强夯地基加固机理及其工程试验研究
发布时间：2018-08-22 09:50
【摘要】：近年来,强夯法的理论及应用研究也逐步展开,虽然存在一定量的宏观理论解释,而土体有其特殊性质,从微观角度来解释强夯加固机理的理论更为合理。本文充分结合实际工程辽宁北镇满族高级中学食堂地基加固工程问题的需要,对于新近回填土为主体的强夯加固机理及现场工程试验做出评价分析与研究,重点开展以下工作：通过几种常见强夯加固理论的比较分析,对于本文工程实例中地基土的特性(新近回填土)做出理论选择；并在此基础上提出有效加固深度的经验公式的范围系数p,以及在简化地基加固模式下的有效加固深度计算公式；与夯击能、夯击次数、夯击间距等设计重要因素进行对比分析,对于类似工程给出参考。本文通过平板载荷试验、触探试验、瑞利面波试验对新近土的回填工程强夯施工结果进行检测,得出经过强夯加固后地基承载力值符合设计值要求；同时进一步验证本文提出的有效加固深度修正系数及简化公式的计算值是否达到设计标准及影响因素分析。鉴于现场工程试验的结果数量有限,并且施工中受天气、人员等因素影响,本文重点将数值模拟的结果与现场检测数据作比较。通过有限差分软件来模拟强夯加固过程,观察填土地基的竖向位移变化和夯击后的应力应变变化,以及分析弹塑性区域相应变化是为了判断夯击后的最大影响深度的界限值,使得简化公式及试验结果的准确度再次得到验证。本文对强夯法加固地基的设计理论、现场检测试验和数值模拟进行了较为系统的研究,得出的结论对强夯法加固地基的进一步研究和工程应用有一定的帮助。
[Abstract]:In recent years, the research on the theory and application of dynamic compaction has been carried out step by step. Although there is a certain amount of macroscopic theoretical explanation, and soil has its special properties, it is more reasonable to explain the mechanism of dynamic compaction from the microscopic point of view. In this paper, according to the needs of the actual project, the reinforcement mechanism of dynamic compaction and the field engineering test, which is the main body of the new backfill soil, are evaluated and studied in order to meet the needs of the foundation strengthening project of Manchu senior middle school in Beizhen, Liaoning Province. The main work is as follows: through the comparison and analysis of several common dynamic compaction reinforcement theories, the characteristics of foundation soil (recently backfilled) in the engineering example of this paper are selected theoretically; On this basis, the range coefficient p of the empirical formula for effective reinforcement depth and the calculation formula of effective reinforcement depth under simplified foundation reinforcement mode are put forward, which are compared with the important design factors such as ramming energy, tamping times, tamping spacing, and so on. A reference is given for similar projects. Through plate load test, penetration test and Rayleigh surface wave test, the results of dynamic compaction construction of recent soil backfill project are tested, and the results show that the bearing capacity value of foundation strengthened by dynamic compaction meets the requirements of design value. At the same time, it is further verified whether the calculated values of the effective depth correction coefficient and the simplified formula are up to the design standard and the analysis of the influencing factors. In view of the limited number of results of field engineering tests and the influence of weather, personnel and other factors in construction, this paper mainly compares the results of numerical simulation with the field test data. The finite difference software is used to simulate the consolidation process of dynamic compaction, to observe the variation of vertical displacement and stress and strain after tamping, and to analyze the corresponding changes of elastic-plastic region in order to judge the limit value of the maximum influence depth after tamping. The simplified formula and the accuracy of the test results are verified again. In this paper, the design theory, field testing test and numerical simulation of the dynamic compaction method for foundation strengthening are systematically studied, and the conclusions are helpful to the further research and engineering application of the dynamic compaction method.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU472.31
本文编号：2196739
[Abstract]:In recent years, the research on the theory and application of dynamic compaction has been carried out step by step. Although there is a certain amount of macroscopic theoretical explanation, and soil has its special properties, it is more reasonable to explain the mechanism of dynamic compaction from the microscopic point of view. In this paper, according to the needs of the actual project, the reinforcement mechanism of dynamic compaction and the field engineering test, which is the main body of the new backfill soil, are evaluated and studied in order to meet the needs of the foundation strengthening project of Manchu senior middle school in Beizhen, Liaoning Province. The main work is as follows: through the comparison and analysis of several common dynamic compaction reinforcement theories, the characteristics of foundation soil (recently backfilled) in the engineering example of this paper are selected theoretically; On this basis, the range coefficient p of the empirical formula for effective reinforcement depth and the calculation formula of effective reinforcement depth under simplified foundation reinforcement mode are put forward, which are compared with the important design factors such as ramming energy, tamping times, tamping spacing, and so on. A reference is given for similar projects. Through plate load test, penetration test and Rayleigh surface wave test, the results of dynamic compaction construction of recent soil backfill project are tested, and the results show that the bearing capacity value of foundation strengthened by dynamic compaction meets the requirements of design value. At the same time, it is further verified whether the calculated values of the effective depth correction coefficient and the simplified formula are up to the design standard and the analysis of the influencing factors. In view of the limited number of results of field engineering tests and the influence of weather, personnel and other factors in construction, this paper mainly compares the results of numerical simulation with the field test data. The finite difference software is used to simulate the consolidation process of dynamic compaction, to observe the variation of vertical displacement and stress and strain after tamping, and to analyze the corresponding changes of elastic-plastic region in order to judge the limit value of the maximum influence depth after tamping. The simplified formula and the accuracy of the test results are verified again. In this paper, the design theory, field testing test and numerical simulation of the dynamic compaction method for foundation strengthening are systematically studied, and the conclusions are helpful to the further research and engineering application of the dynamic compaction method.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU472.31
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