深厚回填土地基储罐群不均匀沉降原因分析及纠偏加固处理  

Analysis of differential settlement and corrective reinforcement of tanks on deep backfill soil foundation

作　　者：田龙龙 梁学琴 TIAN Long-long;LIANG Xue-qin(China Petroleum Engineering&Construction Corp.,Beijing Company,Beijing 100085,China;CRCC Cyber Information Technology Co.,Ltd.,Beijing 100043,China)

机构地区：[1]中国石油工程建设有限公司北京设计分公司,北京100085 [2]中铁建网络信息科技有限公司,北京100043

出　　处：《地基处理》2022年第5期414-422,450,共10页Journal of Ground Improvement

摘　　要：依托某深厚回填土地基储罐群加固和纠偏处理工程,结合地基变形特征,通过综合分析工程地质条件、场平回填质量和强夯处理等资料,探讨了该地基沉降变形的原因。针对储罐环墙式柔性基础,提出了一种高压旋喷桩帷幕结合钢花管注浆加固和顶升纠偏的处治思路,给出设计方案、关键施工技术和信息化动态控制方法。结果表明,地基沉降量过大和不均匀沉降与黏性素填土高压缩性、分布不均匀性、胀缩特性以及区域地下水位的变化等因素相关。钢花管注浆加固及顶升纠偏方法的工艺特点是“围、挤、压、顶”,先将灌浆区域围住,再在建筑物周边插入直孔及斜孔灌浆挤密地基土,同时通过增加上部荷载,逐步压实地基,最后采用控制性压力注浆顶升。结合实时监测数据阐述了劈裂加固灌浆、充水预压、顶升纠偏灌浆、稳压固结和卸荷回弹五个连续阶段的动态控制方法。The reinforcement and rectification treatment of a storage tank group founded on deep backfill soil foundation is discussed in this paper.Based on the characteristics of foundation deformation,the geological conditions,and the quality of backfill soil and dynamic compaction treatment,the causes of settlement were studied.For the flexible foundation of the storage tanks with ring wall,a treatment idea of high pressure rotary-jet grouting pile curtain combined with steel pipe grouting was proposed,and the design scheme,key construction technology and dynamic information control method were given.The results show that the excessive subsidence and uneven settlement are related to factors such as the high compressibility,the uneven distribution,the expansion and shrinkage characteristics of the clay fill and the change of regional groundwater level.The technical characteristics of steel pipe grouting reinforcement and jacking correction method are‘encircling,squeezing,pressing and roofing’.The grouting area was first surrounded,and then straight holes and inclined holes were inserted around the building to squeeze the foundation soil.At the same time,the foundation was gradually compacted by increasing the upper load.And finally the controlled pressure grouting was used to jacking.Combined with the monitoring data,the dynamic control method was expounded from five successive stages:splitting reinforcement grouting,water filling preload,lifting rectification grouting,stabilizing consolidation and unloading rebound.

关 键 词：回填土 储罐群 不均匀沉降 注浆加固 顶升纠偏 

分 类 号：TU472[建筑科学—结构工程]