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采用颗粒流方法的基本理论,利用基于离散单元法的二维颗粒流程序(PFC2D),建立软黏土的颗粒流模型,对软土路基填土土坡的接触应力场和位移场进行模拟,然后在该土坡模型基础上加入碎石桩,模拟碎石桩对土坡稳定的作用。该方法克服了传统的连续介质力学模型的宏观连续性假设,对比研究了碎石桩加固前后的土坡在滑动时位移场的变化,以及不同桩径、不同间距、不同桩长对土坡的加固效果。研究表明,碎石桩桩长对抗滑能力有明显的影响,随着桩长增加,碎石桩抗滑能力显著提高;不同桩径的碎石桩,抗滑能力不同,随着桩径加大,抗滑能力提高;桩间距对抗滑能力的影响,需根据桩径优化确定,发挥桩与土共同作用。
Based on the basic theory of particle flow method, particle flow model of soft clay was established by using two-dimensional particle flow program (PFC2D) based on discrete element method to simulate the contact stress field and displacement field of soft soil subgrade fill soil slope The gravel pile is added to the soil slope model to simulate the effect of the gravel pile on the stability of the slope. The method overcomes the macroscopic continuity assumption of the traditional continuum mechanics model and compares the displacement field changes before and after the gravel piles are strengthened and the influence of different pile diameters, different pitches, different pile lengths on the slope Reinforcement effect. The results show that the length of stone pile has a significant effect on the anti-skid ability. With the increase of pile length, the anti-skid capacity of the stone column significantly increases. The anti-skid capacity of the stone columns with different pile diameters is different. , Anti-skid ability; pile spacing on the anti-skidding capacity, according to optimization of pile diameter to determine, to play the role of the pile and the soil together.