土地垭隧道洞口滑坡成因及处治方案研究
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摘要
为解决破碎围岩铁路隧道洞口施工引起的工程滑坡问题,依托叙毕铁路土地垭隧道出口滑坡处理工程,对滑坡成因及处治方案进行了研究分析。研究结果表明,隧道洞口滑坡成因主要有内、外2种因素,内因为洞口浅埋段围岩风化严重、破碎,外因为施工开挖造成坡脚临空,地表水下渗恶化围岩,防护措施也未及时施作。在滑坡处治方案设计中,需结合滑坡体范围与隧道相对位置关系,采取针对性处理措施。原则上采取锚固桩加固边仰坡滑坡体并增设截排水沟后,再对隧道范围内采取明洞改路基、基础换填、钢花管注浆加固等措施。
To solve the problem of engineering landslide caused by constructing fractured surrounding rock railway tunnel structural opening, Tudiya tunnel exit landslide treatment engineering of Xuyong to Bijie railways was taken as the engineering background. Landslide cause and treatment scheme were studied. The results showed that tunnel structural opening landslide cause concluded two kinds of factors. The internal cause was that tunnel entrance shallow-buried section surrounding rock was seriously weathered and crushing. The external cause was that construction excavation generated free face at toe of slope, surface water infiltration softened the surrounding rock, and protective measures were not constructed in time. In the design of landslide treatment scheme, it was necessary to take pertinent treatment measures according to the relationship between landslide range and relative position of tunnel. In principle, after anchor piles were adopted to strengthen landslide and intercepting drain or drainage ditch were made, measures should be taken in tunnel range, such as changing gallery with subgrade, changing and filling foundation, steel flower tube grouting reinforcement.
To solve the problem of engineering landslide caused by constructing fractured surrounding rock railway tunnel structural opening, Tudiya tunnel exit landslide treatment engineering of Xuyong to Bijie railways was taken as the engineering background. Landslide cause and treatment scheme were studied. The results showed that tunnel structural opening landslide cause concluded two kinds of factors. The internal cause was that tunnel entrance shallow-buried section surrounding rock was seriously weathered and crushing. The external cause was that construction excavation generated free face at toe of slope, surface water infiltration softened the surrounding rock, and protective measures were not constructed in time. In the design of landslide treatment scheme, it was necessary to take pertinent treatment measures according to the relationship between landslide range and relative position of tunnel. In principle, after anchor piles were adopted to strengthen landslide and intercepting drain or drainage ditch were made, measures should be taken in tunnel range, such as changing gallery with subgrade, changing and filling foundation, steel flower tube grouting reinforcement.
引文
[1] 陈海,刘欢,胡兴尧,等.某隧道进口段滑坡支挡防护方案研究[J].交通科技,2018(3):29-32.
[2] 唐连权,万小乐.隧道洞口段位于滑坡体上的处治方法[J].地质学刊,2018,42(2):328-333.
[3] 王洪坤.隧道下穿大型滑坡体处理技术研究[J].铁道建筑技术,2018(5):77-80.
[4] 穆卉楠.瓦窑沟隧道出口滑坡综合治理技术[J].国防交通工程与技术,2018,16(增刊):51-52,90.
[5] 熊文林.基于FLAC3D的隧道洞口滑坡防治技术优化研究[J].交通科技,2015(4):86-89.
[6] 熊文林.湖北十白高速公路栗石沟隧道洞口滑坡稳定性分析[J].交通科技,2013(6):76-78.
[7] 刘晓勇.瑞坡隧道左幅进口滑坡治理[J].交通科技,2013(1):60-62.
[8] 申梦华,徐仲春.大年岭隧道进口滑坡的综合治理[J].铁道建筑技术,2003(2):22-24.
[9] 元德壬,温博,陈从新,等.彭家湾古滑坡体的破坏机制及处置技术初探[J].武汉理工大学学报(交通科学与工程版),2017,41(2):318-323.
[10] 眭爱宏,邱瑞,朱利保,等.隧道穿越洞口堆积体洞顶居民区施工技术[J].铁道建筑技术,2002(增刊1):26-28.
[11] 孟军芬,陈建.犀牛塘隧道出口滑坡的综合整治[J].铁道建筑技术,1997(3):46-48.
[2] 唐连权,万小乐.隧道洞口段位于滑坡体上的处治方法[J].地质学刊,2018,42(2):328-333.
[3] 王洪坤.隧道下穿大型滑坡体处理技术研究[J].铁道建筑技术,2018(5):77-80.
[4] 穆卉楠.瓦窑沟隧道出口滑坡综合治理技术[J].国防交通工程与技术,2018,16(增刊):51-52,90.
[5] 熊文林.基于FLAC3D的隧道洞口滑坡防治技术优化研究[J].交通科技,2015(4):86-89.
[6] 熊文林.湖北十白高速公路栗石沟隧道洞口滑坡稳定性分析[J].交通科技,2013(6):76-78.
[7] 刘晓勇.瑞坡隧道左幅进口滑坡治理[J].交通科技,2013(1):60-62.
[8] 申梦华,徐仲春.大年岭隧道进口滑坡的综合治理[J].铁道建筑技术,2003(2):22-24.
[9] 元德壬,温博,陈从新,等.彭家湾古滑坡体的破坏机制及处置技术初探[J].武汉理工大学学报(交通科学与工程版),2017,41(2):318-323.
[10] 眭爱宏,邱瑞,朱利保,等.隧道穿越洞口堆积体洞顶居民区施工技术[J].铁道建筑技术,2002(增刊1):26-28.
[11] 孟军芬,陈建.犀牛塘隧道出口滑坡的综合整治[J].铁道建筑技术,1997(3):46-48.