真光中学教学实验楼部分桩基计算与加固

CALCULATION AND REINFORCEMENT OF PART PILES OF LABORATORIAL BUILDING OF ZHENGUANG MIDDLE SCHOOL

真光中学教学实验楼基础采用人工挖孔桩,经过桩基抽芯检测显示,少数桩桩端持力层为强风化岩层,不符合设计要求。后通过补充勘察,进一步查明场地的工程地质条件。根据勘察报告提供的各岩土层的岩土计算参数,经过桩基计算后发现,桩端持力层为强风化岩层的桩单桩竖向承载力不能满足设计要求,因此对桩端持力层为强风化岩层的桩采用压力灌浆法进行补强加固。桩基加固后经过验算,其承载力可满足设计要求,沉降观测结果显示变形符合规范要求,说明采用压力灌浆法进行桩基补强加固是有效的。

The pile foundations with man-made hole in Laboratorial Building of Zhenguang Middle School are used,and part piles that cannot meet the requirements of design are founded to be settled on intensely weathered zone after testing.The supplementary investigations of engineering geology show that the mechanical parameters of soil and rock,and bearing capacity are improper for the design through calculation of pile foundations.So,grouting is employed for the cases,where the bearing capacity of pile foundation can satisfy the requirements of design.The observation settlement shows that the grounding effects can be accepted.The achieved results that the grouting technique is adequate for pile foundation treatment when the pile end is located on intensely weathered zone.