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将双排支护桩当作框架结构考虑,提出了新的m法理论,将坑底以上前后排桩土产生的作用在前排桩坑底以下桩后的土压力及单排桩坑底以下桩后的土压力考虑在桩的受力中。双排桩及单排桩受到的土压力为位移、排桩净距和土性指标等的函数。用室内模型试验、新的m法理论及双排桩随机有限杆单元法得出:桩顶连梁与桩的刚度比达到一定值时,再继续增加连梁刚度无意义;按照公路铁路规范确定的排桩间不相互影响的排桩净距值偏于保守。跟上部结构一样,岩土概率法的发展方向不可逆转。
Considering the double-row supporting pile as the frame structure, a new m-law is put forward. The earth pressure above the pit bottom and behind the piles beneath the bottom of the front row of piles and below the bottom of single-row piles Earth pressure after the pile is considered in the force of the pile. Earth pressure on double-row piles and single-row piles is a function of displacement, clearance of piles and soil index. Using the indoor model test, the new m-law theory and the double-row stochastic finite element method, it is concluded that when the rigidity ratio of the pile-beam to the pile reaches a certain value, it will be meaningless to continue to increase the rigidity of the connecting beam. The row piles do not affect each other between the net value of the pile is biased conservative. Like the superstructure, the direction of geotechnical probability method is irreversible.