超深地基超大荷载自反力静载试验方法研究

Research on Self-reaction Static Loading Test for Super Deep Foundation Under Extremely Large Loading

依托贵阳花果园双子塔项目,在试验场地有限的情况下,优化试验顺序,研究出单孔内分别完成深层平板试验、侧摩阻力试验及原尺寸模型桩试验的超大荷载、超深地基自反力静载试验方法,详细介绍了此试验方法的原理、工艺流程,简要介绍了试验结果。此方法的试验结果既能为贵州类似地质条件积累数据资料,其中的原尺寸模型试验又能为本项目提供不同岩性、不同嵌岩深度下桩基的真实承载力值,为设计团队的桩基优化提供依据。

Based on the project of a super high-rise dual-tower building structure in Guiyang, a stepwise test procedure was developed and carried out to obtain the pile capacity because of the limitation of experimental equipment and the complicate geological conditions. The deep plate test, side friction test, and an in-situ test of full-scale pile were all carried out in the same hole. The equipment and procedure of the stepwise test were described in details. The test results were meaningful to provide reference values for investigating mechanical behaviour of pile and statistical analysis of pile capacity in the typical karst geology in Guizhou. Since such a large-scale field test in Guizhou is limited, some recommendation values were also given to engineers for the pile foundation design in this district.