复杂固结排水系统的研究
发布时间：2018-12-29 13:12
【摘要】：在实际软土地基处理工程中,砂井/排水板打设深度内形成的一般都是多层竖井地基。多层竖井地基固结理论的求解过程,是极为复杂的。求解需要满足土层与土层之间的孔压连续、流量连续条件,以及砂井内部不同层之间的孔压连续、流量连续条件。而由于孔压表达式中存在无穷级数,将使得多层竖井地基的固结度解答存在收敛性问题,这一点,让求解过程变得更为困难。目前的多层竖井地基固结度解答,要么未完全考虑最终固结度的影响因素(井阻、涂抹效应),要么是停滞在双层的结果而无法推广至更多层。本文基于唐晓武的竖井地基固结解,求得了三层以及多层竖井地基固结度的解答,并对收敛性问题进行了分析。 传统海涂围堤以土石结构为主,堤心填石料,堤内填淤泥,形成挡潮闭气结构。目前由于受到国家政策限制以及土石资源的消耗,土石资源已经严重匮乏,充泥模袋作为一种新型的填筑材料应运而生。国内外目前关于土工模袋的研究多集中在模袋的受力、充填、渗透特性,对于模袋土体的固结问题则研究甚少,而关于排水板充泥模袋的固结问题更是未有先例。本文求得了正方形影响区竖井地基固结度的解答,在考虑了边界透水性之后,将其解答应用于排水板充泥模袋固结问题的估算,发现其估算结果与有限元计算结果以及实际室内实验结果一致。 本文的具体工作如下： 1.本文得到了三层竖井地基固结度解答。推导过程中证明了多层竖井地基的正交关系,并求得了不同的边界情况下的三层竖井地基固结度解答。三层竖井地基固结度结果存在不收敛的情况。在GPA/MPA参数异常严重的情况下,固结度将不再收敛。在GPA/MPA参数异常不严重的情况下,可以通过两步控制法改善最终固结度的精度。本章研究了两步控制法的适用范围,并具体阐述了运用两步控制法的操作流程。本文运用两步控制法改善了计算精度,并计算了乐清电厂海堤填筑工程的孔压,得到了与实测结果相吻合的结果。 2.本文求得了多层竖井地基固结度的递推解解答以及扩大矩阵的解答。递推解解答的计算结果表明,由于双曲函数的存在,传递矩阵具有离散性,矩阵的连乘使得传递矩阵的离散性放大、计算误差增加,而判定矩阵本身具有不稳定性,这些原因综合起来导致了结果的不收敛。而通过扩大矩阵能够得到收敛的多层竖井地基固结度解答,其求解关键在于扩大连续矩阵的大小 3.本文利用扩大矩阵的方法求得了多层竖井地基固结度解答的通用表达式。本文以四层竖井地基为例,进行了相关的固结分析。本文将四层竖井地基计算结果与双层竖井地基固结理论计算结果进行了对比验证,结果证明两者得到完全相同的结果。本文进行了四层竖井地基固结性状的计算分析,分析了四层竖井地基参数变化对固结度的影响,提供参考性的结论。 4.本文求得了考虑边界透水性的竖井正方形地基固结度解答。通过等效面积计算,对比了与六边形影响区、圆形影响区结果的差别大小,证明了将正方形影响区简化为圆形影响区会差生较大的误差。在考虑了边界透水性之后,本文将该理论应用于打设排水板充泥模袋体系的固结度估算,得到与室内实验一致的结果。本文利用有限元及正方形影响区竖井地基解答对打设／不打设排水板情况下充泥模袋的固结情况进行了比较,并利用有限元研究了模袋宽高比变化及模袋高度单因素变化对固结速率的影响。经过计算,为工程实际中的模袋宽高比设计提出了宽高比为4：1的设计建议。 5.本文为考虑边界透水性的竖井正方形固结度解答考虑了更为实际的因素,包括不同的渗透系数分布模式以及考虑土体的非线性因素,并得到了相应条件下的固结度表达式。通过非线性固结的参数分析,得出结论,在考虑土体的非线性因素时,土体表面的荷载以及土体的自身属性将影响到整体的固结速度。研究使理论能参照实际,提供多种因素条件下最终固结度的解答,方便与实际结果对照。
[Abstract]:In the actual soft soil foundation treatment project, the sand well/ drainage board is generally formed in the depth of the foundation of the multi-layer shaft. The solution process of the consolidation theory of multi-layer shaft foundation is very complicated. the solution needs to satisfy the continuous and continuous flow conditions of the pore pressure between the soil layer and the soil layer, and the continuous and continuous flow conditions of the pore pressure between the different layers in the sand well. Because of the infinite series in the pore pressure expression, the convergence problem of the consolidation degree of the multi-layer shaft foundation is solved, which makes the solution process more difficult. At present, the consolidation degree of multi-layer shaft foundation is solved, or the influence factor (well resistance, application effect) of the final consolidation degree is not fully considered, or the result of the double layer can not be extended to more layers. In this paper, the solution of consolidation degree of three-layer and multi-layer shaft foundation is obtained based on the consolidation solution of the shaft foundation of the Tang Xiaowu, and the convergence problem is analyzed. The traditional sea-coated dike is mainly composed of soil-rock structure, and the dike core is filled with stone, and the sludge is filled in the bank to form a water-blocking closed-gas junction. As a result of the limitation of the national policy and the consumption of the earth and rock resources, the soil and rock resources have been severely scarce, and the mud-filling mold bag is used as a new type of filling material. At present, the research on the soil-working mould bag at home and abroad is mainly focused on the stress, filling and permeability of the mould bag, and the research on the consolidation of the mould-bag soil is very few, and the consolidation problem of the drainage plate-filling mould bag is not first In this paper, the solution of the consolidation degree of the vertical shaft foundation of the square influence area is obtained. After the boundary water permeability is considered, the solution is applied to the estimation of the consolidation problem of the drainage plate charging die bag, and the results of the estimation and the results of the finite element calculation and the experimental results in the actual room are found. A. The specific work of this article The method is as follows: 1. The three-layer shaft foundation is obtained in this paper. In the derivation, the orthogonal relation of the multi-layer shaft foundation is proved, and the three-layer shaft foundation under different boundary conditions is obtained. The consolidation degree solution. The consolidation degree result of the three-layer shaft foundation does not exist. The condition of convergence. The degree of consolidation is the case where the GPB/ MPA parameter is abnormal. It will no longer converge. The final solid can be improved by a two-step control method in the case of a non-serious GPB/ MPA parameter The application of two-step control method is studied in this chapter, and the two-step control method is described in detail. In this paper, the calculation accuracy is improved by two-step control method, and the hole pressure of the filling project of the embankment in the Leqing Power Plant is calculated, and the results are compared with the measured results. The result of the agreement is as follows: 2. The recursive solution of the consolidation degree of the multi-layer shaft foundation is obtained in this paper. The calculation results of the extended matrix show that, due to the existence of the hyperbolic function, the transfer matrix has the discreteness, the continuous multiplication of the matrix causes the discreteness of the transfer matrix to be amplified, the error is increased, and the decision matrix itself has instability, which can be combined The convergence of the multi-layer shaft foundation with convergence can be obtained by expanding the matrix, and the key to the solution is to expand. The size of the large continuous matrix is 3. The method of expanding the matrix is used to obtain the consolidation of the multi-layer shaft foundation. A general expression of the degree solution. In this paper, a four-layer shaft foundation is used as an example. In this paper, the calculation results of the four-layer shaft foundation and the calculation results of the consolidation theory of the double-layer shaft foundation are compared and verified, and the results prove that both In this paper, the calculation and analysis of consolidation character of four-layer shaft foundation are carried out, and the effect of the change on consolidation degree of four-layer shaft foundation is analyzed. and provides a reference conclusion. The consolidation degree of the square foundation of the well is solved. By the equivalent area calculation, the difference between the results of the hexagonal influence area and the circular effect area is compared, and it is proved that the square influence area is simplified into a circle After considering the water permeability of the boundary, this paper applies the theory to the calculation of the consolidation degree of the bag system with the drainage plate for filling the mud. Based on the results of the agreement with the indoor experiment, this paper makes a comparison of the consolidation of the mud-filled mold bag in the case of the setting/ non-punching drainage board by using the finite element method and the square influence area shaft foundation solution, and studies the change of the aspect ratio of the die bag and the height of the die bag by using the finite element method. The influence of the change of the element on the consolidation rate is calculated, and the design of the aspect ratio of the mode bag in the practical engineering of the project is given. A design proposal with a high ratio of 4: 1 is proposed. 5. In this paper, a more practical factor is taken into account for the solution of the square consolidation of the vertical shaft considering the water permeability of the boundary, including the distribution pattern of different permeability coefficients and the non-linear factors of the soil. The consolidation degree expression under the corresponding conditions is obtained. Through the analysis of the parameters of the non-linear consolidation, it is concluded that the load on the surface of the soil and the self of the soil body when considering the non-linear factors of the soil The properties will affect the consolidation speed of the whole. The study makes the theory reference to the reality and provides the ultimate degree of consolidation under various factors.
【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU472
本文编号：2394872
[Abstract]:In the actual soft soil foundation treatment project, the sand well/ drainage board is generally formed in the depth of the foundation of the multi-layer shaft. The solution process of the consolidation theory of multi-layer shaft foundation is very complicated. the solution needs to satisfy the continuous and continuous flow conditions of the pore pressure between the soil layer and the soil layer, and the continuous and continuous flow conditions of the pore pressure between the different layers in the sand well. Because of the infinite series in the pore pressure expression, the convergence problem of the consolidation degree of the multi-layer shaft foundation is solved, which makes the solution process more difficult. At present, the consolidation degree of multi-layer shaft foundation is solved, or the influence factor (well resistance, application effect) of the final consolidation degree is not fully considered, or the result of the double layer can not be extended to more layers. In this paper, the solution of consolidation degree of three-layer and multi-layer shaft foundation is obtained based on the consolidation solution of the shaft foundation of the Tang Xiaowu, and the convergence problem is analyzed. The traditional sea-coated dike is mainly composed of soil-rock structure, and the dike core is filled with stone, and the sludge is filled in the bank to form a water-blocking closed-gas junction. As a result of the limitation of the national policy and the consumption of the earth and rock resources, the soil and rock resources have been severely scarce, and the mud-filling mold bag is used as a new type of filling material. At present, the research on the soil-working mould bag at home and abroad is mainly focused on the stress, filling and permeability of the mould bag, and the research on the consolidation of the mould-bag soil is very few, and the consolidation problem of the drainage plate-filling mould bag is not first In this paper, the solution of the consolidation degree of the vertical shaft foundation of the square influence area is obtained. After the boundary water permeability is considered, the solution is applied to the estimation of the consolidation problem of the drainage plate charging die bag, and the results of the estimation and the results of the finite element calculation and the experimental results in the actual room are found. A. The specific work of this article The method is as follows: 1. The three-layer shaft foundation is obtained in this paper. In the derivation, the orthogonal relation of the multi-layer shaft foundation is proved, and the three-layer shaft foundation under different boundary conditions is obtained. The consolidation degree solution. The consolidation degree result of the three-layer shaft foundation does not exist. The condition of convergence. The degree of consolidation is the case where the GPB/ MPA parameter is abnormal. It will no longer converge. The final solid can be improved by a two-step control method in the case of a non-serious GPB/ MPA parameter The application of two-step control method is studied in this chapter, and the two-step control method is described in detail. In this paper, the calculation accuracy is improved by two-step control method, and the hole pressure of the filling project of the embankment in the Leqing Power Plant is calculated, and the results are compared with the measured results. The result of the agreement is as follows: 2. The recursive solution of the consolidation degree of the multi-layer shaft foundation is obtained in this paper. The calculation results of the extended matrix show that, due to the existence of the hyperbolic function, the transfer matrix has the discreteness, the continuous multiplication of the matrix causes the discreteness of the transfer matrix to be amplified, the error is increased, and the decision matrix itself has instability, which can be combined The convergence of the multi-layer shaft foundation with convergence can be obtained by expanding the matrix, and the key to the solution is to expand. The size of the large continuous matrix is 3. The method of expanding the matrix is used to obtain the consolidation of the multi-layer shaft foundation. A general expression of the degree solution. In this paper, a four-layer shaft foundation is used as an example. In this paper, the calculation results of the four-layer shaft foundation and the calculation results of the consolidation theory of the double-layer shaft foundation are compared and verified, and the results prove that both In this paper, the calculation and analysis of consolidation character of four-layer shaft foundation are carried out, and the effect of the change on consolidation degree of four-layer shaft foundation is analyzed. and provides a reference conclusion. The consolidation degree of the square foundation of the well is solved. By the equivalent area calculation, the difference between the results of the hexagonal influence area and the circular effect area is compared, and it is proved that the square influence area is simplified into a circle After considering the water permeability of the boundary, this paper applies the theory to the calculation of the consolidation degree of the bag system with the drainage plate for filling the mud. Based on the results of the agreement with the indoor experiment, this paper makes a comparison of the consolidation of the mud-filled mold bag in the case of the setting/ non-punching drainage board by using the finite element method and the square influence area shaft foundation solution, and studies the change of the aspect ratio of the die bag and the height of the die bag by using the finite element method. The influence of the change of the element on the consolidation rate is calculated, and the design of the aspect ratio of the mode bag in the practical engineering of the project is given. A design proposal with a high ratio of 4: 1 is proposed. 5. In this paper, a more practical factor is taken into account for the solution of the square consolidation of the vertical shaft considering the water permeability of the boundary, including the distribution pattern of different permeability coefficients and the non-linear factors of the soil. The consolidation degree expression under the corresponding conditions is obtained. Through the analysis of the parameters of the non-linear consolidation, it is concluded that the load on the surface of the soil and the self of the soil body when considering the non-linear factors of the soil The properties will affect the consolidation speed of the whole. The study makes the theory reference to the reality and provides the ultimate degree of consolidation under various factors.
【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU472
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