偏压连拱隧道病害分析及治理措施
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摘要
基于某高速公路偏压连拱隧道衬砌发生严重破坏和隧道上方发生较大规模的山体开裂等病害,采用地震CT手段对隧道周围的工程地质进行了探测;根据现场监测数据,分析了隧道支护结构的受力状态及其安全性;对复杂地质条件下两种典型的施工方案进行了动态施工的数值模拟,对比分析了不同施工方案对围岩稳定和衬砌受力的影响;探讨了衬砌发生严重破坏的原因,并提出了相应的治理措施。研究结果表明:连拱隧道内侧断裂带、上方松散层等不良地质条件和不合理的施工方案是导致隧道衬砌严重破坏和山体地表开裂的主要原因。研究结果为分析和治理偏压连拱隧道病害提供了依据。
Based on severe cracks induced on linings and surface clefts on the mountain in some freeway arcade tunnel with partial pressure,firstly,seism CT method was adopted to detect the engineering geology around the tunnel; secondly,the tunnel lining's stress state and safety were analyzed according to the in situ monitoring data;thirdly,two typical staged construction projects under the complicated geology conditions obtained by seism CT were numerically simulated and their influences on the rock stability and lining's stress were compared;finally,main causes to induce these defects were further discussed,and some corresponding treating measurements were put forward.The research results indicate that the top inclined fault and the loose rock strata and the unreasonable construction project are the main causes to induce these defects.The results provide theory for treating these defects in the freeway arcade tunnel.
Based on severe cracks induced on linings and surface clefts on the mountain in some freeway arcade tunnel with partial pressure,firstly,seism CT method was adopted to detect the engineering geology around the tunnel; secondly,the tunnel lining's stress state and safety were analyzed according to the in situ monitoring data;thirdly,two typical staged construction projects under the complicated geology conditions obtained by seism CT were numerically simulated and their influences on the rock stability and lining's stress were compared;finally,main causes to induce these defects were further discussed,and some corresponding treating measurements were put forward.The research results indicate that the top inclined fault and the loose rock strata and the unreasonable construction project are the main causes to induce these defects.The results provide theory for treating these defects in the freeway arcade tunnel.
引文
[1]刘庭金,朱合华,夏才初,等.云南省连拱隧道衬砌开裂和渗漏水调查结果及分析[J].中国公路学报,2004,17(2):64—67.
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[3]陈少华,李勇.联拱隧道的结构分析[J].中国公路学报,2000,13(1):48—51.
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[5]周玉宏,赵燕明,程崇国.偏压连拱隧道施工过程的优化研究[J].岩石力学与工程学报,2002,21(5):679—683.
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[2]何振起,李海,梁彦忠.利用地震发射法进行隧道施工地质超前预报[J].铁道工程学报,2000,17(4):81—85.
[3]陈少华,李勇.联拱隧道的结构分析[J].中国公路学报,2000,13(1):48—51.
[4]卢耀宗,杨文武.莲花山大跨度连拱隧道施工方法研究[J].中国公路学报,2001,14(2):75—77.
[5]周玉宏,赵燕明,程崇国.偏压连拱隧道施工过程的优化研究[J].岩石力学与工程学报,2002,21(5):679—683.
[6]夏才初,刘金磊.相思岭连拱隧道中隔墙应力研究[J].岩石力学与工程学报,2000,19(增):1 115—1 119.
[7]刘庭金,朱合华,丁文其.某高速公路隧道二次衬砌结构安全性分析[J].岩石力学与工程学报,2004,23(1):75—78.
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