安岳县拱桥乡初级中学崩塌特征、成因机制及稳定性分析

Analysis of Collapse Characteristics,Formation Mechanism and Stability in the Junior Middle School Gongqiao Township,Anyue County

拱桥乡初级中学崩塌位于资阳市安岳县拱桥乡,由公路内侧切坡形成的边坡发展而来,公路开挖致使内侧形成约8米高边坡,边坡高度高、坡度大。边坡物质成分主要为中等风化泥岩夹砂岩,自身稳定性较差,在长年风化剥蚀过程中,软硬岩之间差异风化形成了凹腔。特别是雨季,雨水入渗,增大岩土体容重、减小内部结合力,致使边坡受冲刷而进一步变形失稳,发生规模不等的崩塌,并导致不稳定边坡后缘逐渐向边坡内侧拱桥乡初级中学靠近,威胁学校及下方公路安全。

The collapse of Gongqiao Township Junior Middle School is located in Gongqiao Township,Anyue County,Ziyang City,developed from the side slope formed by the cut slope on the inside of the highway,the excavation of the road resulted in the formation of a slope about 8 meters high on the inside,the slope is high and steep.The material composition of the slope is mainly moderately weathered mudstone interbedded with sandstone,and its stability is poor,in the process of weathering and denudation for years,cavities are formed by weathering differences between hard and soft rocks.Especially during the rainy season,when the water seeps in,,With the increase of soil density and the decrease of internal binding force,the slope is further deformed and destabilized by erosion,the collapses occurred.The back edge of the unstable slope gradually approaches the inner side of the slope,endangering the safety of the school and the highway below.