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SOIL MECHANICS - CHAPTER 36

Một cách hiệu quả để giữ lại một khối lượng đất là bằng cách cài đặt một bức tường thẳng đứng bao gồm các yếu tố dài mỏng (thép, bê tông hoặc gỗ), đang được hướng vào mặt đất. Các yếu tố thường được nối với nhau bằng các khớp, bao gồm các hình thức đặc biệt của phần tử ở hai đầu. So với một bức tường khổng lồ (bê tông hoặc đá), một đống tờ tường là một cấu trúc linh hoạt, trong khoảnh khắc uốn sẽ được phát triển bởi tải trọng bên, và cần được thiết. | Chapter 36 SHEET PILE WALLS An effective way to retain a soil mass is by installing a vertical wall consisting of long thin elements steel concrete or wood that are being driven into the ground. The elements are usually connected by joints consisting of special forms of the element at the two ends. Compared to a massive wall of concrete or stone a sheet pile wall is a flexible structure in which bending moments will be developed by the lateral load and that should be designed so that they can withstand the largest bending moments. Several methods of analysis have been developed of different levels of complexity. The simplest methods that will be discussed in this chapter are based on convenient assumptions regarding the stress distribution against the sheet pile wall. These methods have been found very useful in engineering practice even though they contain some rather drastic approximations. 36.1 Homogeneous dry soil A standard type of sheet pile wall is shown in Figure 36.1. The basic idea is that the pressure of the soil will lead to a tendency of the flexible wall for displacements towards the left. By this mode of deformation the soil pressures on the right side of the wall will become close to the active h T Figure 36.1 Anchored sheet pile wall. state. This soil pressure must be equilibrated by forces acting towards the right. A large horizontal force may be developed at the lower end of the wall embedded into the soil on the left side by the displacement. In this part passive earth pressure may develop if the displacements are 202 Arnold Verruijt Soil Mechanics 36. SHEET PILE WALLS 203 sufficiently large. The usual schematization is to assume that on the right side of the wall active stresses will be acting and below the excavated soil level at the left side of the wall passive stresses will develop. Because the resulting force of the passive stresses is below the resulting force of the active stresses complete equilibrium is not possible by these stresses .