挤压带对偏压隧道边坡稳定性的影响与治理
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摘要
以贵州某高速公路一浅埋偏压连拱隧道为背景,从工程实际出发,结合有限元数值模拟探讨挤压带对偏压隧道边坡稳定性的影响及治理措施。分析结果表明,挤压带对边坡稳定性起到主要控制作用。有限元数值模拟结果显示,由于挤压带的存在,边坡顶部沿挤压带下缘处开裂,这与实际观察结果一致;计算结果还表明,在右硐室、强风化带及挤压带交接处,出现剪应力集中,导致局部剪切破坏,边坡可能沿着此条潜在滑动面失稳。针对挤压带力学性能差以及由此引起强风化带开裂、剪切损伤而导致强度下降的情形,提出了抗滑桩与钢花管注浆共同作用的治理方案。地表注浆有利于提高隧道顶板岩体的完整性和强度,对隧洞施工安全及为重要。
Taking one shallow-embedded and double-arch tunnel in Guizhou Province as the engineering background,the slope stability and harness of unsymmetrically loaded tunnel with effect of compressed zone are discussed by geological investigation and finite element analysis.It proves that compressed zone is main source to control slope stability.The result of numerical analysis demonstrates that the top of slope is cracked because of compressed zone existing,and coincides with in-situ investigation.The shear stress concentration and local shear failure are observed at the joint of right tunnel,strong weathering and compressed zone by numerical analysis,and the slope may slide along the potential slide interface.In order to prevent slope from failure,the slope is rei-nforced by anti-slide pile and injecting grout through steel perforated pipe.Injecting grout can improve the int-egrity and strength of rock mass of tunnel roof.It is especially important to the safe construction of tunnel.
Taking one shallow-embedded and double-arch tunnel in Guizhou Province as the engineering background,the slope stability and harness of unsymmetrically loaded tunnel with effect of compressed zone are discussed by geological investigation and finite element analysis.It proves that compressed zone is main source to control slope stability.The result of numerical analysis demonstrates that the top of slope is cracked because of compressed zone existing,and coincides with in-situ investigation.The shear stress concentration and local shear failure are observed at the joint of right tunnel,strong weathering and compressed zone by numerical analysis,and the slope may slide along the potential slide interface.In order to prevent slope from failure,the slope is rei-nforced by anti-slide pile and injecting grout through steel perforated pipe.Injecting grout can improve the int-egrity and strength of rock mass of tunnel roof.It is especially important to the safe construction of tunnel.
引文
[1]杨小礼,眭志荣.浅小净距偏压隧道施工工序的数值分析计算[J].中南大学学报:自然科学版,2007,38(4):764-770.
[2]林刚,何川.连拱隧道施工全过程地层沉降三维数值模拟[J].公路,2004,(3):136-140.
[3]王国欣,谢雄耀,黄宏伟.公路隧道洞口滑坡的机制分析及监控预报[J].岩石力学与工程学报,2006,25(2):268-274.
[4]王祥秋,杨林德,高文化.高速公路偏压隧道施工动态监测与有限元仿真模拟[J].岩石力学与工程学报,2005,24(2):284-289.
[5]陈东瑞.隧道边坡治理方案设计与施工[J].铁道建筑,2006,(3):45-48.
[6]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738-743.
[2]林刚,何川.连拱隧道施工全过程地层沉降三维数值模拟[J].公路,2004,(3):136-140.
[3]王国欣,谢雄耀,黄宏伟.公路隧道洞口滑坡的机制分析及监控预报[J].岩石力学与工程学报,2006,25(2):268-274.
[4]王祥秋,杨林德,高文化.高速公路偏压隧道施工动态监测与有限元仿真模拟[J].岩石力学与工程学报,2005,24(2):284-289.
[5]陈东瑞.隧道边坡治理方案设计与施工[J].铁道建筑,2006,(3):45-48.
[6]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738-743.
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