汶川地震区路堑重力挡墙震害调查

Investigation on Failure of Side-hill Gravity Retaining Walls in Regions of the Wenchuan Earthquake

中国四川省汶川县2008年5月12日所发生的里氏8.0级强烈地震,具有烈度大、持续时间长的特点,由于发生在山区,地震对山区公路边坡产生了严重的破坏作用,尤其是对路堑边坡的重力式挡墙产生了不同类别的损坏,根据对本次地震极重灾区国道G213都江堰-映秀段路堑边坡重力式挡墙损坏状况的震后全面调查,整理归纳了路堑边坡重力式挡土墙的不同震害特征,主要可以分为墙体开裂、墙体局部破坏、墙体部分节段外倾、墙体部分节段滑移、落石砸坏挡墙这5种破坏类别,统计归纳了墙体震害与墙高、墙体材料、墙体所在位置线路走向与发震断层走向之间的关系等重要因素之间的规律性特征,本文结果可为山区公路工程的抗震设计研究提供基础参考。

On May 12, 2008, an earthquake measuring eight on the Richter scale happened in Wenchuan County, Sichuan Province of China. It is of high intensity and long duration. Occurring in a mountainous area, the earth- quake greatly damaged side-hill retaining walls, and especially gravity retaining walls. From a comprehensive investigation and summary of gravity retaining walls damage conditions on Dujiangyan-Yingxiu section of G213 highway from the disaster area after the earthquake, this paper summarizes five characteristic failure types, namely, wall cracking, partial wall failure, wall segment extraversion, wall segment slip and retaining wall failure by rock-fall. According to statistical and analytical data, it shows that there are some rules between failure characteristics caused by earthquake of gravity retaining walls and height of the walls, materials of the walls, and angle between strike direction of the highway at the location of the walls and that of faults caused the earthquake. The research results of the paper can give important references to anti-seismic countermeasure designs for highway in the mountainous area.