桩板结构与岩土体相互作用机理的研究及其优化设计

发布时间：2018-05-10 19:23

本文选题：桩板结构 + 嵌固形式　；参考：《重庆交通大学》2016年硕士论文

【摘要】：桩板结构是近些年来出现的一种新型常见的边坡加固结构,具有良好的防护加固效果,用途广泛,可用于特殊土地区,地震区和雨水多发区的高边坡和路堤、路堑。在滑坡治理中更是常见的应用手段。本文研究了桩板结构与岩土体之间的相互作用机理与分析桩板结构嵌固深度的优化设计。本文对桩板结构的研究主要有以下内容与结论:(1)桩板结构中桩身嵌固方式的研究。通过摩尔-库伦准则确定条间剪力,改进了传统的传递系数法。通过分析桩身在自由、铰支、固定三种状态下弯矩和位移的不同变化,并对比K法、M法的适用条件,从而找到桩身合理的嵌固条件与嵌固形式。(2)基于土拱效应理论,研究了桩板—岩土体相互作用的机理。分析了板位置不同时桩板结构的受力传递机制;根据“普氏卸载拱”理论,建立了桩板间岩土体的受力模型,通过数值分析,考虑静态与地震作用下岩土对桩板结构及土拱效应的影响。(3)根据土拱效应原理及板位的变化,对桩板结构构件的设计进行了比较分析。通过数值模拟挡板在桩身前后时桩板结构的内力变化分析,提出了合理化的建议。(4)通过FLAC 3D数值模拟分析了桩身嵌固深度对滑坡稳定性的影响,得出当桩身嵌固段长度为桩身总长度的1/2—1/3时最为合理,并采用等值梁法进行了验证。提出一种简单的、符合工程的桩身嵌固深度的方法。
[Abstract]:Pile-slab structure is a new type of common slope reinforcement structure in recent years. It has a good effect of protection and reinforcement. It can be used in high slope, embankment and cutting in special land area, earthquake area and Rain Water area. In landslide treatment is a common means of application. In this paper, the interaction mechanism between pile-slab structure and rock and soil is studied and the optimum design of the embedded depth of pile-slab structure is analyzed. The research of pile-slab structure in this paper includes the following contents and conclusions: 1) the research of pile-body embedded mode in pile-slab structure. The shear force between strips is determined by Moor-Coulomb criterion, and the traditional transfer coefficient method is improved. By analyzing the different changes of bending moment and displacement of pile body under three conditions: free, hinged and fixed, and comparing the applicable conditions of K method and M method, we can find out the reasonable inlay condition and embedded form of pile body based on the theory of soil arch effect. The mechanism of pile-slab-rock-soil interaction is studied. The stress transfer mechanism of pile-slab structure with different plate positions is analyzed, and the mechanical model of rock and soil between piles and plates is established according to the theory of "Presch unload arch", and the numerical analysis is carried out. Considering the influence of rock and soil on pile-slab structure and soil-arch effect under static and seismic action, the design of pile-slab structural members is compared and analyzed according to the principle of soil-arch effect and the change of plate position. Through the numerical simulation of the internal force change of the pile-plate structure in front and back of the pile, the rational suggestion is put forward. The influence of the embedded depth of the pile body on the stability of the landslide is analyzed by FLAC 3D numerical simulation. When the length of the fixed segment is 1 / 2 / 1 / 3 of the total length of the pile, the method of equivalent beam is used to verify it. In this paper, a simple method is presented to fit the depth of the pile body embedded in engineering.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU435

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