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如何将抗滑结构折算为二维模型,是二维离散元模拟边坡加固计算的首要问题。针对抗滑桩,根据“弹性桩”的位移和内力计算公式,通过推导变换,得出桩身位移xy、转角?y与EI呈负相关,与桩身受力大小正相关;桩身任意点处的弯矩和剪力与EI无关,只与桩身受力大小正相关。该规律在“刚性桩”条件下进行推理同样成立。利用这一规律,将间距为d的抗滑桩EI折算为实际的1/d,进行二维计算,能得到与实际相同的桩身位移和转角;二维计算的桩身应力值乘以d,得到实际的桩身应力值。对EI折算的不同折算组合进行模拟验证,结果表明,E或I各单独折算或EI均进行折算,能得到相同的桩身应力和变形。最后,对张石高速公路类土质边坡抗滑桩进行实例计算,折算后的抗滑桩能够计算出与实际规律相符的桩身应力和应变。
How to convert the anti-slide structure into a two-dimensional model is the most important issue for two-dimensional discrete element simulation of slope reinforcement calculation. According to the formula of displacement and internal force of “elastic pile ”, the displacement of pile body xy and the angle? Y are negatively correlated with EI and derive from the force of pile body by deducing the transformation. For pile body The moment and shear force at any point are independent of EI and only positively correlated with the force of pile. This rule is also validated under “rigid pile ” conditions. Using this rule, the displacement of the pile body and the rotation angle can be obtained by converting the EI of the anti-slide pile with the distance d into the actual 1 / d and carrying out the two-dimensional calculation. The two-dimensional calculated pile stress value is multiplied by d , Get the actual pile stress value. The simulation of the different conversion combinations of EI conversion shows that E or I can be converted separately or EI can get the same pile stress and deformation. Finally, an example is given to calculate the anti-slide piles on the soil slope of Zhangshi expressway. The calculated anti-slide piles can calculate the stress and strain of the pile corresponding to the actual law.