长春市正阳小学消防水池工程基坑支护及降水设计

发布时间：2018-01-06 22:03

本文关键词：长春市正阳小学消防水池工程基坑支护及降水设计　出处：《吉林大学》2014年硕士论文　论文类型：学位论文

【摘要】：基岩土工程技术界的一个热点、难点问题是基坑工程，其具有很强的综合性、复杂性，对个科学领域都有所涉及，更影响工程安全和成本因素。因此，选取这一课题来进行钻研探究具有一定的现实意义。基坑开挖时，基坑降水和支护是最重要的两个部分。尤其在地下水位较高的土层，基坑开挖前，必须进行基坑降水，为接下来施工创造一个安全干燥的环境。本文就长春市正阳小学新建消防水池这一工程实例，对基坑支护和降水分别进行了探讨。该项目位于长春市绿园区，根据其工程概况和地质条件，对基坑施工方案作了初步设计。经过对比分析多种基坑支护方式、降水方法以及它们的适用条件后，经综合考虑，最终确定本基坑的支护方法为土钉墙支护；降水方法采用管井井点降水。为设计单位提供了可靠的理论和试验数据，对具体施工方案都作出了相应的环保及防治措施，并制定了应急预案，用来保证施工的顺利进行。土钉支护深度6.0m断面，土钉自上而下长度分别为6m，6m，6m，5m；行距1.3m，列距1.5m，，角度15度，直径130mm，土钉钢筋直径18mm，土钉面层80mm。对基坑支护系统的设计计算可知，整体稳定安全系数、土钉抗拔力安全系数，抗滑稳定安全系数、抗倾覆稳定安全系数均满足安全要求。管井井点降水是目前比较先进、可靠的降水技术。当施工环境的地下水位较高时，可以选取这一降水方式，它是地基与基础工程施工及土方开挖过程中常用到的一种降水技术手段，可有效降低地下水位，减少基坑土体含水率，改善土壤的物理和机械性能，提高土体的承载力与地基强度，降低土壤的侧向位移与沉降。本工程为潜水完整井，沿开挖的基坑周围，离基坑边缘1.0m处，每隔8m设置一个管井，井埋置深度为13m，每个管井单独用一台潜水泵进行抽水，井点数为10个，降水水位深度为5.7m，在基坑内设排水沟和集水井，在基坑顶部混凝土护面外侧设置排水沟排水。本文所做的设计方案在实际工程中取得圆满成功。
[Abstract]:A hot rock soil engineering technology field, is the difficult problem in foundation pit engineering, it is comprehensive, very strong complexity, has involved in the scientific field, the more influence the safety and cost factors. Therefore, choosing this topic to study research has certain practical significance.
Foundation pit excavation, foundation pit dewatering and support is the most important two parts. Especially in the high water level soil layer, before foundation pit excavation, we must carry out foundation pit dewatering, so as to create a safe and dry environment for the next construction.
This paper Changchun Zhengyang city primary school new fire pool of this project, for the excavation and precipitation are discussed. The project is located in the district Changchun City, according to the engineering situation and geological conditions of foundation pit construction has made the preliminary design scheme. Through comparative analysis of various excavation, precipitation method and the applicable conditions of them, after comprehensive consideration, and ultimately determine the foundation pit supporting method for soil nailing wall; precipitation method using tube well point precipitation. Provide a theoretical and reliable test data for design units, have made environmental protection and prevention and control measures of concrete construction plan, and develop a contingency plan for to ensure the smooth progress of the construction.
Soil nailing depth 6.0m section, from top to bottom soil nailing length were 6m, 6m, 6m, 5m; 1.3m row space, column spacing 1.5m, 15 degree angle, diameter 130mm, diameter of 18mm reinforced soil, soil surface layer 80mm. design of foundation pit supporting system calculation shows that the overall stability coefficient, soil nail pullout force of safety the coefficient, the safety factor of stability against sliding, overturning stability safety factor meets the safety requirements.
Well well point precipitation is more advanced, reliable precipitation technology. When the underground water level is higher the construction environment, you can select the precipitation method, it is a kind of precipitation technique that is often used in the construction process of foundation engineering and earthwork excavation, can effectively reduce the ground water level, reduce the water content of foundation soil rate. The improvement of soil physical and mechanical properties, improve the bearing capacity and strength of foundation soil, reduce soil lateral displacement and settlement.
This project is a complete diving well, around the excavation of the pit, away from the edge of the pit at 1.0m, every 8m set up a well, well depth is 13m, each with a single well pumping of submersible pumps, wells points to 10, precipitation water depth is 5.7m, drainage ditch and sump pit in setting the drainage pit top concrete lateral drainage.
The design scheme made in this paper has been successfully completed in the actual project.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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