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效应
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    Random Seismic Analysis of Nonlinear Platform-Fluid- Soil-Pile Systems
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In this paper is presented an analysis of the consolidation and viscous flow oflaterally confined clay layers. It is pointed out that secondary time effects aremainly due to the action of shearing stresses. The write's theory is based onthe assumption, that the clay may be regarded as a Maxwell material. Thedifferential equations for the one dimensional case are solved and the approximatesolutions for the semi infinite mass of clay and for the clay layer with finitethickness are discussed. It is shown that the...

In this paper is presented an analysis of the consolidation and viscous flow oflaterally confined clay layers. It is pointed out that secondary time effects aremainly due to the action of shearing stresses. The write's theory is based onthe assumption, that the clay may be regarded as a Maxwell material. Thedifferential equations for the one dimensional case are solved and the approximatesolutions for the semi infinite mass of clay and for the clay layer with finitethickness are discussed. It is shown that the settlement according to this theoryis always larger than that predicnd by Terzaghi or Biot. It is pointed out thatsecondary time effects should start in the early beginning of the process of con-solidation. The final settlement calculated by the write's theory has been foundto be one to three times that given by Terzaghi or Biot.

本文对受侧限的粘土层的固结和滞流进行了分析,并指出了次时间效应的发生主要是由于剪应力的作用。笔者以粘土可认为是一种麦克斯威尔材料的假设作为他的理论基础,解算了单向情况的微分方程,讨论了无限粘土体及有限厚度粘土层的近似解。本文又指出,根据此理论所得的沉陷总是比特扎基和比阿所预估的要大些;次时间效应应该在固结过程的初期就开始,算出的最后总沉陷为特扎基和比阿给出的一到三倍。

A and B dams(60 m and 46 m height respectively)both are earth structures constructed by dumping earth into ponded water.Because of the stability analysis of slows of these dams at the end of construction is an important control factor,thus in this paper describes the method of stability analysis based on the effective stress,which consists of three parts:. 1.The selection of indices of physical and mechanical properties of earth materials including laboratory determination of these property indices and their...

A and B dams(60 m and 46 m height respectively)both are earth structures constructed by dumping earth into ponded water.Because of the stability analysis of slows of these dams at the end of construction is an important control factor,thus in this paper describes the method of stability analysis based on the effective stress,which consists of three parts:. 1.The selection of indices of physical and mechanical properties of earth materials including laboratory determination of these property indices and their correlation,especially the determina- tion of the coefficients of pore-pressure and dissipation; 2.Procedures in calculating dissipation of pore-pressure in dam body during and at the end of construction by different methods—unsaturated two-dimensional solution,unsaturated one- dimensional solution,saturated two-dimensional solution and non-dissipation of pore-pressure; 3.Results of above 4 calculated methods of pore-pressure and their comparison. Finally,we suggested to apply unsaturated two or one dimensional solutions,depending upon the size of section of dam.

本文以两个水中填土坝——A 水库土坝(高60米)、B 水库土坝(高46米)作为实例,用有效应力法进行了施工期和施工完毕时坝坡的稳定分析.主要内容分为坝体土料物理、力学性质指标的选择,包括士料的试验方法和指标的整理步骤,特别是孔隙压力系数和消散系数的确定;施工期及土坝刚建成时坝体孔隙压力消散的几个计算方法和步骤,即三相二元、三相一元,二相二元问题和孔隙压力不消散等四种计算方法;并结合有效应力稳定分析方法,提出了各种计算方法所得成果的比较.最后根据坝体的大小,推荐采用三相二元或三相一元问题的解答,确定施工期的孔隙压力大小.

This paper presents an efficient method for analysing elastic stability of ring-stiffened cone-cylinder jointed shell under external hydrostatic pressure. The method is based on the following concepts: (1 ) semi-bending moment theory combined with boundary effect theory of the cone- cylinder Junction (2 ) the minimun potential energy principle with the tangential displacement as the fundamental variable. The resultant expression of critical pressure is similar to the well- known Mises formula of cylinder...

This paper presents an efficient method for analysing elastic stability of ring-stiffened cone-cylinder jointed shell under external hydrostatic pressure. The method is based on the following concepts: (1 ) semi-bending moment theory combined with boundary effect theory of the cone- cylinder Junction (2 ) the minimun potential energy principle with the tangential displacement as the fundamental variable. The resultant expression of critical pressure is similar to the well- known Mises formula of cylinder shell. The characteristic- parameter πR/L in Mises formula is replaced by αR/L in which the coeffieient α depents ou geometry characteristic of jointed shell. The conception of "equivalent cylindrical shell" results, therefore, from the si- milarity Detween two formulas. When the cone-cylinder jointed shell is concave, the asymptotic analysis of funda- mented equation exhibits an unfavorable geometric relation which will reduce greatly the buckling resistance of shell membrance. This unfavorable shape of concave jointed shell has been discovered early in our research(2) work, here it is once again demonstrated.

本文提出了分析环肋锥-柱结合壳在静水外压作用下弹性稳定性的一个有效方法。该方法的基本思想是:(1)联合运用半弯矩理论和结合边附近边界效应理论;(2)利用以切向位移作为基本未知数的最小势能原理。所得到的临界压力表达式和熟知的圆柱壳 Mises公式相似。式中的特征值αR/L取代了Mises公式中的πR/L,α是一个与结合壳的几何参数有关的系数。因此,由这两个公式的类比引出了“相当柱壳”概念。 对于凹式锥-柱结合壳,从本文的基本方程式出发,用渐近分析的方法又一次导出了其几何构造上的一个不利形式。当这个不利形式被满足时,壳皮膜力抵抗失稳的能力将大大降低。凹式结合壳的这种不利形式早在我们的工作[2]中已经发现,这里又一次得到证明。

 
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