快速液压夯实机夯实效果的颗粒离散元分析及试验研究

发布时间：2018-06-01 22:25

本文选题：快速液压夯实 + 夯实效果　；参考：《长安大学》2014年硕士论文

【摘要】：目前在高路公路的路堤填筑中，由于传统压实技术在施工条件和压实效果方面的限制，可能会引起路面的工后沉降大，路基承载力不足。快速液压夯实法是一种路基填土压实的新型施工技术，该技术填补了表层压实技术、振动压实和强夯之间的空白，其应用主要是快速提高公路路基的压实度，消除工后沉降。因此，本文对快速液压夯实的夯实机理进行了分析，采用颗粒离散元方法，对快速液压夯实在公路路基夯实效果方面进行了数值模拟，模拟并分析了动力夯击对桥头的影响规律，在此基础上，开展了快速液压夯实在不同影响因素下的室内足尺试验，并对数值模拟的相关结果进行了验证，主要研究内容如下：（1）分析了快速液压夯实技术的加固机理和特点，认为可用强夯的冲击波理论解释快速液压夯实法的加固机理。（2）通过颗粒流离散元数值计算，得出在不同影响因素（不同锤重、不同落锤高度、不同夯击频率、不同锤头）情况下对路基土夯实的效果，计算不同底面的击实头动力夯实对路基一侧桥基的影响，，确定较适合桥头处治的夯锤底面形状及适合桥头处治的安全夯击距离的范围。（3）通过室内足尺试验研究了HHT-3液压夯实机在不同落锤高度、不同布设方式及不同夯板下对路基回填土夯实的效果及性能，将试验到的结果与数值模拟得到的相关结果进行分析比对，结果表明颗粒流方法具有一定的工程应用价值。（4）提出路基土快速液压夯实施工方案，为工程施工提供参考依据。
[Abstract]:At present, due to the limitation of traditional compaction technology in construction conditions and compaction effect, the post-construction settlement of pavement may be large and the bearing capacity of roadbed will be insufficient in the course of embankment filling of high highway. Rapid hydraulic compaction is a new construction technology for subgrade fill compaction, which fills the gap between surface compaction technology, vibration compaction and dynamic compaction. Its application is mainly to improve the compaction degree of highway subgrade and eliminate post-construction settlement. Therefore, the mechanism of rapid hydraulic ramming is analyzed in this paper, and the numerical simulation of the effect of rapid hydraulic ramming on highway roadbed is carried out by using particle discrete element method. The influence law of dynamic tamping on bridge head is simulated and analyzed. On this basis, the indoor full-scale test of rapid hydraulic tamping under different influence factors is carried out, and the relevant results of numerical simulation are verified. The main research contents are as follows: 1) the reinforcement mechanism and characteristics of the rapid hydraulic ramming technology are analyzed, and the shock wave theory of dynamic compaction can be used to explain the reinforcement mechanism of the rapid hydraulic compaction method. 2) through the numerical calculation of discrete element of particle flow, the effect of compaction on subgrade soil under different influence factors (different hammer weight, different drop weight, different tamping frequency, different hammer head) is obtained. The influence of dynamic compaction on one side of the subgrade is calculated, and the shape of the bottom surface of the rammer and the range of the safe tamping distance suitable for the treatment of the bridge head are determined. This paper studies the effect and performance of HHT-3 hydraulic ramming machine on embankment backfill under different height of drop hammer, different layout and different compaction plate through indoor full-scale test. The experimental results are compared with those obtained by numerical simulation. The results show that the particle flow method has some engineering application value. A quick hydraulic ramming construction scheme for subgrade soil is put forward, which provides a reference for engineering construction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.12;U412.366

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