15000kN·m能级强夯置换处理软弱地基效果分析  

Treatment effect analysis of 15000 kN·m energy-level dynamic replacement method on soft foundation

作　　者：付志华 FU Zhi-hua(China Railway 19th Bureau Group First Engineering Co., Ltd., Liaoyang 111000, China)

机构地区：[1]中铁十九局集团第一工程有限公司,辽宁辽阳111000

出　　处：《水运工程》2017年第1期169-176,共8页Port & Waterway Engineering

基　　金：中国石油工程建设公司科学研究与技术开发项目(CPECC2011KJ22)

摘　　要：依托广西钦州港区某地基处理工程,基于夯前夯后多道瞬态面波测试和夯后动力触探试验、置换墩着底检测及静载荷试验,对15000kN·m能级强夯置换法处理软弱地基效果进行了检测。检测结果表明:强夯置换后,地基承载力明显提高,复合地基承载力大于200kPa,压缩模量大于20MPa;15000kN·m能级强夯置换有效加固深度7.0~10.0m,平均有效加固深度9.0m左右;强夯置换后,置换墩体与墩间土间、强夯置换区与周边的强夯区间均存在明显的不均匀性,设计时应充分考虑到强夯置换后地基土的不均匀性。Depending on the one foundation treatment engineering in Qinzhou port, we detected the treatment effect of 15000 kN.m energy-level dynamic compaction replacement method on soft foundation based on some tests. The tests are muhi-channel transient surface wave test before and after dynamic replacement, dynamic penetration test and bottom condition of replacement piers and static load test after dynamic replacement.Some conclusions have been drawn.Firstly, the bearing capacity of foundation was improved after dynamic replacement.The bearing capacity was larger than 200 kPa with compression modulus larger than 20 MPa.Secondly, the effective reinforcement depth of 15 000 kN.m energy-level dynamic replacement was about 7.0 m to 10. 0 m and average effective reinforcement depth was about 9.0 m.Finally, after dynamic replacement, there existed non-uniformity between replacement piers and soil among piers. And there existed non-uniformity between dynamic replacement zone and surrounding compaction zone.Therefore, non-uniformity of foundation soil after dynamic replacement should be fully considered during building design.

关 键 词：软弱地基土 强夯置换 15 000 kN·m能级 处理效果 

分 类 号：TU472[建筑科学—结构工程] U655[建筑科学—土工工程]