混合花岗岩的工程性质及其对管桩施工的影响

Engineering Properties of Mixed Granite and Its Influence on Pipe Pile Construction

基于深圳大铲湾地区的工程实例,分析了全、强风化混合花岗岩岩性不均、矿物成分变化大及水敏性等工程性质,再根据加密进行的现场标准贯入试验,推测出全、强风化混合花岗岩纵向风化不均和差异风化现象明显的特征,结合试桩情况分析了该特征对静压管桩压入深度的影响,同时也说明了类似工程静压管桩施工前进行试桩工作的必要性。

Based on the engineering example in the Dachanwan area of Shenzhen,analyzed the engineering properties of fully and strongly weathered mixed granite,such as uneven lithology,significant changes in mineral composition,and water sensitivity.Then,based on encrypted on-site standard penetration tests,inferred the phenomenon of differential weathering was obvious.Combined with the pipe pile test,analyzed the influence of this feature on the depth of static pressure pipe pile pressin,and explained the necessity of conducting test pile work before the construction of static pressure pipe piles in similar projects.