小直径钢管排桩支挡结构抗滑机理及工程应用

通过对小直径钢管排桩作为抗滑支挡结构的系统研究，提出其抗滑机理主要表现为桩土复合结构“类抗滑桩”作用，破坏模式为受拉构件锚固段拔出、受压构件桩体弯剪破坏和压杆失稳等。在此基础上，给出了此类支挡结构设计技术要点，包括钢管桩排数确定、桩间距和排间距选择、锚固深度计算、连系梁设计等。小直径钢管排桩在广巴高速公路K78+230~+400段路堤滑坡得到成功应用，确保了高速公路安全，取得了良好的社会、经济效益。

Anti-slide Mechanism and Engineering Application of Small Diameter Steel Tubular Row Piles as Supporting Structure

Through systematic study on small diameter steel tubular row piles as supporting structure, the antislide mechanism is proposed to be presented mainly as pile-soil composite structure acting as ＂analogous anti- slide piles＂, whereof the failure mode is that anchored section of tension member is pulled out, pile body of compression member is failed by bending and shearing, and compression strut is instable. On this basis, the technical details asdesign of such supporting structure are given, including definition of rows number, selection of pile spacing and row spacing, calculation of anchoring depth, and design of beams between piles. Small diameter steel tubular row piles are applied successfully at the embankment landslide along K78 ＋ 250 - ＋ 400 section of Guangyuan-Bazhong Expressway to ensure the safety and get good social and economic benefits.