-Kunming PDL and the Engineering Geological Evaluation[J]. Subgrade Engineering,2017(5):218-222.
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