基坑支护中SMW工法细部优化设计研究

发布时间：2018-07-06 16:56

本文选题：SMW工法 + 支护设计　；参考：《苏州科技学院》2015年硕士论文

【摘要】：近些年,随着深度深、面积大的基坑形式不断涌现,SMW工法在我国得到较多的应用。但目前SMW工法理论仍不够完善,为了解决以上问题,就需要对SMW工法基坑支护理论进行更深入研究并对其工艺进行优化。首先,本文通过对SMW工法相关技术环节的理论分析和实际工程进行有限元分析手段进行了以下研究:(1)将型钢水泥土搅拌墙中的型钢按刚度等效的原理等效成为连续墙进而比较两种不同支挡结构下的基坑水平位移,分析水泥土对型钢水泥土搅拌墙组合刚度的贡献;(2)分析在混凝土与钢支撑混合支撑体系下支撑预加力及刚度对基坑变形及内力的影响;(3)通过以支护挡墙最大弯矩为目标函数采用分段等值梁法结合遗传算法对支撑位置进行优化布置;(4)模拟分析型钢回收起拔力主要影响因素。通过上述分析研究得到以下主要成果:1、得出了SMW工法中水泥土对型钢水泥土桩刚度的贡献大小。2、分析了在混凝土与钢混合支撑体系下支撑预加力及刚度对基坑变形及内力的影响,并给出其在设计中的合理取值。3、以支护挡墙最大弯矩为目标函数,采用分段等值梁法结合遗传算法对SMW工法中支撑位置进行优化布置。4、通过分析明确了基坑支护结构变形较小时,型钢起拔力主要由型钢与水泥土之间的静摩阻力控制,变形阻力可忽略,同时本文也给出了型钢起拔力计算的建议公式。
[Abstract]:In recent years, with the deep depth and large area of foundation pit, SMW method has been widely used in China. However, the theory of SMW method is still not perfect at present. In order to solve the above problems, it is necessary to further study the theory of foundation pit support of SMW method and optimize its technology. First In this paper, the theoretical analysis of relevant technical links of SMW engineering method and the finite element analysis of practical engineering are carried out as follows: (1) the section steel in the SMW cement-soil mixing wall is equivalent to the continuous wall according to the principle of stiffness equivalence. And comparing the horizontal displacement of foundation pit with two different retaining structures, The contribution of cement soil to composite stiffness of steel cement soil mixing wall is analyzed; (2) the influence of bracing prestress and stiffness on the deformation and internal force of foundation pit under the mixed bracing system of concrete and steel bracing is analyzed; (3) the maximum bending moment of retaining wall is obtained by means of supporting retaining wall. For the objective function, the piecewise equivalent beam method combined with genetic algorithm is used to optimize the layout of the support position. (4) the main factors affecting the drawing force of the section steel recovery are simulated and analyzed. Through the above analysis and research, the following main achievements are obtained: 1, and the contribution of cement soil in SMW method to the stiffness of steel cement soil pile is obtained. The prestressing force of bracing and stiffness to foundation pit deformation under concrete and steel mixed bracing system are analyzed. The influence of shape and internal force, The reasonable value. 3 is given in the design. The maximum bending moment of retaining wall is taken as the objective function. By using the piecewise equivalent beam method and genetic algorithm, the support position in SMW method is optimized. Through the analysis, it is clear that the deformation of foundation pit support structure is small, and the drawing force of section steel is mainly controlled by static friction resistance between section steel and cement soil. The deformation resistance can be neglected, and the suggested formula for calculating the drawing force of section steel is also given in this paper.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU753

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