地铁车站项目策划书

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序号施工重难点应对措施本车站结构公共区为地下二层、公共区两端头为地下三层双柱三跨结构，基坑深度21.41m砂层，使车站施工风险增大。车站主体施工基坑开挖过程中的安全是本工程重点。①车站围护采用地下连续墙

四道支撑及一道换撑

护结构体系，以减少基坑变形；②施工前编制地连

墙施工方案，并报监理工程师审批；施工中严格执行地下连续墙方案，严格控制施工质量；③基坑开挖与支撑工序紧密衔接，做好基坑支撑轴力复加，遵循时空效应原理；控制好基坑安全风险；④做好降水和围护渗漏封堵，降低坑外地层损失；⑤做好变形监测，特别是差异沉降，必要时加密监测频率，及时指导信息化施工。XXXX

盾构始发提供条件。科学组织施工是确保

台盾构如期始发的重点

①按时开工并

加大机械、人员投入

尽快完成围护结构施工；②将盾构始发长度范围基坑开挖作为施工组织重点，在

16T

25T

全施工的基础上加快开挖进度；保证车站两端头盾构始发长度，重点突出确保始发节点；③在兼顾整体施工的资源配置及施工方案优化基础上，着重加强各工序之间的衔接，实现各工序流水作业。场区地质条件复杂，围护结主要地层为素填土、黏土层、砂层，使地连

墙施工过程中容易失稳塌孔，

护结构在散体状强风化闪长层范围内的施工是难点，地连墙施工的难度大是本工程的难点。

1000mm

800@600

免地下连续墙墙淤泥，砂层施工

中槽壁失稳

塌孔；②施工前编制地连

墙施工方案，并报监理工程师审批；施工中严格执行地下连续墙方案，严格控制施工质量；③施工过程紧密衔接各个施工工序，

缩短槽壁暴露

间；④优化施工机械配置，加快施工进度，减少

幅段工时间。

序号风险评估对象风险描述风险等级车站主体结构基坑车站公共区为地下二层单柱双跨拱形结构，公共

12m

278.6m

20.9m3m

21.41m

1m

的地下连续墙，采用内支撑体系，竖向共设置4+1

钢管支撑，基坑安全性等级为一级。Ⅱ级附属结构基坑本站附属工程包含

号风亭风道和

出入口，及

个消防出入口

。附属结构除

1017m

右，穿越地层为素填土、填砂、粉质粘土。单层附属结构基坑均采用围护桩

内支撑体系，

亭采用地连墙内支撑体系。Ⅲ级

风险实施前风险实施过程中实施完成后 风险实施前风险实施过程中实施完成后风险辨识、评估技术准备：交底、环境调查、设计分析、分级调整、方案编审等建立风险清单台账安全监控平台 管理措施：培训教育、安全技术交底、应急物质储备等条件验收否是过程实施预防措施监测及巡视监测数据信息汇总，信息上报安全风险评估是

否风险预警预警响应及处理风险消除总结、评价考核、兑现

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