2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 27 某17m深基坑工程综合支护技术 王銮学,王文玲2,纽爱涛2 (1.中广核工程有限公司,广东深圳518031;2.北京博大经开建设有限公司,北京100176) [摘要]某工程深基坑支护长度398m 支护深度约12.9-15.4m.根据工程特点,采取在东、北两侧采用微型柱加 锚索土钉墙支护,在南侧选用两级故坡加土钉墙支护的方式.介绍了基坑支护方案设计,详细介绍了微型桩、土钉 墙及预应力锚杆的施工工艺.位移监测数据显示,基坑支护处于稳定状态,未出现超出设计范围的变形现象. [关键词]深基坑;微型桩;锚索:土钉墙;预应力错索 [中图分类号]TU753.3 [文献标识码]A [文章编号]1002-8498(2011)07-0027-03 Comprehensive Bracing Technology in 17 Meters Deep Foundation Excavation Wang Luanxue' Wang Wenling? Niu Aitao? (1.China Nuclear Power Engineering Co.Ltd.Shenzhen Guangdong 518031 China; 2.Beijing Boda Jingkai Construction Co.Led.Beijing 100176 China) Abstract:The supporting length of some deep foundation is 398 meters and the depth is about 12.9~ 15.4 meters.Based on characteristics of engineering mini piles and anchor soil-nailling wall are used in east and north side meanwhile soil-nailing wall is adopted in south side.Design of foundation excavation supporting is introduced and construction technique of mini piles anchor soil-nailling wall and prestressed anchor are introduced in detail.According to monitoring data foundation excavation is at stable state and deformation is under control. Key words:deep foundation excavation;mini piles;anchor soil-nailing wall;prestressed anchor 1工程概况 场地内混合地下水埋深在3.80-4.90m 根据 本工程位于深圳市某科技园区内,占地面积其赋存介质和埋藏条件分为2类:①赋存于第四系 3580.58m2 总建筑面积77388.59m2 地下4层,深残积砾质粉质黏土及全风化粗粒花岗岩层中的少量 度达17.0m 地上25层,建筑总高度99.55m.本工孔隙水,透水性较差,属弱含水;②赋存于基岩强、 程±0.000相对绝对高程29.95m 基础为桩承台底中、微风化层中的裂隙承压水,其含水量及透水性主 板基础,...