泄水孔堵塞对格构锚杆支护边坡的稳定性影响研究

Study on the Influence of Drain Hole Blockage on the Stability of Frame Anchor Reinforced Slope

边坡施工或运营期间常因多种因素作用导致排水孔堵塞,从而抬升地下水位,影响边坡稳定性和支护结构的安全。采用以板代孔法模拟排水孔,重点研究了格构锚杆支护形式下排水孔不同堵塞程度后边坡地下水位变化规律、支护结构力学响应以及边坡安全系数。计算结果表明:排水孔堵塞对坡后地下水位影响显著,格构锚杆支护的边坡地下水位随堵塞程度呈线性增加,堵塞程度超过20%时,水位显著升高;锚杆轴力随堵塞程度增加近似呈线性增长,最大增长幅度达到40%;堵塞程度超过60%后,边坡安全系数显著降低。研究成果有助于指导高边坡支护形式设计的选择。

During slope construction or operation,drain holes are often blocked due to various reasons,which results on raising water table and affecting the stability of the slope and the safety of the reinforced structure.In this paper,drain hole is simulated by the plate method instead.Changing law of water table,behaviors of reinforced structure and factor of safety of slopes are studied under the form of lattice anchor rod support and the impacts of various degrees of drain-hole block.It is resulted that blockage of drain hole has a significant impact on the water table behind the slope.Water table resulted increases linearly with the ascent of blockage degree,raising significantly after blockage degree exceeding 20%.Axial force of the anchor rod increases approximately linearly with the rise of the blockage degree,and the amplitude peeks at 40%.When blockage degree exceeds 60%,factor of safety of the slope dropped dramatically.The result is a meaningful guidance of design work on high slope support.