北京某深基坑桩锚支护数值模拟分析

发布时间：2018-06-19 06:14

  本文选题：锚杆 + 桩　； 参考：《石家庄经济学院》2015年硕士论文

【摘要】：桩锚支护体系是基坑支护结构中最常用的一种,单纯的分析结构本身的受力、变形是比较容易的,关键在于土体是复杂的三项体,没有完全一致的力学特性,且桩锚体系中,锚杆的拉力来自于土体,土体受到的影响较为复杂;现行规范中桩体受到的土压力一般都是按照比较理想的水土合算或水土分算进行计算,其结果常与实际情况有出入。本论文大致分为两部分:第一部分,纯理论部分,主要简述了锚杆与岩、土体的相互作用、桩土相互作用以及桩锚协调作用。第二部分主要是在以北京某研发中心深基坑桩锚支护作为分析案例的背景下,在考虑渗流与不考虑渗流的情况下,计算了桩体两侧土压力的区别以及桩体变形。再用理正深基坑7.0软件以及Plaxis有限元软件对基坑土压力以及桩体变形进行了模拟、计算。将各计算结果对比基坑监测数据,分析了其各种方法的差异性。就此基坑工程而言,Plaxis软件模拟的桩体位移结果较理正深基坑7.0软件更接近监测数据;桩体两侧的土压力值在考虑渗流的水土分算的情况下更符合实际情况;土压力计算的弹性法(m法即弹性支点法)较经典法更合乎逻辑也更符合实际。
[Abstract]:The pile-anchor support system is the most commonly used one in the foundation pit supporting structure. It is easy to analyze the force of the structure itself and the deformation is relatively easy. The key is that the soil is a complex three-item body, without completely consistent mechanical properties, and in the pile-anchor system, The tensile force of anchor rod comes from soil and the influence of soil is more complex. The soil pressure of pile is calculated according to the ideal soil and water cost or soil and water distribution, and the results are often different from the actual situation. This paper is divided into two parts: the first part, pure theory part, mainly describes the interaction between anchor rod and rock, soil, pile-soil interaction and pile-anchor coordination. In the second part, the difference of soil pressure on both sides of pile body and the deformation of pile body are calculated under the background of pile anchor support of deep foundation pit of a research and development center in Beijing as an analysis case, considering seepage and not considering seepage. The earth pressure and pile deformation of the foundation pit are simulated and calculated by the software of Lizheng 7.0 and Plaxis finite element software. The results of calculation are compared with the monitoring data of foundation pit, and the differences of various methods are analyzed. The displacement result of pile simulated by Plaxis software is closer to the monitoring data than that of the plumb foundation pit 7.0 software, and the soil pressure on both sides of the pile is more in line with the actual situation when considering the soil and water distribution of seepage. The elastic method (elastic fulcrum method) is more logical and practical than the classical method.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU476

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