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一、长桩的含义在“m”法中,当基础在地面(或局部冲刷线)以下的换算深度h=ah大于某一数值时,可认为基础在地面(或局部冲刷线)处的位移与基底的支承条件无关,亦即基底地层抗力所产生的抵抗力矩对基础各截面内力的影响很小而可略去不计[1],这样,就可使基础内力的计算大为简化。h究竟多大值才可以这样考虑,要根据所要求的计算精度而定,根据计算结果的分析证明h≥4时即可,这一条件对一般常用的桩基来说皆可满足。这种桩实际上可近似地认为与无限长桩一样。因此,可称之为
The meaning of long piles In the “m” method, the displacement of the foundation at the ground (or local scouring line) can be considered as the foundation depth h = ah below the ground (or local scouring line) greater than a certain value It has nothing to do with the support condition of the substrate, that is, the resistance moment caused by the formation resistance of the foundation has little influence on the internal force of each section of the foundation and can be neglected [1]. In this way, the calculation of the foundation internal force can be greatly simplified. h how much value can be considered in this way, according to the required calculation accuracy, according to the analysis of the calculated results prove that h ≥ 4 can be, this condition for the commonly used pile foundation are satisfied. Such piles can in fact be approximated as infinite piles. Therefore, it can be called