砂垫层对排水板地基固结效率的影响及设计方法
发布时间：2019-06-14 00:28
【摘要】：针对排水固结软基处理技术中水平向排水砂垫层的设计方法问题,开展流-固耦合固结的三维有限元分析,研究砂垫层渗透系数、厚度和宽度对塑料排水板地基固结的影响规律,揭示固结效率取决于砂垫层参数与土性参数、塑料排水板参数的相关性。据此,将塑料排水板地基径、竖向排水固结解析解等效为纯竖向排水固结解析解,推导能够反映土性参数和塑料排水板参数对地基固结影响的等效竖向渗透系数,并将其与砂垫层参数合理组合,得到综合考虑砂垫层、塑料排水板和土体共同作用对地基固结效率影响的集总参数。通过大量的三维有限元计算,分析该集总参数与地基固结效率之间的关系。给出塑料排水板地基中砂垫层的设计步骤,并结合某工程实例的验算验证该设计方法的有效性。研究结果表明:地基固结效率随集总参数的增大呈双曲线形增加,存在一个满足最优固结效率要求的集总参数值,可作为不同土性及塑料排水板参数条件下砂垫层的设计控制指标。
[Abstract]:Aiming at the design method of horizontal drainage sand cushion in drainage consolidation soft foundation treatment technology, the three-dimensional finite element analysis of fluid-solid coupling consolidation is carried out, and the influence of permeability coefficient, thickness and width of sand cushion on the consolidation of plastic drainage plate foundation is studied. It is revealed that the consolidation efficiency depends on the correlation between sand cushion parameters and soil parameters, and plastic drainage plate parameters. Based on this, the analytical solution of foundation diameter and vertical drainage consolidation of plastic drainage plate is equivalent to the analytical solution of pure vertical drainage consolidation, and the equivalent vertical permeability coefficient which can reflect the influence of soil parameters and plastic drainage plate parameters on foundation consolidation is derived, and the lumped parameters considering the influence of sand cushion, plastic drainage plate and soil on the consolidation efficiency of foundation are obtained. Through a large number of three-dimensional finite element calculations, the relationship between the lumped parameters and the consolidation efficiency of the foundation is analyzed. The design steps of sand cushion in plastic drainage board foundation are given, and the effectiveness of the design method is verified by the checking calculation of an engineering example. The results show that the consolidation efficiency of foundation increases hyperbolic with the increase of lumped parameters, and there is a lumped parameter value that meets the requirements of optimal consolidation efficiency, which can be used as the design control index of sand cushion under different soil properties and plastic drainage board parameters.
【作者单位】： 河海大学岩土力学与堤坝工程教育部重点实验室岩土工程科学研究所;
【基金】：国家自然科学基金资助项目(51278171) 中央高校基本科研业务费专项资金资助项目(2015B06014)~~
【分类号】：TU470
本文编号：2498947
[Abstract]:Aiming at the design method of horizontal drainage sand cushion in drainage consolidation soft foundation treatment technology, the three-dimensional finite element analysis of fluid-solid coupling consolidation is carried out, and the influence of permeability coefficient, thickness and width of sand cushion on the consolidation of plastic drainage plate foundation is studied. It is revealed that the consolidation efficiency depends on the correlation between sand cushion parameters and soil parameters, and plastic drainage plate parameters. Based on this, the analytical solution of foundation diameter and vertical drainage consolidation of plastic drainage plate is equivalent to the analytical solution of pure vertical drainage consolidation, and the equivalent vertical permeability coefficient which can reflect the influence of soil parameters and plastic drainage plate parameters on foundation consolidation is derived, and the lumped parameters considering the influence of sand cushion, plastic drainage plate and soil on the consolidation efficiency of foundation are obtained. Through a large number of three-dimensional finite element calculations, the relationship between the lumped parameters and the consolidation efficiency of the foundation is analyzed. The design steps of sand cushion in plastic drainage board foundation are given, and the effectiveness of the design method is verified by the checking calculation of an engineering example. The results show that the consolidation efficiency of foundation increases hyperbolic with the increase of lumped parameters, and there is a lumped parameter value that meets the requirements of optimal consolidation efficiency, which can be used as the design control index of sand cushion under different soil properties and plastic drainage board parameters.
【作者单位】： 河海大学岩土力学与堤坝工程教育部重点实验室岩土工程科学研究所;
【基金】：国家自然科学基金资助项目(51278171) 中央高校基本科研业务费专项资金资助项目(2015B06014)~~
【分类号】：TU470
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