深圳地区旋挖灌注桩竖向抗压承载力试验案例分析

Case study of vertical compressive bearing capacity tests on swivel-driven piles in Shenzhen area

深圳后海地区基岩为花岗岩,受地质构造影响风化极不均匀,各风化层厚度及埋深相差较大,给工程桩选型及施工造成很大困扰。尤其采用以强风化为桩端持力层的端承–摩擦型桩,单桩竖向抗压承载力特征值差异较大。结合该区2项基础桩工程实例,对22根桩的单桩竖向承载力静载试验结果进行分析,试图找出单桩竖向承载力的特性规律,为该区其他工程基础桩设计和施工提供参考。

The bedrock in Houhai area of Shenzhen is granite. The granite weathering affected by the geological structure is very uneven, so the depth and thickness of weathered layers have large differences and may bring great troubles to the selection and construction of piles. Especially for end-support friction piles with strong weathering for bearing course at piles, the characteristic values of vertical compressive bearing capacity tests on single pile are quite different. Based on the 2 foundation pile project instances, the results of static load tests on vertical bearing capacity of 22 piles are analyzed in order to find out the characteristics of the vertical bearing capacity of single pile. It may provide the reference for the design and construction of other foundation piles.