土岩组合地基注浆加固方案研究  

Research on Grouting Reinforcement in Soil-rock Composite Ground

作　　者：黄楚彬 张后登 胡可宁 姜开渝 Huang Chubin;Zhang Houdeng;Hu Kening;Jiang Kaiyu(China Construction Third Engineering Bureau Co.Ltd.,Wuhan,430000,China;CCCC Second Harbour Engineering Company Ltd.,Wuhan 430000,China;Yichang Construction Market and Quality Safety Supervision Station,443000,China;School of Civil Engineering Southeast University Nanjing,210096,China)

机构地区：[1]中建三局投资发展公司,武汉430000 [2]中交第二航务工程局有限公司,武汉430000 [3]宜昌市建筑市场和质量安全监督站,443000 [4]东南大学土木工程学院,南京210096

出　　处：《特种结构》2020年第2期40-45,共6页Special Structures

摘　　要：浅埋式锚碇基础的持力层通常为土岩组合地基,锚碇基础在自重和主缆拉力作用下易产生不均匀沉降,因此需对地基进行加固处理。以伍家岗长江大桥浅埋式锚碇工程为背景,在锚碇前趾和后趾区域开展现场注浆工艺试验、平板载荷试验,同时结合基底土体的颗粒级配试验分析,划分了前趾和后趾区域的范围,确定了前趾和后趾区域的注浆间距分别为3m和2m,在此基础上最终确定了注浆加固方案的相关参数。研究结果表明:1)注浆后的地基承载力基本容许值和变形模量均有提高,但注浆效果具有较大的离散性;2)基于最终的注浆参数施工,可满足地基处理的设计和施工要求。The Soil-rock composite ground is usually the bearing stratum of shallow-buried anchorage foundation(SBAF).The anchorage foundation in this type of ground is liable to uneven settlement under the action of its self-weight and main cable tension.Therefore,ground improvement is required.In this paper,the SBAF of Wujiagang Yangtze River was taken as an example.Based on in-situ grouting tests,plate loading tests and particle gradation tests,the heel and toe areas are defined and the grouting spaces are set to be 3m and 2m respectively for the heel and toe areas.Based on this,other final grouting parameters for construction are all determined.This study results show that:1) Allowable bearing capacity and deformation modulus of foundation after grouting are improved,however the grouting effect has a large dispersibility;2) Construction based on the final grouting parameters can meet the design and construction requirements of foundation treatment.

关 键 词：土岩组合地基 注浆加固 现场试验 锚碇基础 浅埋式 

分 类 号：U445.55[建筑科学—桥梁与隧道工程]