我院为上海地区电厂桩基设计做了不少工作,积累了一定的工程经验。在以往的电厂桩基设计中,大多以地面下埋深25～30米的一层晚更新统(Q_s)暗绿色硬粘土层作为桩基持力层。随着电力规模的不断发展,建筑物的上部荷重越来越大,要求进一步提高单桩承载力,以降低桩基的沉降和差异沉降,因此,该持力层已不能满足桩基设计和运行的需要。根据上海几个电厂和其他重要建筑物的勘测、设计和运行的经验来看,穿过暗绿色硬粘土层, Our institute has done a lot of work for the foundation design of power plants in Shanghai, and has accumulated some engineering experience. In the conventional design of power plant pile foundations, a dark green hard clay layer of the Late Neogene (Q_s) with a depth of 25 to 30 meters below the ground was used as the pile foundation bearing layer. With the continuous development of electric power, the load on the upper part of the building is getting larger and larger. It is required to further increase the bearing capacity of the single pile to reduce the settlement and differential settlement of the pile foundation. Therefore, the bearing layer can no longer meet the design and operation of the pile foundation. Needs. According to the experience of surveying, designing, and operating several power plants and other important buildings in Shanghai, they passed through the dark green hard clay layer.