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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5mm,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。
For the large tonnage pile static load test, the capacity of foundation soil, testing equipment and construction safety of the three indispensable. The adoption of the overhead hand-held cantilevering method can effectively reduce the stacking height and reduce the tilting and overturning of the platform caused by the uneven foundation settlement. Through the real-time monitoring, although the foundations under piling treatment have considerable settlement, the settlement is even, and they are basically concentrated in the pile-loading process. The settlement of the foundation tends to be stable after the pile is put to rest for a period of time. During the test, the settlement of the reference pile is less than 5 mm, which has little effect on the pile settlement data. The test pile settlement is credible. For large tonnage loading test, it is very difficult to reach or exceed the center distance between the test pile and the pressure platform abutment side and the reference pile, which is worth further study on the fully treated foundation.