唐山三友集团热电厂厂房基坑支护工程设计

发布时间：2018-04-20 23:40

本文选题：基坑支护桩锚支护土钉和桩锚结合支护 + SMW　；参考：《长春工业大学》2017年硕士论文

【摘要】：《唐山三友集团热电厂厂房基坑支护工程设计》来源于唐山三友集团热电厂厂房基坑支护实际工程。本拟建工程位于唐山市南堡经济技术开发区的厂区南侧,基坑开挖深度为15.1m,基坑形状为矩形,周长为495m,开挖底面积近3110.9m2。根据工程实际情况和国内外支护现状,初步拟定了三种基坑支护方案:土钉和桩锚结合支护(上:土钉墙、下:桩锚)、SMW工法支护结构和桩锚支护;分别对这三种方案进行了初步设计及参数优化,并分别进行了工程预算;通过分析、对比与论证这拟定的三种支护方案,从技术的可行性、工程的可靠性以及经济的合理性这三个方面进行综合考虑,最终选定了一个最佳的基坑支护方案:桩锚支护。接着对这个优选方案进行了优化设计,其优化设计的参数为:钻孔灌注桩桩长22.85m,入土深度为8.5m;布置倾斜角度均为a(28)22°的三层锚杆,三层锚杆长度依次为25m,23m,21m,其中第一层锚杆非锚固段长为13m,锚固段为12m;第二层锚杆非锚固段长为10m,锚固段长为13m;第三层锚杆非锚固段长为7m,锚固段长为14m;三层锚杆的垂直间距自地面从上而下依次为3.1m,5.5m,1.0m;水平间距均为2m。同时还对优化设计后的方案进行施工组织与施工技术方案设计,以及工程质量监测的方案设计。本设计的创新点在于:第一,通过费伦纽斯经验方法来确定土钉墙支护最危险滑裂面,因为如果是采用普遍条分法是解决不了任何问题的,必须采用合适的方式,即费伦纽斯经验方法,这样才能够比较快速的将非常危险的圆弧滑裂面进行确定;第二,通过分层计算的方式方法来进行桩锚支护设计,即通过采用分层计算方法,这样不仅仅能够将桩锚支护方案很好地完成,同时在计算的时候也相应增加了其稳定性,有助于满足其各方的需求并进行下一层的设计计算;第三,对初选的方案参数进行相关的优化,具体是在优化设计的时候,对支护结构中灌注桩的入土深度和桩长不做修改设计,主要对桩体抗弯性过大,锚杆的稳定性系数过大等进行优化设计。经过方案论证,确立了通过桩锚支护作为相关的方案,对这一方案同时需要进行相关的优化设计。在经过方案的优化设计之后,在保证工程安全可靠的情况下,相对来说减少了成本,提高了整体的经济效益。优化设计后工程总造价为6233514万元。
[Abstract]:The foundation pit support engineering design of the workshop of Sanyou group thermal power plant of Tangshan Sanyou group comes from the actual engineering of foundation pit support of the workshop of Sanyou group thermal power plant in Tangshan city. The proposed project is located at the south side of Nanbao Economic and technological Development Zone in Tangshan City. The excavation depth of foundation pit is 15.1 m, the shape of foundation pit is rectangular, the circumference is 495m, and the excavation bottom area is nearly 3110.9m2. According to the actual situation of the project and the current situation of support at home and abroad, three kinds of supporting schemes of foundation pit are preliminarily drawn up: soil nailing and pile-anchor combined support (first: soil nailing wall, under: pile anchor / SMW support structure and pile-anchor support; The preliminary design and parameter optimization of the three schemes are carried out respectively, and the project budget is carried out separately. Through analysis, comparison and demonstration of the three support schemes, the feasibility of the three support schemes is discussed. Considering the reliability and economic reasonableness of the project, a best supporting scheme of foundation pit, pile anchor support, was finally selected. Then, the optimum design of the optimum selection scheme is carried out. The parameters of the optimum design are as follows: the bored pile length is 22.85 m, the depth of the pile is 8.5 m, and the three-layer anchor rod with a tilt angle of a 2822 掳is arranged. The length of the third layer is 25m ~ 23m ~ 21m, of which the first layer is 13m, the first layer is 12m, the second layer is 10m and the length is 13m; the third layer is 7m and 14m; the first layer is 13m; the second layer is 10m; the second layer is 10m; the third layer is 7m; the length of the third layer is 14m; and the length of the third layer of anchor is 14m; the length of the second layer is 10m; the length of the third layer is 13m; and the length of the third layer is 14m. The vertical distance from the ground to the bottom is 3.1mg ~ 5.5 m ~ (-1) m, and the horizontal spacing is 2 m ~ (-1). At the same time, the construction organization, the construction technology and the project design of the project quality monitoring are carried out after the optimization design. The innovation of this design lies in: first, to determine the most dangerous sliding surface of soil nailing wall support by Fellenius empirical method, because if the universal strip method is not able to solve any problem, it must be adopted in a suitable way. That is, Fellenius empirical method, so that the very dangerous arc slip surface can be quickly determined; second, through the layered calculation method to carry out the pile anchor support design, that is, through the use of layered calculation method, In this way, not only can the pile-anchor support scheme be completed very well, but also the stability of the pile-anchor support scheme can be increased in the calculation, which will help to meet the needs of all the parties and carry out the design calculation of the next layer. Third, The related optimization of the primary project parameters is that the depth and length of the cast-in-place pile in the supporting structure are not modified when the optimum design is carried out, and the bending resistance of the pile body is too great. The stability coefficient of anchor rod is too large to optimize the design. Through the demonstration of the scheme, the pile-anchor support is established as the relevant scheme, and the optimization design of the scheme is also needed. After the optimal design of the project, the cost is reduced and the overall economic benefit is improved under the condition of ensuring the safety and reliability of the project. The total cost of the project after optimization design is 62.33514 billion yuan.
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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