为满足城市建设的需要，高层大厦不断地涌现出来。在密集的建筑群中经常要进行打桩施工，由于桩基对软土的挤压作用，常导致周围建筑物、地下管线、道路路面等开裂破坏。尤其在上海地区，地属长江流域的冲积平原，在距地表40m范围内的地层构造中，除地表是3m深的填土和粘土外，以下大部分均为深 To meet the needs of urban construction, high-rise buildings are constantly emerging. Piling construction is often carried out in dense buildings. Due to the effect of pile foundations on the soft soil, cracking of surrounding buildings, underground pipelines, and road pavements is often caused. Especially in the Shanghai area, the alluvial plains of the Yangtze River basin belong to the stratigraphic structure within a distance of 40m from the surface. Except for the surface is 3m deep soil and clay, most of the following are deep.