地层空洞注浆加固施工方案最终版

北京地铁15号线一期工程07标段

（俸伯站及站东明挖区间）

地层空洞注浆加固施工方案

编制： 复核： 审核：

中铁隧道集团有限公司

北京地铁15号线一期工程07标项目经理部

2010年03月

北京地铁15号线一期工程07标段

俸伯站及站东明挖区间地层空洞注浆加固施工方案 目 录

第一章 编制依据和原则 ··································································································· 2

1.1编制依据 ············································································································· 2 1.2编制原则 ············································································································· 2

1.2.1应急抢险原则 ······························································································ 2 1.2.2工期保障原则 ······························································································ 2 1.2.3技术可靠性原则 ··························································································· 2 1.2.4经济合理性原则 ··························································································· 2 1.2.5环保原则 ···································································································· 2 1.2.6人文施工的原则 ··························································································· 2

第二章 工程简况 ············································································································ 3

2.1工程概况 ············································································································· 3 2.2设计概况 ············································································································· 3 2.3目前施工情况 ······································································································· 3 2.4基坑周边地层情况 ································································································· 3 第三章 空洞处理方案 ······································································································ 5

3.1处理措施 ············································································································· 5 3.2施工准备 ············································································································· 5

3.2.1劳动力准备 ································································································· 5 3.2.2机械准备 ···································································································· 5 3.2.3材料准备 ···································································································· 5 3.2.4技术准备 ···································································································· 6 3.2.5管理人员组织及责任分工 ··············································································· 6 3.3施工工艺流程 ······································································································· 7 3.4施工方法 ············································································································· 7

3.4.1注浆参数 ···································································································· 7 3.4.2地上钻孔注浆 ······························································································ 7 3.4.3基坑内插孔注浆 ··························································································· 8 3.4.4 注浆注意事项 ··························································································· 10 3.4.5降水井的保护 ···························································································· 10

第四章 质量保证措施 ···································································································· 11

4.1质量保证体系 ····································································································· 11 4.2质量保证措施 ····································································································· 11 4.3技术管理体系 ····································································································· 11 4.4工程检查制度 ····································································································· 11 4.5原材料质量保证措施 ···························································································· 11 第五章 安全技术保证措施 ······························································································ 13

5.1管理、组织保障体系 ···························································································· 13 5.2施工现场安全保证措施 ························································································· 13 第六章 文明施工及环保措施 ··························································································· 15

6.1文明施工管理体系 ······························································································· 15 6.2现场文明施工措施 ······························································································· 15

6.2.1水泥的扬尘控制 ························································································· 15 6.2.2浆液外溢控制 ···························································································· 15

第七章 基坑应急预案 ···································································································· 16

7.1应急预案领导机构 ······························································································· 16

7.1.1应急预案领导小组 ······················································································ 16 7.1.2领导小组人员职责 ······················································································ 16 7.1.3装备及通讯联系方式 ··················································································· 16 7.1.4资源配置 ·································································································· 17 7.2基坑喷砼面崩裂措施 ···························································································· 17

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北京地铁15号线一期工程07标段

俸伯站及站东明挖区间地层空洞注浆加固施工方案 第一章 编制依据和原则

1.1编制依据

⑴《北京地铁15号线俸伯站及站东明挖区间地质雷达空洞探测报告》工程编号：2010探测001 2010.03.12。

⑵《北京地铁15号线俸伯站及站东明挖区间地质雷达检测报告》工程编号：2010探测001-1 2010.03.26。

⑶《地铁15#线07标段地下空洞不密实区高密度电阻法探测工作报告》2010.03 ⑷ 2010年3月18日07标段降水方案技术咨询会专家意见。

1.2编制原则

在深刻理解工程特点、重点与难点的基础上，按照“技术领先、资源可靠、施工科学、组织合理、措施得力”的指导思想，遵循下列原则编制本方案。 1.2.1应急抢险原则

以基坑及周边交通环境安全为重点，结合本工程特点与实际情况，制定切实可行、有效的技术措施，建立完整的应急救援体系和控制程序，施工过程严格管理与控制，确保周边环境及基坑施工安全。 1.2.2工期保障原则

科学组织施工，合理配置资源，使各项分部工程施工衔接有序，充分利用本项目的资源，以确保总体施工计划的实现，确保总工期。 1.2.3技术可靠性原则

根据本工程特点，利用本单位既有工程施工技术、管理方法等成熟经验，编制可靠性高、可操作性强的施工技术方案进行施工，确保工程安全、优质、按期地完成。 1.2.4经济合理性原则

针对工程的实际情况，本着可靠、经济、合理的原则制定施工方案，并合理配备资源，施工过程实施动态管理，使工程施工达到既经济又优质的目标。 1.2.5环保原则

充分调查了解工程周边环境情况，施工紧密结合环境保护进行。合理布置施工场地，加强施工过程环境控制，减少空气、噪音污染，杜绝排放污水、丢弃垃圾等对环境的污染，维护交通运输。积极响应北京市的号召，建设“绿色工地”，实施“环保施工”。 1.2.6人文施工的原则

以人为本，维护和保障施工人员的安全与健康，建造和谐工地。

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北京地铁15号线一期工程07标段

俸伯站及站东明挖区间地层空洞注浆加固施工方案 第二章 工程简况

2.1工程概况

俸伯站及站东明挖区间位于潮白河东岸、顺平辅线下，潮白陵园南侧，车站总长258.2m，西段设右线盾构井，总长55.613m；站东明挖区间位于车站东端，沿顺平辅线布置，总长度约590m。

2.2设计概况

围护结构除俸伯站盾构井加深段为φ1000@1400钻孔桩+φ800、t=14mm的钢支撑外，其余为φ800@1200钻孔桩+φ800、t=14mm（站东明挖区间第一道支撑为φ609、t=14mm）的钢支撑，钻孔桩嵌入基底深度约6.7m；采用基坑外管井降水+基坑内疏干井降水的方法疏干开挖范围内土层的地下水。

2.3目前施工情况

俸伯站西端110m范围开挖见底，现已进入主体结构施工阶段，其中左线盾构井、渡线区间及右线盾构井处底板混凝土已浇筑完毕，军便梁以东68m范围实施放坡开挖；站东明挖区间东段基坑土方开挖范围长约139m，其中东端40m范围开挖至地面下15m。

2.4基坑周边地层情况

在对已开挖的基坑周边地层经两次地质雷达空洞探测及一次高密度电阻法探测后显示地下有19处明显异常，其中土质疏松10处，严重疏松5处，疑似空洞4处，共19处。详见表2.01异常点综合统计表，平面位置见图2-01所示。

图2-01 异常点平面位置图

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CHINA RAILWAY TUNNEL GROUP CO.,LTD.

北京地铁15号线一期工程07标段

俸伯站及站东明挖区间地层空洞注浆加固施工方案 表2.01探测异常点综合统计表

探测区域 异常编号 1#异常 2#异常 3#异常 4#异常 5#异常 6#异常 7#异常 A# B# C# D# E# 俸伯站及站东明挖区间已开挖基坑 周边5m范围 F# 异常区域位置 站前盾构井基坑北侧，里程约右线K44+699 左线盾构井基坑北侧，里程约右线K44+753 车站基坑北侧，里程约右线 K44+779 车站基坑北侧，里程约右线 K44+864 站东明挖区间基坑北侧，里程约右线K44+980 站东明挖区间基坑南侧，里程约右线K44+979 左线盾构井基坑西侧，里程约右线K44+743 车站基坑北侧，里程约右线 K44+753 车站基坑北侧，里程约右线 K44+790 车站基坑北侧，里程约右线 K44+743 车站基坑北侧，里程约右线 K44+882 盾构井南侧，里程约右线 K44+697 盾构井南侧，里程约右线 K44+743 异常范围 东西约5m，南北约1.2m，面2积约6m 东西约5m，南北约1.2m，面2积约6m 东西约7m，南北约2m，面积2约14m 东西约8.5m，南北约1m，面2积约8.5m 东西约6m，南北约1.5m，面2积约9m 东西约20m，南北约6m，面2积约120m 东西约5m，南北约1.7m，面2积约8.5m 东西约8.9m，南北约2.2m，2面积约19.6m 东西约8.9m，南北约2.2m，2面积约19.6m 东西约10m，南北约2.2m，2面积约22m 东西约13.7m，南北约2.2m，2面积约43.9m 东西约16.7m，南北约3.2m，2面积约53.5m 东西约8.5m，南北约3.2m，面积约27.2m 2深度 3.5～10.0m 3.5～9.5m 2.2～9.0m 1.7～8.6m 2.8～9.5m 2.2～9.0m 2.0～8.0m 11m 10m 12m 11m 10m 8m 异常性质 土层疏松 土层疏松 土层疏松 土层严重疏松 土层严重疏松 土层疑似空洞 土层疏松 土层疏松 土层疏松 土层疏松 土层疏松 土层疏松 土层疏松 G# 车站基坑南侧，里程约右线 东西约4.2m，南北约2.2m，2K44+779 面积约9.5m 车站基坑南侧，里程约右线 东西约11.2m，南北约2.2m，2K44+720 面积约24.7m 车站基坑南侧，里程约右线 东西约20m，南北约2.2m，2K44+864 面积约44m 东明挖区间基坑北侧，里程约左线K45+430 东明挖区间基坑北侧，里程约左线K45+571 东明挖区间基坑南侧，里程约左线K45+425 东明挖区间基坑南侧，里程约左线K45+529 东明挖区间基坑南侧，里程约左线K45+578 东西约10m，南北约3m，面积约30m 东西约12m，南北约3m，面积约36m 东西约5m，南北约3m，面积约15m 东西约8m，南北约3m，面积约48m 东西约5m，南北约3m，面积约15m 222229m 土层疏松 H# 9m 土层疏松 I# 9m 土层疏松 范围较小、一般异常 范围较小、一般异常 范围较小、轻微异常 范围较大、重点异常 范围较小、轻微异常 A’ # 3m～9m B’ # 3m～10m C’ # 6m～11m D’ # 2.5m～8m 7.5m～12m E’ #

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