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江苏南通天生港电厂扩建区的地基土主要是轻亚粘土和粉砂,设计荷重25t/m~2,用碎石桩加固。本文记述现场试验结果和建筑物的沉降观测。现场试验包括:①面积3×3m的大型载荷试验;②作用在桩上和土上的应力测定;③制桩时引起的地面水平向振动速度与离振点距离之间的关系的确定;④地基土在制桩前后的标准贯入击数的变化。目前,建筑物的平均沉降最为3～10cm,地基的固结度多数已在80％以上,建筑物和设备基础没有出现任何不良现象。
The foundation soil of Jiangsu Nantong Tianshenggang Power Plant expansion area is mainly light sub-clay and silt, and the design load is 25t/m~2, reinforced with gravel piles. This article describes the results of field tests and settlement observations of buildings. Field tests include: (1) Large-scale load tests with an area of 3 × 3m; (2) Measurement of stress acting on piles and soil; (3) Determination of the relationship between ground horizontal vibration speed and distance from the vibration point caused by making piles; 4 The change of the standard penetration number before and after the foundation soil is piled. At present, the average settlement of buildings is the most 3 to 10cm, and the consolidation degree of foundations is mostly above 80%. There are no adverse phenomena in the buildings and equipment foundations.