长安大学地质科技大厦南侧基坑倒塌事故分析与处理

ANALYSIS AND TREATMENT OF COLLAPSE ACCIDENT ON THE SOUTH SIDE OF FOUNDATION PIT FOR GEOLOGICAL SCIENTIFIC BUILDING IN CHANG'AN UNIVERSITY

某基坑南侧支护工程原采用土钉墙支护,在土钉墙施工过程中,因遇连续降雨,靠近基坑南侧边坡处的地下排水管道由于排水不畅而导致雨水倒流进入土钉墙内;加上不规范的施工方法,致使正在施工中的土钉墙及边坡出现大面积的坍塌。针对这一工程事故进行详细地分析计算,在确定事故原因之后,对原设计方案作出调整;重新施工时,改用锚杆与砖墙组合方案。并对黄土地区土钉墙的施工提出了几点建议:注意排水、规范施工、动态设计以及信息化施工。

The original supporting design of the south side of this foundation pit is earthnail retaining wall. During construction of the earthnail retaining wall a poor drainage was caused by continuous rainfall, rain water entered back the earthnail retaining wall through the underground drains near the foundation pit＇s southern slope, together with non-standard construction methods, hence large areas of collapse have occurred in quite a few earthnail retaining wall and slope under construction. It was carried out a detailed analysis of the project incidents. After determining the cause of the accident, it was adjusted the original design scheme i.e. the scheme of anchor and brick wall composite structure was used. And a few of advice is provided for the construction of the earthnail retaining wall in loess region, such as attention to drainage, standard and informational construction, dynamic design.