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兰州维尼纶厂位于西北黄土高原,地基土为Ⅰ～Ⅱ级自重湿陷性黄土。该厂有机化工车间占地面积约4万平方米,1979年6月试车投产。由于废水排放和降雨的影响,很快发生大面积地基下沉,很多设备基础也开始下沉、倾斜。该车间地坪按一般防水地坪设计,原土夯实后打2:8灰土一步,灰土上做80毫米厚150号混凝土。与湿陷性黄土规范有关条款的规定相比,设计标准偏低,湿陷性黄土地基处理的深度不够,上部防水层的做法较简单,从而导致地基下沉。在车间各种设备、管线已经安装完毕的
Lanzhou Vinylon Factory is located on the Loess Plateau in the northwest and the foundation soil is Grade I-II self-heavy collapsible loess. The plant’s organic chemical workshop covers an area of about 40,000 square meters and was commissioned in June 1979. Due to the impact of wastewater discharge and rainfall, large-scale ground subsidence quickly occurred, and many equipment foundations began to sink and tilt. The floor of the workshop is designed as a general waterproof floor. After the original soil is compacted, it is grounded with a step of 2:8 lime soil. On the grey earth, it is made of concrete 150 mm thick. Compared with the provisions of the relevant provisions of collapsible loess, the design standards are low, and the depth of treatment of collapsible loess foundations is not enough. The practice of the upper waterproof layer is relatively simple, resulting in subsidence of the foundation. In the workshop, various equipment and pipelines have been installed