基于新型模型试验的桩-土体系变形演化阶段的研究

Study on deformation evolution stage of pile-soil system based on new model test

摘要

为探究因滑坡在抗滑桩加固下形成的桩土相互作用的演化模式，并建立以桩土相互作用体系的协同变形与破坏特征为标准的滑坡稳定性评价标准，采用室内试验的手段，依托既有工程案例，采用拉动式滑坡抗滑桩模型试验装置进行室内模型试验，模拟滑坡滑动时桩土相互之间的作用关系，依靠预设的监测装置分别对坡内土压力、桩身应变、桩位移、坡体宏观变形等进行监测。得到了不同阶段内滑坡渐进破坏过程中滑坡-抗滑桩体系的宏观变形特征，桩身应变变化特征，桩后土压力变化特征。以此共同作为体系演化阶段的划分依据，将小型滑坡-抗滑圆桩体系的桩土相互作用变形演化阶段划分为初始压密阶段、裂纹扩展阶段、残余屈服阶段、桩土破坏阶段。并依托坡体与抗滑桩在不同阶段的宏观变形特征，建立了较为直观的桩土相互作用演化过程中不同阶段的划分标准。

Abstract

In order to explore the evolution mode of pile-soil interaction formed by landslide under the reinforcement of anti-slide piles, and to establish a landslide stability evaluation standard based on the synergistic deformation and failure characteristics of pile-soil interaction system, the indoor model test was carried out by means of indoor test, relying on the existing engineering cases, and the model test device of pull-type landslide anti-slide pile was used to simulate the interaction between pile and soil during landslide sliding. the soil pressure, pile strain, pile displacement and macro deformation of slope were monitored by preset monitoring device. The macroscopic deformation characteristics of landslide-anti-slide pile system, the strain variation characteristics of pile body and the variation characteristics of soil pressure on pile in the process of progressive failure of landslide in different stages were obtained. Taking this as the basis for the division of the evolution stage of the system, the evolution stage of the pile-soil interaction deformation of the small landslide-anti-slide pile system was divided into: the initial compaction stage, crack propagation stage, residual yield stage and pile-soil failure stage. Based on the macroscopic deformation characteristics of the slope and the anti-slide pile at different stages, a more intuitive division standard of different stages under the evolution mode of pile-soil interaction was established.

关键词

边坡工程 / 桩土相互作用 / 试验研究 / 抗滑桩

Key words

slope engineering / pile-soil interaction / experimental study / anti-slide pile

Author summay

张晓亮(1984—), 男, 高级工程师, 学士, 主要从事工程建设与管理工作研究。E-mail: [e-mail]