中孟单桩竖向抗压承载力确定方法对比

针对中孟两国所用单桩竖向抗压承载能力值确定方法的差异性,将国内外竖向抗压试验设备、试验方法、数据处理方法及单桩竖向承载能力特征值确定方法进行对比,结果表明:静载试验方法与理论计算方法均存在较大差异。依托孟加拉达卡地区电网扩容和升级项目,将孟加拉国使用的循环荷载试验法所确定的单桩竖向抗压承载能力特征值、中标采用经验参数法与孟加拉国采用标贯法确定的单桩竖向抗压承载能力设计值结果进行对比分析,得出中孟两国所用理论计算方法确定的单桩竖向抗压承载能力设计值相近,而理论计算结果相较于孟加拉国项目采用循环荷载试验法确定的单桩竖向抗压承载能力特征值偏小,提出了中孟两国理论计算方法与试验法所得结果之间的转化关系。

Comparative of Determination Methods of Single Pile Vertical Compressive Bearing Capacity between Chinese and Bangladeshi

Aimming at the difference between the method for determining the vertical compressive bearing capacity of a single pile in the Chinese and in Bangladesh, this paper compared the vertical compressive test equipment, test methods, data processing methods and the way to confirm the vertical compressive bearing capacity characteristic value of a single pile at home amd abroad. The results show that there is a big difference between the static load test method and the theoretical calculation method used. This paper, relying on the engineering example of Dhaka Regional Power gird expansion and upgrade project in Bangladesh, compared and analyzed the vertical compressive bearing capacity characteristic value of a single pile determined by the cyclic load test method used in Bangladesh, empirical parameter method used in the Chinese standard with the design value of the single pile vertical compressive bearing capacity determined by the standard penetration method in Bangladesh. It is concluded that the design value of the vertical compressive bearing capacity of a single pile determined by the theoretical calculation method used in China and Bangladesh is similar. However, compared with the characteristic value of vertical compressive bearing capacity of single pile determined by cyclic load test method in Bangladesh project, the result obtained by theoretical calculation method is relatively small. For this reason, the transformation relationship between the results obtained by the theoretical calculation method and the test method is proposed.