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

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.