摘要
隧道衬砌混凝土因材料缺陷、施工不当和设计疏漏等均可能诱发裂缝,衬砌裂缝的基本预防方法是相应地优选材料、优质施工和精心设计。衬砌裂缝在围岩压力、行车震动和温变应力等的影响下会逐渐发展,若不进行有效控制,裂缝的不断发展会诱发隧道渗漏水,严重时会发展为结构失稳。对于寒冷地区隧道,渗漏水会诱发隧道冻害,温变应力主要表现为更容易致裂的拉应力,因此,衬砌裂缝的设防尤为重要。针对寒冷地区隧道的气温特点和衬砌裂缝成因,提出了尽量隔离各衬砌段以减少其周边约束的防裂措施。
Due to material defects,improper construction and design oversight,concrete of tunnel lining may induce cracks,and the basic prevention methods of cracks are the corresponding preferred materials,quality construction and careful design.The lining cracks will gradually develop under the influence of rock pressure,driving vibration,temperature change stress and so on,if not effectively controlled,continuous development of cracks will cause water leakage,and then it will develop severe structural instability.For cold regions tunnel,the tunnel water leakage will induce freezing,and the main performance of temperature change stress is fracturing tensile stress,therefore,the prevention of tunnel cracks is particularly important.In view of temperature characteristics and causes of lining cracks in cold regions tunnel,the measures against cracks are proposed,which is to isolate various lining sections and to reduce its peripheral restraint as much as possible.
出处
《公路》
北大核心
2012年第10期196-200,共5页
Highway
基金
国家西部交通建设科技项目
项目编号2007 318 812 67
关键词
寒区隧道
衬砌裂缝
温变应力
裂缝预防
tunnel in the cold region
lining crack
temperature change stress
crack prevention
