全埋式双排抗滑桩支护结构受力机理实验研究
文献类型：学位论文
| 作者 | 刘正梁 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008 |
| 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 | 孔纪名 |
| 关键词 | 双排桩 物理模型实验 滑坡推力分配 有限元法 |
| 学位专业 | 岩土工程 |
| 中文摘要 | 我国是一个多山的国家，斜坡是山区居民生存的重要环境。随着重大基础设施项目的增多和山区城市建设等工程活动对斜坡的挖掘，往往会诱发大量的滑坡。排桩就是某种桩型按比例布置组成的滑坡支护结构，由于其自身结构的优点，将在滑坡治理工程中广泛应用。目前，对双排桩支护结构的受力和变形研究还有待进一步完善，研究滑坡推力在排桩间的分配已成为重要的课题。 室内模型实验方法是进行排桩一滑坡体系相互作用机理研究的重要方法。本文利用中国科学院成都山地灾害与环境研究所滑坡实验平台，对桩顶非连接式的双排桩支护结构进行了室内模拟实验。通过对影响排桩一滑坡体系受力的几个因素的实验研究，得到了在适宜排距情况下，滑体填土性质是影响排桩受力的重要影响因素，而桩径的改变对排桩一滑坡体系受力影响不大的结论，为以后的工程设计和研究提供了依据。 通过使用ANSYS软件，对排桩一滑坡体系实验进行有限元数值模拟。将滑体受推力作用作为轴对称问题考虑，土体采用Drucker-Prager弹塑性和相关联流动准则，排桩作为线弹性体考虑的三维实体数值模拟。 结合室内模型实验，对有限元结果进行了分析。将有限元模拟结果荷载一位移曲线无量纲化与实验对比，具有共同特征。排桩桩顶位移的随荷载比值表明，在加载初期，第一排桩承担主要的荷载，加载一段时间后，排桩支护结构整体受力体系发挥作用，此时第二排桩逐渐承担部分荷载。模型实验的排桩桩顶位移随荷载比值以及数值模拟的排桩自由段桩身位移随荷载比值的分布特点基本揭示了非连接式双排桩支护结构在滑坡推力分配上具有相似的规律。在给定的排桩中心距为4倍桩径的条件下，模型实验双排桩的第一排桩与第二排桩分担的滑坡推力比值为2：1，而数值模拟结果表明桩径大小对分配比例有一定的影响，第一排桩与第二排桩分担的滑坡推力比值与桩径大小成线性正相关；对模拟结果的位移场进行分析，发现在加载的过程中，滑体表面的土体呈椭圆型向主滑方向传递荷载；双排桩-滑坡模型的最大位移变形量出现在滑坡体后缘，排桩之间的位移变形次之，滑坡体前缘的变形量最小，这与模型实验的结果比较吻合。 |
| 英文摘要 | China is a mountainous country, where slope is important living environment for mountain residents. Great deal of landslides would be caused with the increased significant infrastructure projects and other projects. And Pile-row, an anti-landslide structure composed by arranged of piles, was widely used in landslide control projects due to its advantages. At present, the studies on the double-row piles supporting structure of the force and deformation need to be further improved., and the research on the pile distribution in the landslide thrust has become a very important topic.The physical model experiment is the important method to investigate pile-landslide system interaction mechanism. In this paper, experiments were done to simulate the pile of non-connected double-row piles supporting structure, with the support of landslide experimental platform in Chengdu Institute of Mountain Hazards and Environment, CAS. And the analysis result of the experiments shows that in the appropriate row-distance circumstances, the character of the filling soil is an important effect factor which influence the force of the piles, and the change of pile diameter has little effect on the force of the pile-landslide system. The conclusion provide a great supply in engineering design.With the support of ANSYS software, a finite element numerical simulation is applied to the pile-landslide experimental system. 3D numerical simulation is based on the following condition: Landside mass bearing the thrust of the role as axisymmetric problem, soil adopt the raw of Drucker-Prager elasto-plastic and associated flow guidelines, a pile as elastomer .Combining with the physical model experiments, the results of simulation were analyzed in the paper.: common features were found in the load- displacement curves got from experiment and simulation in the ANSYS. And the ratio of the top displacement of the pile-row and the load shows that, the first row of piles bears the main load in the initial loading, and the second row of piles gradually bears a part of the load with the loads go on, during which time, the overall system of supporting structure of the piles plays its role. The distribution features of the ratio, of the top displacement of the pile-row and the load in the model experiment, and of the displacement of the free length pile numerical simulation, basically reveal regularity that there is a similarity exist in the distribution of the pile landslide thrust .The landslide thrust ratio between the first row and the second row of double-row piles in the experimental model was 2:1 under the conditions of being ranked centre distance equal to four times the diameter of the pile. The numerical simulation results show that the pile diameter size has an impact on the landslide thrust distribution between piles, and the landslide thrust ratio between the first row and the second row of double-row piles has a linear correlation to the pile diameter size. The analysis of the displacement field of the simulation results shows that, the soil of sliding surface transfer load to the main direction of sliding with an elliptical shape in the process of loading. And the posterior edge has the biggest landslide deformation displacement , the middle of the piles follows, and the front of landslides has the smallest deformation displacement. These results relatively coincide with the model experimental. |
| 学科主题 | 岩土力学 |
| 语种 | 中文 |
| 公开日期 | 2010-10-14 |
| 分类号 | TV5;P63 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/2191]  |
| 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 | 刘正梁. 全埋式双排抗滑桩支护结构受力机理实验研究[D]. 成都. 中国科学院水利部成都山地灾害与环境研究所. 2008. |
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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