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哪个是英语高手啊?!帮翻译翻译!! To design the micropile configuration to strengthen the foundation system the load on the footing from columns and filling are calculated and the required frictional resistance of the micropile system is evaluated. The calculations for a footing (2.5 m× 2.0 m) are as follows. The total load coming on the system = column load +fill load = 600 kN + 20 kN/m3 × 6.5 m × 2.5 m × 2.0 m =1250 kN. Required safe bearing pressure = 1250/2.5 × 2 = 250 kPa Safe load on the foundation system = 70 kPa ×2.5 m ×2 m = 350 kN Additional load for which the micropile system is designed = 1250 - 350 = 900 kN The additional required frictional resistance of 900 kN from the micropile system is derived based on considering an element of soil at the micropile-soil interface and integrating the element resistance over the entire length of micropile. The vertical component of the frictional resistance at the interface opposes the applied load on the footing. The frictional resistance offered by each micropile (of 4 m length and 100 mm diameter) is obtained from the component of earth pressure parallel to the axis of the pile. The additional resistance required to be carried by micropiles is calculated and the number of micropiles are arrived at based on the contribution of each micropile. The calculations indicate that 100 mm diameter micropiles spaced 200 mm c/c provide the frictional resistance required for desired level of bearing capacity improvement. Foundation treatment consisted of driving the micropiles at an angle of 70° with the horizontal and close to the foundation as shown in Fig. 1(c). Plan and section of the structure and a schematic diagram of micropile system are shown in Figure 2. The remedial measures were implemented and the foundation has been retrofitted to the original requirements. While the solution that was suggested above was satisfactory in terms of immediate action of retrofitting, the case study also provided a good opportunity to examine the performance in terms of numerical analysis. Detailed finite element analysis has been conducted using PLAXIS to examine the above case study in terms of its overall performance.
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