颗粒流重力增加法的改进研究

Research on Improved Grain Flow Gravity Increase Method

针对土坡安全系数数值分析中运用颗粒流重力增加法计算结果偏大的问题,对颗粒流重力增加法进行了改进,即通过降低颗粒摩擦系数,抵消土体抗剪强度因重力增加而提高的不利影响,使计算出的土坡安全系数更加合理。计算结果表明,采用改进的重力增加法计算的土坡安全系数与其他方法计算结果相近;同时结合模型颗粒间的接触和作用力的变化,可以准确确定粘性土坡的滑动面。可见改进的重力增加法有效改善了重力增加法的不足,在计算粘性土坡的安全系数中具有一定的参考价值。

Aiming at the problem that the safety factor of earth slope obtained by grain flow gravity increase method is unreasonably large,the grain flow gravity increase method is improved.By reducing the particle friction coefficient,the adverse impact of soil shear strength is offset which caused by gravity increasing.Therefore,it makes the slope safety factor more reasonable.The results show that the slope safety factor obtained by improved gravity increase method is close to other methods;the sliding surface of cohesive soil slope can be determined accurately by taking the change of contact and force between particles into consideration.It is indicated that modified gravity increase method improves the lack of gravity increase method effectively and has certain reference value in the calculation of safety factor for cohesive soil slope.