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SOIL MECHANICS - CHAPTER 38

BẢNG cọc TƯỜNG TRONG ĐẤT lớp Đối với một bức tường đống tờ trong một lớp đất, các phương pháp phân tích là giống như một bức tường trong đất đồng nhất, như xem xét trong chương trước. Sự khác biệt chính là tính toán của những căng thẳng ngang vào tường. | Chapter 38 SHEET PILE WALL IN LAYERED SOIL For a sheet pile wall in a layered soil the method of analysis is the same as for a wall in homogeneous soil as considered in the previous chapter. Figure 38.1 Layered soil. The main difference is that the computation of the horizontal stresses against the wall is more complicated. The computation can best be performed using a computer program. In this chapter a simple program is presented using Blum s method. The complications are that the weight and the properties of the various layers may be different and the zero level of the groundwater may also be different for each layer. The simplest approach is to consider the determination of the horizontal stresses against the wall as a separate problem that precedes the analysis of the sheet pile wall. In principle these stresses can easily be determined by analyzing the stresses from the top of the soil downward in each step adding the weight and using the appropriate values of the lateral stress coefficients. The horizontal effective stress follows from ơ zz ơzz p and the horizontal effective stress ơ xx follows from the formula for active or passive earth pressure. The horizontal total stress finally is obtained by adding the pore pressure ơxx ơ xx p. At the interfaces between succeeding layers the horizontal total stress may be discontinuous because the stress coefficients may be discontinuous. 38.1 Computer program 100 CLS PRINT Sheet pile wall in layered soil NN 1000 110 PRINT Blum PRINT 120 DIM D 20 Z 20 CA 20 CP 20 130 DIM GDL 20 GNl 20 Wl 20 GDR 20 GNR 20 WR 20 140 DIM M NN Q NN F NN P NN U NN 150 INPUT Depth of anchor m . DA 160 INPUT Number of layers . N 170 Z 0 0 GW 10 FOR I 1 TO N CLS PRINT Layer I PRINT 180 INPUT Thickness m . D I 190 INPUT Cohesion kN m2 . CC I 219 Arnold Verruijt Soil Mechanics 38. SHEET PILE WALL IN LAYERED SOIL 220 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 .