毕设基本摘要
摘 要
拟建工程主体结构：建筑物下设有一层地下室，地下室垫层底标高为-5.8m，局部机械停车车库垫层底标高为-7.2m。拟采用预应力管桩基础。基坑面积约8004.38m2，基坑周长约为470.71m。本基坑工程以自然地面为假定±0.00，所注标高皆相对于此标高，自然地面标高为+6.2m。
结合本工程地质、环境、挖深等诸多因素确定安全可靠的支护方案；为基坑土方开挖和地下室施工创造一个安全干燥的施工环境；考虑到邻近坑边有建筑和道路（下设有水、电、气等管线），为确保安全，以“变形”控制设计。
本着“安全可靠、经济合理、技术可行、施工方便”原则， LMNO、WXYZA1A段采用SMW支护桩加一层钢筋砼支撑作为支护结构；其余段采用三轴深层搅拌桩加自钻式土钉复合土钉墙作为支护结构；深浅坑分界处采用自然放坡处理，坡比1:1； 基坑外侧采用管井降低止水帷幕外侧水头，坑内采用管井降低地下水位。
设计之前先对复合土钉支护以及SMW工法两种较新的支护形式做了介绍，后分别对两种支护形式进行了具体手算和电算，列出了施工要求和监测方案，并绘制了平面图、剖面图、大样图。由于目前还没有一种电算软件考虑了复合土钉中搅拌桩的作用，本设计中采用了另一种计算模式分析了整体稳定性。
关键词：基坑开挖 SMW工法 复合土钉 钢筋混凝土支撑 三轴深层搅拌桩
Abstract
The proposed building includs a basement . the bottom elevation of the basement cushion is -5.8 meters,for some partial mechanical parking garage, the bottom elevation is -7.2 meters. Pre-stressed pipe pile foundations are to be adopted.The area of the foundation pit is approximately 8004.38 square meters, the perimeter of which 470.71 meters. This foundation pit project takes the natural ground as the hypothesis ±0.00, which is relatively Note elevation of this elevation.The average level of the natural ground is +6.2 meters.
Considering of the geologic environment, excavation depth of the foundation pit, to create an safe and dry surroundings for the earth work and basement, we carry out the design in control of displacement deformation, in order to keep the main traffic roads and buildings safe and to arrange pipelines of water, electricity and coal gas below the surface.
According with fundamental technical standard, approaching safe reliability, the economical-reasonable and convenient construction and guaranteeing project time limit，we use SMW guard stakes as retaining structure, reinforced concrete bracing as bracing structure for LMNO,WXYZA1A section and use triaxial deep mixing piles combined with composite soil nail wall as a support structure for other sections. slope treatment is used in the deep pit boundaries. The gradient is 1:1.With the purpose of dewatering, we use tube wells.
Before the design, Ii first makes some introduction about the two new forms of shoring which are SMW method and Composite soil nailing then carrys on with the two shoring forms in detail respectively by hand and by computer。It also carrys out the request of construction and the project of survey and draws ichnography, sectional drawing, the detail drawing.Since there is no software can consider the function of the mixing pile in the Composite soil nailing,it uese another design mode to analysis the overall stability.
Key words: foundation pit excavation; SMW method; Composite soil nailing;
Reinforced concrete bracing; Triaxial deep mixing pile
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