一、工程概况某艺术大厦工程由主楼和裙楼组成。倒塌部份位于[30]-[31]轴和■～■轴之间,属于裙楼地下室一部份(图1),宽7.1m,长31.4m,建筑面积为446m~2。地下室为二层结构,地上尚无结构建筑。基础为大直径扩底桩基,底板厚600mm,底板顶面标高-11.6m。地下室二层层高6.6m,基础顶板标高-0.7m(图2) I. Project Overview An art building project consists of a main building and a podium building. The collapsed section is located between the [30]-[31] axis and the ■■■ axis, which is part of the basement of the podium (Figure 1). It has a width of 7.1m, a length of 31.4m and a building area of ​​446m-2. The basement is a two-story structure and there are no structural buildings on the ground. The foundation is a large diameter enlarged pile foundation, the floor thickness is 600mm, and the top floor elevation is -11.6m. The basement is two stories with a height of 6.6m and the base roof elevation is -0.7m (Figure 2)