粤西花岗岩分布区建筑基础选型研究

STUDY OF SELECTION OF BUILDING FOUNDATION IN GRANITE AREA OF WEST GUANGDONG

以粤西花岗岩残积土为研究对象,研究花岗岩残积土中球状风化体的分布规律,以及残丘裸露型花岗岩残积土区建筑基础案例。在案例中分别研究了钻孔灌注桩基础、天然地基基础及人工挖孔灌注桩基础施工遇花岗岩球状风化体的具体处理措施,表明在残丘裸露型花岗岩残积土区建筑场地,采用天然地基基础具有明显的优势,在桩基础中采用人工挖孔灌注桩基础有利于爆破挖除球状风化体,同时可利用较大的球状风化体作桩端持力层。合理避让或利用花岗岩球状风化体,达到既安全又提高经济效益的目的。

In the paper, based on the granite residual soil in the west of Guangdong , the distribution of granite residual soil and weathered globular body were studied, as well as the monadnock of bare granite residual soil zone building foundation case. In the case, the special schemes of bored pile foundation, the natural foundation and artificial digging pile foundation were analyzed when facing the spherical weathering granite. The results showed that it is better to use the natural foundation in this situation where has monadnock of bare granite residual soil zone construction. It can excavate the weathered globular body, if we use artificial digging hole pile foundation in the pile foundation. Meanwhile, there is the advantage of larger spherical weathering as bearing layer of pile tip. It is safe and economical to avoid or using spherical weathering granite body.