广州猎德大厦深基坑支护设计及变形规律研究
发布时间：2018-07-23 08:10
【摘要】：随着城市现代化的快速发展,越来越多的大型工程设施兴建,大量的深基坑工程随之出现。深基坑工程的开挖与支护作为基坑工程施工的重点及最为复杂的土木工程技术领域之一,同时也是目前研究的热点和难点。本文以广州猎德大厦深基坑工程为研究背景,选择最优的支护结构类型进行支护结构计算,采用FLAC3D软件进行基坑开挖支护模拟,并对基坑开挖支护过程进行了现场监测。本文主要研究工作及结论如下:(1)猎德大厦深基坑为一级基坑,开挖面积较大,周边环境复杂,对沉降以及变形的要求相对较高,综合比较各种支护方案的优缺点,最终选定基坑主体选用排桩+锚索支护,采用双排搅拌桩作为止水帷幕。选取基坑西北角BC1区段和西侧A4A2区段进行支护设计计算,通过计算各开挖阶段的土压力分布和最大弯矩分布,确定排桩的参数和锚索参数,经过计算选用直径为1200mm、桩间距为1400mm、桩长26m的钻孔灌注桩,四道锚索,经过基坑稳定性验算,满足稳定性要求。(2)采用FLAC3D软件进行基坑开挖支护模拟,计算结果表明随着开挖深度加大,基坑周围土体的最大垂直位移发生在靠近基坑壁处,离基坑壁越近,土体水平位移越大,在基坑最上部坑壁处水平位移最大,产生大约20mm的变形,基坑周围土体整体向基坑内侧移动,基坑变形值小于安全预警值,支护结构安全合理。(3)在整个基坑开挖和支护施工过程中,对基坑进行了现场监测。桩顶最大水平位移约14.8mm,基坑顶面最大沉降约7.21mm。可以看出基坑的变形在该支护设计方案下得到了很好的控制,达到安全目的。(4)围护结构的侧向水平位移监测数据和数值模拟计算结果相比,数值模拟计算数据大于最终实际监测数据,但总体变化趋势一致,数值模拟计算结果相对保守,进一步说明了排桩+锚索支护方案的安全合理性。
[Abstract]:With the rapid development of urban modernization, more and more large engineering facilities are built, and a large number of deep foundation pit projects appear. The excavation and support of deep foundation pit engineering is one of the most complex technical fields of civil engineering as well as the focal point of foundation pit construction. At the same time, it is also the hot and difficult point of current research. In this paper, based on the research background of the deep foundation pit engineering of Guangzhou Gede Tower, the optimal type of supporting structure is selected to calculate the supporting structure, and the FLAC3D software is used to simulate the excavation of foundation pit, and the process of excavation and support of foundation pit is monitored on the spot. The main research work and conclusions of this paper are as follows: (1) the deep foundation pit of Gede Tower is a first class foundation pit. The excavation area is large, the surrounding environment is complex, the requirements for settlement and deformation are relatively high, and the advantages and disadvantages of various supporting schemes are comprehensively compared. Finally, the main body of foundation pit is supported by row pile and anchor cable, and double row mixing pile is used as waterproof curtain. BC1 section of the northwest corner of foundation pit and A4A2 section on the west side of the foundation pit are selected for supporting design and calculation. By calculating the distribution of earth pressure and maximum bending moment in each excavation stage, the parameters of pile row and anchor cable are determined. The bored cast-in-place pile with diameter 1200mm, pile spacing 1400mm, pile length 26m and four Anchorage cables are selected. The stability of foundation pit is checked and calculated. (2) FLAC3D software is used to simulate the excavation of foundation pit. The results show that with the increase of excavation depth, the maximum vertical displacement of soil around the foundation pit occurs near the wall of the foundation pit, the closer the soil is to the wall of the foundation pit, the greater the horizontal displacement of the soil is, and the maximum horizontal displacement occurs at the top of the pit wall. The deformation of the foundation pit is about 20mm, the soil around the foundation pit moves to the inside of the foundation pit, the deformation value of the foundation pit is less than the value of safety warning, and the supporting structure is safe and reasonable. (3) during the whole excavation and construction of the foundation pit, the field monitoring of the foundation pit is carried out. The maximum horizontal displacement of the pile top is about 14.8 mm and the maximum settlement of the top surface of the foundation pit is about 7.21mm. It can be seen that the deformation of foundation pit is well controlled under the support design scheme, and the purpose of safety is achieved. (4) the lateral horizontal displacement monitoring data of the retaining structure are compared with the numerical simulation results. The numerical simulation data is larger than the final actual monitoring data, but the overall change trend is the same, and the numerical simulation results are relatively conservative, which further shows the safety and rationality of the support scheme of the row pile anchor cable.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753;TU433
[Abstract]:With the rapid development of urban modernization, more and more large engineering facilities are built, and a large number of deep foundation pit projects appear. The excavation and support of deep foundation pit engineering is one of the most complex technical fields of civil engineering as well as the focal point of foundation pit construction. At the same time, it is also the hot and difficult point of current research. In this paper, based on the research background of the deep foundation pit engineering of Guangzhou Gede Tower, the optimal type of supporting structure is selected to calculate the supporting structure, and the FLAC3D software is used to simulate the excavation of foundation pit, and the process of excavation and support of foundation pit is monitored on the spot. The main research work and conclusions of this paper are as follows: (1) the deep foundation pit of Gede Tower is a first class foundation pit. The excavation area is large, the surrounding environment is complex, the requirements for settlement and deformation are relatively high, and the advantages and disadvantages of various supporting schemes are comprehensively compared. Finally, the main body of foundation pit is supported by row pile and anchor cable, and double row mixing pile is used as waterproof curtain. BC1 section of the northwest corner of foundation pit and A4A2 section on the west side of the foundation pit are selected for supporting design and calculation. By calculating the distribution of earth pressure and maximum bending moment in each excavation stage, the parameters of pile row and anchor cable are determined. The bored cast-in-place pile with diameter 1200mm, pile spacing 1400mm, pile length 26m and four Anchorage cables are selected. The stability of foundation pit is checked and calculated. (2) FLAC3D software is used to simulate the excavation of foundation pit. The results show that with the increase of excavation depth, the maximum vertical displacement of soil around the foundation pit occurs near the wall of the foundation pit, the closer the soil is to the wall of the foundation pit, the greater the horizontal displacement of the soil is, and the maximum horizontal displacement occurs at the top of the pit wall. The deformation of the foundation pit is about 20mm, the soil around the foundation pit moves to the inside of the foundation pit, the deformation value of the foundation pit is less than the value of safety warning, and the supporting structure is safe and reasonable. (3) during the whole excavation and construction of the foundation pit, the field monitoring of the foundation pit is carried out. The maximum horizontal displacement of the pile top is about 14.8 mm and the maximum settlement of the top surface of the foundation pit is about 7.21mm. It can be seen that the deformation of foundation pit is well controlled under the support design scheme, and the purpose of safety is achieved. (4) the lateral horizontal displacement monitoring data of the retaining structure are compared with the numerical simulation results. The numerical simulation data is larger than the final actual monitoring data, but the overall change trend is the same, and the numerical simulation results are relatively conservative, which further shows the safety and rationality of the support scheme of the row pile anchor cable.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753;TU433
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