采空区沉陷对运营隧道结构的影响
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摘要
为了评价采空区沉陷对运营隧道结构的影响,通过对运营隧道变形现场调查及原因分析,结合采动评估模型,对运营隧道结构变形进行研究。结果表明:隧道病害的主要原因是地表沉陷和水平位移,开采过程中会出现衬砌拉伸开裂、变形缝挤死、混凝土崩落、拱顶脱皮等危害性变形,应做好监测工作,设置变形缝;对部分二次初衬应做配筋;对隧底部分冒落带和导水裂缝带围岩进行注浆加固,可有效减少对隧道结构的影响。
In order to evaluate the influence of goaf subsidence on the structure of operational tunnel,combined with mining evaluation model,the structural deformation of the operational tunnel was studied through the field investigation and cause analysis of the deformation of the operational tunnel.The results show that the main causes of tunnel diseases are surface subsidence and horizontal displacement.During the mining process,there will be harmful deformation such as tension crack of lining,extrusion of deformation joint,concrete caving,vault decortication,etc.Therefore,monitoring work should be done,deformation joints should be set up and reinforcement should be made for some secondary initial linings.Besides,grouting reinforcement of the surrounding rock of the caving zone and the water flowing fractured zone which is at the bottom of the tunnel can effectively reduce the impact on tunnel structure.
In order to evaluate the influence of goaf subsidence on the structure of operational tunnel,combined with mining evaluation model,the structural deformation of the operational tunnel was studied through the field investigation and cause analysis of the deformation of the operational tunnel.The results show that the main causes of tunnel diseases are surface subsidence and horizontal displacement.During the mining process,there will be harmful deformation such as tension crack of lining,extrusion of deformation joint,concrete caving,vault decortication,etc.Therefore,monitoring work should be done,deformation joints should be set up and reinforcement should be made for some secondary initial linings.Besides,grouting reinforcement of the surrounding rock of the caving zone and the water flowing fractured zone which is at the bottom of the tunnel can effectively reduce the impact on tunnel structure.
引文
[1]方勇,符亚鹏,周超月,等.公路隧道下穿双层采空区开挖过程模型试验[J].岩石力学与工程学报,2014,33(11):2247-2257.
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[14]李治国.铁山隧道采空区稳定性分析及治理技术研究[J].岩石力学与工程学报,2002,21(8):1168-1173.
[15]廖沛源,郑国强,袁松.采空区地层变形产生的隧道附加荷载及变形容许值计算与分析[J].现代隧道技术,2013(3):72-78.
[16]梁建平,王树仁,曹海莹.穿越采空区公路隧道地表沉陷变形预测分析[J].路基工程,2009(3):30-32.
[2]崔戈,方勇,徐晨,等.公路隧道下穿3层采空区施工模型试验研究[J].岩土力学,2014(S2):257-266.
[3]刘建海.采空区隧道结构稳定性分析[J].公路,2014(5):30-36.
[4]尹士献,李德海.采空区剩余变形对运煤隧道稳定性数值模拟[J].河南理工大学学报(自然科学版),2013,32(5):540-545.
[5]王树仁,慎乃齐,张海清,等.下伏采空区高速公路隧道变形特征数值分析[J].中国矿业,2008(3):76-79,81.
[6]王少斌.柏树底铁路隧道地下采空区稳定性分析[J].铁道建筑,2005(12):32-34.
[7]李晓红,姜德义,刘春,等.公路隧道穿越采空区治理技术研究[J].岩土力学,2005(6):910-914.
[8]李晓红,靳晓光,卢义玉,等.西山坪隧道穿煤及采空区围岩变形特性与数值模拟研究[J].岩石力学与工程学报,2002,21(5):667-670.
[9]姚宣成,高永涛,苏建军,等.隧道下伏采空区稳定性及治理方案数值模拟[J].金属矿山,2014(2):142-145.
[10]黄磊,卢义玉,粟登峰,等.公路隧道穿越急倾斜采空区的治理技术[J].公路交通科技,2012(11):80-85.
[11]何杰,苏伟,唐举一.通平高速公路峨公岩隧道洞顶采空区处治[J].公路工程,2011(4):153-154,178.
[12]王联.西山坪隧道隧底煤层采空区的整治[J].现代隧道技术,2007(6):74-76.
[13]张志沛,覃羡安,刘旭.隧道在煤层采空区的治理方法[J].公路,2005(8):176-179.
[14]李治国.铁山隧道采空区稳定性分析及治理技术研究[J].岩石力学与工程学报,2002,21(8):1168-1173.
[15]廖沛源,郑国强,袁松.采空区地层变形产生的隧道附加荷载及变形容许值计算与分析[J].现代隧道技术,2013(3):72-78.
[16]梁建平,王树仁,曹海莹.穿越采空区公路隧道地表沉陷变形预测分析[J].路基工程,2009(3):30-32.