某锚拉式桩板挡墙裂缝原因分析与治理

Analysis and Treatment of Cracking in an Anchortensioned Pile-sheet Retaining Wall

某锚拉式桩板挡墙裂缝水平起伏,与桩横截面平行,横截面处未贯通;裂缝在桩临空面较宽,向桩临土面逐渐消失,裂缝形态表现为受弯开裂。挡墙墙背因岩溶角砾岩力学性质较差、墙底超挖、锚头破坏钢筋接头连接失效等原因,桩临空面弯矩超过桩的抗弯能力,桩出现平行于横截面的水平拉裂缝。采用“新增锚索与腰梁+裂缝修补+泄水孔修复”的方式进行加固治理,效果良好,可为类似工程提供参考。

The cracks in a certain anchor-tensioned pile-sheet retaining wall exhibit horizontal fluctuations,parallel to the crosssection of the piles,and are not continuous across the cross-section.The cracks are wider on the free-face side of the piles and gradually disappear towards the soil-facing side,manifesting as bendinginduced cracking.Due to factors such as the poor mechanical properties of karst breccia at the back of the retaining wall,overexcavation at the base of the wall,and failure of the anchor head to connect the steel reinforcement joints,the bending moment on the free-face side of the piles exceeds their bending capacity,resulting in horizontal tensile cracks parallel to the cross-section.Reinforcement and treatment were carried out using a combination of"new anchor cables and waist beams+crack repair+weep hole restoration"achieving good results that can serve as a reference for similar projects.