This method can be carried out in the continuous construction phase of the analysis of the assumption that the plastic hinge in the support (the first pavement excluded) point between the adjacent support as a simple beam on the role of earth pressure and water pressure, the Bottom road support And between the excavation surface as a single support wall, on which the role of earth pressure and water pressure. The support load obtained by the plastic hinge method includes the load from the adjacent span. This method can be carried out with the Construction process of progressive analysis, excavation to a certain depth can be installed on the next support; a phase of the support force and bending moment may exceed the previous stage of the support force and bending moment and therefore use Maximum support force and bending moment to Design.
Continuous Beam Method with Multi - anchored steel sheet piles
Assuming that the wall is a vertical continuous beam, the bottom of the beam is fixed at a certain point below the excavation surface by the force of water and earth pressure and the supporting force. The net active earth pressure at this point is zero. The Earth pressure acting on the wall depends on At a coefficient which is controlled by the allowable deformation of the wall. The recommended minimum earth pressure is 1.3 times the earth pressure calculated with K.
According to the compressibility of steel sheet piles support, it can be simplified as a rigid support or spring. The deformation of the rigid support is proportional to the force acting on the spring.
Soil support can be simplified in one of three ways:
1, if the net pressure (active pressure at a certain depth - the passive pressure) along the pile length is not 0, then can be ignored embedded part part of the soil as a cantilever structure. This situation often occurs when the embedding depth is Small or the net pressure is particularly large, and the external load is all borne by the support.
2, if the net pressure in the pile length range reduced to 0, then the soil support can be seen as rigid support. This situation often occurs when the embedded depth is large or the net pressure is particularly small, and the external load is shared By the support and the soil. The force of the soil is the shearing force of the support. In this case, it is necessary to ensure that the force in the soil support is not greater than the soil resistance below the support point, if it Is greater than, then we must use the third method.
3. If the net pressure is 0, but the soil resistance below the net pressure of 0 is less than that of the rigid soil, then the reaction force of the soil in the next calculation is numerically equal to the resistance to go. This is Often the case where the embedded depth is just right, and the external load is supported by the steel sheet piles and the soil. Larsen u-type steel sheet piles manufacturers to withstand the soil force is equal to the soil support in the shear force changes .