土工基础

›› 2016, Vol. 30 ›› Issue (5): 611-614.

• 工程实录 • 上一篇    下一篇

软土地区超大吨位基桩堆载试验地基沉降特性研究

郑 贺，张忠泽，秦志君   

  1. （徐州市建设工程检测中心，江苏徐州 221000）
  • 收稿日期:2016-04-15 修回日期:2016-05-04 出版日期:2016-10-20 发布日期:2016-10-31
  • 作者简介:郑 贺（1984-），男，硕士，工程师，研究方向为地基基础检测。

Ground Settlement in Soft Soils Due to the Very Large Pile Static Loading Tests with Dead Weights

ZHENG He, ZHANG Zhongze, QIN Zhijun   

  1. (Xuzhou Construction Engineering Testing Center, Xuzhou 221000)
  • Received:2016-04-15 Revised:2016-05-04 Online:2016-10-20 Published:2016-10-31

摘要： 对于超大吨位堆载静载试验，地基土承载力、检测设备能力和施工安全三者缺一不可。采用头顶手提悬挑的方式，可以有效减小码垛高度，减小因地基不均匀沉降造成的平台倾斜、倾覆现象发生。通过实时监测，支墩下经过打桩处理的地基虽然产生可观的沉降，但沉降均匀，且基本集中在堆载过程中，堆载完成静置一段时间后地基沉降基本趋于稳定。测试过程中基准桩沉降不足5 mm,对桩沉降数据影响不大，测试得到的桩沉降是可信的。对于超大吨位堆载试验，试桩、压重平台支墩边和基准桩之间的中心距离很难达到或超过3D，对经充分处理后的地基，该距离值得深入研究。

关键词: 超大吨位, 静载试验, 地基处理, 沉降监测, 距离

Abstract: The bearing capacity of ground soils, the maximum output of the testing equipment and testing safety are the integral parts of a successful very large pile static loading test with dead weights. If the loading program can use the combination of stocking and hanging with cantilever beams, the height of the stocking can be effectively reduced so that the potential tilting and overturning induced by the differential settlement of the ground. The monitoring results indicate that, although large settlements are observed at the loading supporting piers, the settlements are even due to the pile supported piers. The settlement pattern approaches stable immediately after the loading. The settlement at the reference pile was less than 5 mm and has minor impact on the loading data. Usually, for the large static loading test, distances among the test pile, side pier of the loading platform as well as the reference pile are very difficult to meet the 3D requirement.

Key words: Large Loadings, Static Loading Test, Soil Improvement, Settlement Monitoring, Distance