地铁某车站工程施工降水研究

Research on Water Lowering During Construction of Subway Station

研究目的:地铁工程降水是地铁建设的重要组成部分,直接影响工程建设的安全实施,控制工程建设周期,在整个工程建设中作用重大,意义深远。研究结论:在强渗透性土中进行施工降水,通过对坑内、坑外降水优缺点进行综合分析比较,采用坑外降水方法:(1)能够满足涌水量较大基坑降水要求,保证车站结构底面以上无水作业;(2)有效地避免和减少对施工的干扰和影响,利于车站基坑开挖及结构施工的组织和实施;(3)利于降水和排水作业有序顺利进行;(4)经过后期该车站施工验证,基坑涌水量预测、单井出水量计算是较为准确的,对今后类似工程的降水作业有一定的借鉴和指导作用。

Research purposes： The water lowering during subway construction is an important part of the subway con- struction and is crucial to the construction safety, the control of the construction period and the whole construction process. Research conclusions：Through the analysis of the advantages and disadvantages of the water lowering in and out of the foundation pit in strong permeability soil, the water lowering out of the foundation pit has the following features ： （ 1 ） The requirement of water lowering can be met for the foundation pit with large water - bursting so that the works above the bottom surface can be done without water. （2） The interference and impact on the construction can be effectively avoided and cut so that it is good for the excavation of the foundation pit and organization and implement of the structure construction. （3） It is good for doing the works of the water lowering and drainage in order. （4） The station construction in later stage proves the prediction of the water - bursting volume of the foundation pit and calculation of the water yield of one well are accurate so that it can provide the reference to the similar works.