滑坡治理中梁式结构的载荷作用分析
文献类型：学位论文
| 作者 | 袁方 |
| 学位类别 | 硕士 |
| 答辩日期 | 2009 |
| 授予单位 | 中国科学院水利部成都山地灾害与环境研究所 |
| 授予地点 | 成都 |
| 导师 | 王全才 |
| 关键词 | 滑坡 抗滑桩 预应力锚索框架梁 有限元 载荷 |
| 其他题名 | Analyzing on Loading of the Beamlike Structure used in Landslide Control |
| 学位专业 | 岩土工程 |
| 中文摘要 | 滑坡灾害分布广、频率高、危害大又难以预测，已成为各国着力研究的问题之一。我国在滑坡防治中，虽已有丰富的经验和较为完整的防治理论；但远未达到完善，尤其是防治工程力学作用机理的分析还有待深入探讨。工程设计目前多以经验为主辅以简化计算，而少有可靠的方法直接运用；这往往导致防治工程过于保守浪费或治理不当存有安全隐患。抗滑桩和框架梁是滑坡防治中最常用的工程结构形式，其载荷分析尤其是与岩土体的相互作用分析对防治结构的内力计算至关重要，进而决定着防治工程的合理与否及经济性。 本文对滑坡治理中特殊的梁式结构的载荷作用进行了理论分析、有限元模拟并将结果与实测资料进行对比分析；对抗滑桩的荷载分布形式进行了探讨，介绍了框架梁改进计算方法和有限元方法在抗滑工程中的应用。 通过研究发现；相同条件下矩形荷载得出的桩身内力最大、三角形最小、梯形介中，其差别在弯矩中要比剪力中更显著。相比之下，梯形更适应于一般情况；且梯形载荷的集度比在2.0～3.0范围内更符合实际情况。竖向位移最大值在桩顶短边，抬升和下沉量近似相等；土体有类似小位移且影响范围桩前大桩后小。横向位移较小，最大值在桩身与滑面接触的角点上。中间主应力不可忽略，可以允许桩周岩土出现局部塑性区，桩土共同作用的影响范围远大于锚固深度，弹性模量越大的岩土体将有利于抗滑桩承受更大的滑坡推力。 对于预应力锚索框架梁；用本文得出的结果与实测值具有相似的波动变化趋势，其值总体偏大但在梁的中部偏小。有限元结果和实测曲线完全一致，误差8%左右；地基反力呈现锚索点(节点)处具有峰值的波动状态，节点附近地基反力值较大，随着离开节点而快速减小；在相邻节点的中部具有最小值。地基系数k值越大，锚索影响范围越小，地基反力的波形越显著。梁下地基反力均匀分布的假设只有在软弱地基才可用，对于岩性较为完好的情况，这种假设必将产生很大的误差。 |
| 英文摘要 | Landslide Hazards exist widespread and occur frequently, and together with be hard to forecast, so It has already been one of the key research work allover the world. In China, the theory and technology has a very long distance to the perfect, especially the action mechanism of the project should be studied further, although we have rich experience and prevention and control methods. Nowadays, engineering design is mostly by the engineering experience, this often cause too conservative and wasting or improper governance and hidden safety troubles. Anti-slide pile and prestressed anchor-cable and frame beam are most commonly used in the engineering, and load analysis especial the analysis on the action mechanism between it and the soil is very important to the internal force calculation and determine the rationality and economical efficiency of it. In this paper, load action of the special beamlike structure in landslide control is analyzed by theoretical method and Finite Element Simulation, and comparative analysis is carried between the solution data and measured data. And it also discusses the distribution of the load on the anti-slide pile, and deals with improved calculation method of frame beam and finite element method’s application in anti-sliding engineering. It is found that: In the same condition, the internal force of pile has the maximum under rectangular load, the minimum under triangle load and intermediate value under ladder load. And the difference caused by the distribution form of the load is much bigger in the moment than that in the shear. It proposes the ladder load with 2.0~3.0 is the most tally with the actual situation among the commonly used linear load. The max vertical displacement occurred in the short side on the top of the pile and the soil has the same small displacement (bigger in front side of the pile). Transverse displacement is small and the maximum occurred in the corner of the pile and the slip surface. And the intermediate principal stress can not be neglected, partial plastic area can also exist in the soil around the pile. The influence scope of the interaction between pile and soil is much bigger than the anchorage depth, and the bigger elastic modulus will better for the pile. And for prestressed anchor-cable and frame beam, the result gotten by the improved calculation method has the similar fluctuation varying trend with the measured value, and its value is bigger except in the middle of the beam. Finite element result and measured value shows complete agreement in results, and the deviation is only about 8%. The regularity of the foundation pressure is as follows: peak value on the joints, the value decreases when be far away the joint, the minimum appeared in the middle between the joints. And the bigger foundation coefficient the soil has, the smaller the influence scope is and the waveform is much significant. The hypothesis of uniform distribution of the foundation pressure can only be used in the soft foundation |
| 学科主题 | 岩土力学 |
| 语种 | 中文 |
| 公开日期 | 2010-10-13 |
| 分类号 | TU3;U44 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/2169]  |
| 专题 | 成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前） |
| 推荐引用方式 GB/T 7714 | 袁方. 滑坡治理中梁式结构的载荷作用分析[D]. 成都. 中国科学院水利部成都山地灾害与环境研究所. 2009. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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