岩石高边坡加固中抗滑桩-内支撑联合支护的数值模拟研究

Numerical simulation study on anti-slide pile-internal support composite structure in the reinforcement of high rock slope

为解决岩石高边坡因放坡条件受限导致加固措施难以满足工程应用这一现实问题,提出了抗滑桩-内支撑联合支护体系。基于有限差分软件FLAC3D,对贵州某岩石高边坡施行了抗滑桩-内支撑联合支护,并进行了三维数值模拟计算,分析了边坡从开挖到支护完毕全过程中的坡体位移、桩身弯矩、剪力、桩身位移以及安全系数的变化规律,研究了抗滑桩在内支撑作用下的受力变形特性和边坡支护效果。研究表明:抗滑桩联合内支撑结构能有效地控制坡体变形,提高了边坡施工过程中的安全系数,增加了边坡的整体稳定性;内支撑的施加将两侧的抗滑桩连成一个整体,使得双侧桩共同受力、协调变形,改善了桩身的变形和受力状态,极大地提高了抗滑桩的承载性能。研究结果可为此类岩石高边坡的支护治理提供理论借鉴。

In order to solve the current problem that the reinforcement measures of the high rock slope are difficult to meet the engineering application due to the limited slope release condition,based on FLAC3D,the anti-slide piles combined internal support was performed on a high rock slope in Guizhou and threedimensional numerical simulation calculations were performed.The changes of slope displacement,pile bending moment,shear force,pile displacement and slope safety factor during the whole process from excavation to support were analyzed.The stress and deformation characteristics of anti-slide piles with inner support and the effect of slope support were studied.The results showed that the anti-slide piles combined internal supporting structure could effectively control the deformation of the slope,improve the safety factor during the construction of the slope and enhance the overall stability of the slope.The application of internal support connected the anti-slide piles on both sides into a whole,so that the two-sided piles could bear the force and coordinate the deformation.It improved the deformation and stress state of the pile body,and greatly improved the bearing performance of the anti-slide pile.The research results could provide a certain theoretical reference for the support and treatment of such high rock slopes.