摘要
我国西北地区因湿陷性黄土特性,时有引发已完工程基础沉陷现象.以某氧化铝改造项目为例,就对沉降槽系统基础不均匀沉降产生因素进行分析,一是通过工程补勘查明场地岩土性和地基土的承载力,二是复核原灰土垫层地基处理存在的设计问题与缺陷.对此可按照"减沉桩"设计原理,论证采用微型桩加固地基处理方案可靠性;此外,还应依据施工规范及工程经验,明确微型桩施工过程中的注意事项及相应参数.实践表明,通过微型桩加固既有地基,有效阻止了沉降槽基础的沉降,效果显著,可为解决类似工程问题提供借鉴.
Abstract
The characteristics of collapsible loess in northwest China often induce the phenomenon of the foundation subsidence after the completion of the projects.It is of the great practical significance to deal with such hazards on time.This paper pres-ents a case history of the ground improvement work for an alumina factory reconstruction project.The causes of differential set-tlement of the sediment tank system were analyzed.The geotechnical properties of the site and the bearing capacity of the foun-dation soil were identified through the supplementary geotechnical engineering investigation.The design problems and defects existing in the foundation treatment of the original lime soil cushion were reviewed.The reliability of the foundation treatment strengthened by micropiles was demonstrated in accordance with the design principle of"settlement reduction pile";In addi-tion,according to the construction specifications and engineering experience,construction details and corresponding parameters in the construction process of micropile were provided.It showed that reinforcing of the existing foundation with micropile can effectively mitigate the differential settlement issues of sediment tank foundation.
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