【作者】 姜在田；

【导师】 方磊；

【作者基本信息】 东南大学 ， 岩土工程， 2004， 硕士

【摘要】 本文在总结填石路堤压实机理和质量检测的发展研究状况及存在问题的基础上,阐述了影响填石路堤压实效果的各种因素和填石路堤的各种现场压实的检测方法。简单介绍了离散单元法的发展历史及现在的发展状况,阐述了离散单元法的基本原理、基本参数和计算方法。针对粗粒料压实的工程力学性质,为了比较真实的模拟粗粒料从摊铺到整平的一系列过程,考虑这一过程中出现的位移不连续应力连续的特点,采用了离散单元法,在一些假设条件下,对粗粒料的压实过程进行了数值模拟,明确提出了影响粗粒料压实的关键因素—破碎率,并对其它影响填石路堤压实效果因素也进行了定性分析。作者把振动压路机和有待压实的粗粒料视为三自由度的振动体系,探讨了压实计的工作原理,对压实计本身存在的不足之处,通过振动理论,采用差分的方法进行了分析,提出了改进措施。本文通过对填石路堤的现场检测试验的试验结果进行了分析和总结,考虑检测的难度,、检测速度以及检测效果,明确提出了填石路堤的质量检测方法和质量控制标准。更多还原

【Abstract】 Basing on the summary of history, research fields of compact mechanism and effect test of filling-stone subgrade and existing problems in Geotechnical Engineering field, the influence factor of compaction effect and every kind of examination method of quantity examine on the spot of filling-stone subgrade are introduced.The summary of history and research fields of discrete element method are introduced, furthermore, the basic theory, basic parameter and calculate method of discrete element method also are brought forward.In order to simulation coarse-grained soil from laying open and trimming to compacting process ,for the sake of the displacement not continuously but stress continuously ,the author don’t adapt the basic theories that adopt tiny particle soil’s press and basic mechanics model, according to the coarse-grained soil engineering mechanics character .the author adapt the discrete element method (DEM) to simulation the process of compaction, not only put forward to affecting coarse-grained soil compaction a key factor —fragmentation ratio clearly ,but also qualitative analysis the result factor of coarse-grained soil compaction . Taking the dynamics of vibratory roller and the coarse-grained soil as a integer which is three-degree-of-freedom vibro-impact system, the author research the Compaction Meter work mechanism. the disadvantage of the Compaction Meter and ameliorate measure are brought forward .In order to study the detect method of coarse-grained soil compaction, a large number of tests on the spot are completed. the test result is analyzed According to the difficult of test ,the rapid of test and the effect of test ,the quality of control and the quality of detect method are put forward in filling-stone subgrade .更多还原