砂质地基沉井施工对周围环境影响研究

Study on Surrounding Environment Impacted by Caisson Construction of Sandy Foundation

马鞍山发电厂扩建工程循环水泵房采用沉井基础。为了防止沉井施工导致周围结构物和建筑物桩基损坏,在沉井施工过程中进行水位、土体水平位移和桩顶位移监测。监测分析结果表明:土体的水平位移随着深度增大逐渐减小,随距沉井壁距离增大也逐渐减小;同时沉井的尺寸越大,对土体水平位移影响越大;桩基受土体位移影响发生位移并与土体位移保持一致,桩基经检测未发生破坏。

For the circulating water pump house in the expansion project of Ma＇anshan Power Plant, open caisson foundation was applied. In order to prevent damages to the surrounding structures and the pile foundation of the buildings caused by open caisson construction, the water level, horizontal displacement of soil mass and pile top displacement were monitored in the construction. The monitoring and analyzing results show that, the horizontal displacement of soil mass gradually decreases with either the increase of the depth, or the increase of the distance away from the caisson wall; at the same time, the larger size of the caisson, the much influence on the horizontal displacement of soil; under the influence of soil displacement, displacement emerges in pile foundation and keeps consistent with the soil displacement, and through inspection, the pile foundation is found not to be damaged.