摘要
以遂渝铁路松软地基为工程背景,原位测试了铺设与不铺设土工格栅两种情况的粉喷桩复合地基的剖面沉降、桩顶和桩间土的土压力、土工格栅拉力。分析结果表明:桩顶和桩间土的土压力与填土高度成正比,铺设土工格栅能有效改善附加应力的传递,提高桩土应力比,粉喷桩+土工格栅加筋垫层复合地基的桩土应力比为3.75。土工格栅的拉力与沉降成幂函数关系。分析结果对的粉喷桩桩网复合地基设计有重要参考价值。
In a test sector of soft ground on the 200 km/h mixed passenger and freight railway from Suiling— Chongqing,the settlement of the composite ground with the dry jet mixing(DJM) piles reinforced by the geogrid,and the stress on the DJM piles and the ground soil as well as the tensile force of the geogrid were measured to study the reinforcement effect of the geogrid on the composite ground with the DJM piles.As shown by the test,the stresses on the piles and the soil were increased with the height of the embankment linearly.The tensile forces of the geogrid were changed along with the settlement exponentially.Compared to the composite ground with the DJM piles without geogrid,the settlement of the composite ground with the DJM piles reinforced by the geogrid were reduced by 30%–65%,and the stress ratio between the piles and the soil was 3.75.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z1期3162-3167,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
铁道部重点资助项目(2004G24)
关键词
基础工程
粉喷桩
复合地基
土工格栅
加筋
foundation engineering
dry jet mixing(DJM) piles
composite foundation
geogrid
reinforcement
作者简介
曹新文(1966-),男,1987年毕业于华中工学院力学系,现任副教授,主要从事路基工程、地基处理方面的教学与研究工作.E-mail:caoxinwen@home.swjtu.edu.cn
