文档介绍：本科生毕业论文(设计)
题目:广场A-IJ段基坑支护设计
姓名: 康正波学号: 200903334
院(系): 土木工程学院专业: 工程力学
指导教师: 职称:
评阅人: 职称:
二0一三年六月
摘要
随着城市化过程中不断涌现的中高层和超高层建筑,以及对地下空间的开发,就产生了大量的深基坑。在基坑开挖过程中必然会涉及到基坑的支护,而基坑支护不仅会影响工程的进度,也会影响到工程安全,本论文主要对武汉万达广场A-IJ段基坑支护结构进行设计及稳定性验算。
广场基坑分为A、B基坑两块,呈“吕”字型分布,总占地面积约57000m2,基坑开挖深度都在10m左右,属于深基坑,A-IJ段基坑处地层主要有杂填土,粘土,淤泥质粉质粘土,粉土夹粉砂,粉砂,粉细砂,地下水类型主要为上层滞水和第四系空隙承压水,基坑支护主要采用钻孔灌注工艺的支护桩进行支护,同时在基坑上部减载放坡,坑壁设置粉喷桩止水帷幕。
在进行支护桩设计计算时,土压力计算采用郎肯土压力理论,水土合算,,支护桩的长度和入土深度采用极限土压力平衡理论和等值梁法计算确定,,求取支护桩的最大弯矩后可以按《混凝土结构设计规范》(GB50010-2002)中有关公式求支护桩的配筋,此段基坑支护桩配筋为32Φ28,在通过配筋验算后还要对此段基坑的稳定性进行验算,采用里正软件分析基坑的整体稳定性,基坑底的隆起和基坑的管涌及冲溃,通过验算可知A-IJ段基坑支护设计满足基坑的稳定性要求。
关键词: 深基坑深基坑维护支护设计稳定性
ABSTRACT
With the urbanization process ,high-rise buildings and supertall buildings are continuously emerging, and underground space development project e more and more. As a result, it generated a lot of deep excavation projects. In the process of excavation ,it inevitably involves the support of excavation pit. And the excavation will not only affect the progress of the project ,it will also affect engineering safety. This paper mainly studys the design of supporting structure and putations of the A-IJ section in Wanda Plaza pit, Wuhan.
Wanda Plaza Foundation pit is divided into A, B sections. On the plane, its distribution likes the figure of "吕" type. The total area of Wanda Plaza Foundation pit is about 57000m 2, excavation depth is about 10m, belonging to deep foundation pit. The A-IJ Section of Foundation pit is mainly fill with clay, silty clay, silty soil clip silty sand, silt and fine sand; groundwater types are mainly perched water and Quaternary confined pore water; pit support mainly take bored piles supporting technology, load shedding on the upper foundation, pit wall set DJM waterproof curtain.
During the design calculations of supporting piles, earth pressure calculated using the theory of King, soil and water cost-effective and passive earth pressure reduction factor of