墙式与柱状复合地基承载性能数值模拟研究

发布时间：2018-01-07 21:36

本文关键词：墙式与柱状复合地基承载性能数值模拟研究　出处：《沈阳建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：在均布荷载作用下,均质地基的沉降曲线呈中间区域大、边缘区域逐渐减小的曲线型分布,理想条件下,地基中心处位置的沉降值约为最边缘处沉降值的2倍,本文据此试图通过调整不同长度桩体的搭配组合形式以及加设外墙的方式,改变地基的刚性分布以实现减小地基的总体沉降、控制地基的不均匀沉降的目标,实现调平设计论文主要从数值建模计算分析的角度,以长短桩的数量以及布置形式为变量,设计了5组建模方案以及1组无增强体配置情况下的砂土模型方案,通过计算结果的对比分析来研究墙式与柱状复合地基的沉降分布特性以及对于控制总体沉降和不均匀沉降的作用效果。在不同的墙式与柱状复合地基配置模型方案中,将桩体按中间桩体最长、边缘桩体最短,从中间到边缘桩体长度递减的梯形布置原则来调整地基的刚度分配最为合理。不同模型方案的计算结果表明,在土中设置桩体后,模型地基的总体沉降得到了有效控制,但不同的桩体配置组合对于控制基础的总体沉降和不均匀沉降的效果差异较大。在桩体总长度基本一致的情况下,适当加大基础中心区域桩体深度,对于控制基础不均匀沉降更有效。外墙体的设置也同样重要,加固区地基在墙体约束效应下的承载力得到较大的提升,控制基础总沉降和不均匀沉降的效果明显。根据模型计算结果绘制出相应的沉降曲线,可以看出加载过程中经处理过的地基沉降曲线较为平缓,没有出现明显的拐点,符合缓变性要求。合理布置墙式与柱状复合地基的长短桩搭配组合,可以有效的减小地基的总体沉降,调节地基的不均匀沉降,使地基在均布荷载作用下协调变形,通过这种基础形式合理调节地基刚度分配,实现调平设计的目标。
[Abstract]:Under uniform loads, the settlement curve showed homogeneous foundation middle region, the curve edge area gradually reduced distribution, under ideal conditions, the position of center of the foundation settlement value is about 2 times the edge sedimentation value, this paper tries to adjust the collocation form of piles with different lengths and adding the external walls of the way, change the distribution of rigid foundation to achieve the overall foundation settlement decreases, control the uneven settlement of ground target, realize leveling design paper from the numerical modeling calculation analysis, by the number of long and short piles and layout as the variable, designed 5 sets and 1 sets of non enhanced modeling scheme of sand model body configuration case, through the comparative analysis of calculation results to study the distribution of settlement characteristics of composite foundation wall and column and to control the total settlement and uneven settlement of the effect Fruit. In the scheme configuration model of wall and column composite foundation in pile pile in the middle is the longest, the shortest edge pile, the stiffness distribution principle of trapezoid arrangement from the middle to the edge of pile length decreasing to adjust the foundation of the most reasonable calculation model. The results show that different schemes. The pile body is arranged in the soil, the general model of ground settlement has been effectively controlled, but the combination of different pile configuration for the overall control of settlement and uneven settlement of the effect of differences. In the total length of pile under the condition of the same area, center pile depth is increased properly, for the control of uneven foundation the settlement is more effective. The outer wall is also important, strengthening the bearing capacity of foundation in the wall under the constraint effect is improved greatly, the control of total settlement and uneven settlement of the effect is obvious. According to the results of model calculations Draw the corresponding settlement curve, we can see that in the loading process of the foundation settlement curve is smooth, no obvious inflection point, with slow change requirements. Reasonable arrangement of long short pile wall and column composite foundation collocation, can effectively reduce the overall settlement of foundation, adjust the uneven settlement of foundation make the foundation under uniform load are coordinated deformation and adjust the stiffness distribution through the foundation forms the basis of the implementation of leveling design goals.

【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU470

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