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Several factors including foundation base friction, skirt depth, skirt side roughness, skirt stiffness and soil compressibility were studied and incorporated in the equation.


Soil compressibility is affected by both internal soil factors and external factors.


Compression The process which damages soil around infrastructures called compaction starts with soil compressibility or loss of soil volume.




 The choosing value standards of calculating soil compressibility in a pressure period in lately issued (GBJ789)are different from that in former issued.This paper tries to find out the changing regularity of relative deviation by calculating the settlement quantity of foundation soil according to two different choosing value standards and comparing them with each other.  在《建筑地基基础设计规范》(GBJ789)中 ,计算土的压缩性指标时压力段取值标准与旧规范不同。本文主要是用这两种不同取值标准计算地基土的沉降量并进行比较 ,得出相对偏差的变化特点。  The general relationships among total vertical stress, effective vertical stress, pore water pressure, void ratio and settlement in 1D large strain consolidation of soft clay are presented. By making the assumptions on soil compressibility and permeability, an equation governing 1D nonlinear large strain consolidation in terms of excess pore water pressure is derived in Lagrangian coordinate and the corresponding analytical solution obtained. The behavior of 1D nonlinear large strain consolidation... The general relationships among total vertical stress, effective vertical stress, pore water pressure, void ratio and settlement in 1D large strain consolidation of soft clay are presented. By making the assumptions on soil compressibility and permeability, an equation governing 1D nonlinear large strain consolidation in terms of excess pore water pressure is derived in Lagrangian coordinate and the corresponding analytical solution obtained. The behavior of 1D nonlinear large strain consolidation is then discussed and compared with conventional small strain consolidation theory. The analytical solution is valuable for the verifications of many other numerical solutions to the large strain consolidation problems.  给出了软黏土一维大应变固结中土体总应力、有效应力、孔隙水压力、孔隙比和沉降等一般相互关系,通过对土体压缩性和渗透性的假定得到了拉格朗日坐标下以超静孔压为变量的一维非线性大应变固结方程及其解析解。利用此解分析了土体一维非线性大应变固结性状,并与传统的小应变固结理论作了比较。此解也可用于对大应变固结问题的各种数值解法的验证。  Based on the general theory for 1D nonlinear large strain consolidation of soft soil, the governing equation in the form of excess pore water pressure was established in lagrangian coordinate, in which timedepending loading and selfweight of clay etc. can be taken into consideration. By making the assumptions on the soil compressibility and permeability, the corresponding analytical solution was obtained, through which the behavior of 1D large strain consolidation in one step loading was then investigated.... Based on the general theory for 1D nonlinear large strain consolidation of soft soil, the governing equation in the form of excess pore water pressure was established in lagrangian coordinate, in which timedepending loading and selfweight of clay etc. can be taken into consideration. By making the assumptions on the soil compressibility and permeability, the corresponding analytical solution was obtained, through which the behavior of 1D large strain consolidation in one step loading was then investigated. It shows that the rate of settlement is greater than the rate of excess pore water pressure dissipation during large strain consolidation, the dissipation of excess pore water pressure will be slower with the increase of loading, and the selfweight of clay has great influence on the void ratio distribution. The proposed analytical solution is also can be used to verify other numerical solutions of large strain consolidation problem.  基于软黏土一维非线性大应变固结基本理论,建立了能考虑荷载变化、土层自重等因素影响的拉格朗日坐标下以超静孔压u为变量的一维大应变固结控制方程,并通过对土体压缩性和渗透性的假定获得了方程的解析解。基于此解,分析了单级等速加荷条件下软黏土一维大应变固结性状。从中可见,大应变固结过程中土体变形的发展要快于超静孔压的消散;荷载增大,超静孔压消散趋慢;加荷速率越大,土体固结越快;考虑土层自重影响时孔隙比的分布更为合理。此外,本文的解析解也可用于验证各种大应变固结数值解法的正确性。   << 更多相关文摘 
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