碎石土斜坡水平受荷桩承载特性研究

Research on response of laterally loaded pile in gravel soil sloping ground

斜坡上的桩基础的承载性能是复杂多变的。对于四川西部山地地形较广泛,且地基覆盖层多为特有的碎石土地层来说,水平受荷桩的相关研究还较少。为了研究碎石土地基斜坡上单桩基础的水平承载特性及桩土间的相互作用,通过现场水平静载荷试验在坡度为0°、15°、30°、45°的条件下,探讨桩身变形、桩身弯矩、土压力的变化。运用FLAC3D有限元分析软件得出水平荷载作用下,碎石土斜坡不同坡度的桩基础与桩周土之间的应力云图、位移云图的变化特点。将数值模拟结果与现场试验结果进行了对比,提出了单桩水平临界荷载和极限荷载在不同坡度区间内取值时的折减系数,为实际工程提供一定的参考。

The behavior of a laterally loaded pile is sophisticated and diverse when it is loaded on the sloping ground. For the gravel soil as a typical strata of western Sichuan province of China, very limited research works have been carry out to study laterally loaded piles in gravel soil ground. In order to study the horizontal load-bearing characteristics and the interaction between pile and soil of the single pile embedded in the gravel soil slopes, a field test is conducted to investigate the single pile response varying gravel soil slope gradient. Slopes with gradient 0°, 15°, 30° and 45° are chosen, and the study includes pile deflection, bending moment, and earth pressure. The finite element analysis software FLAC3 D is used to obtain the pile-soil stress field nephogram and displacement field nephogram for different gradient slopes. Furthermore, comparing field test results with numerical simulation results of critical load and ultimate load of pile in different slope ranges provides a reduction coefficient for the existing methods proposed in design. In summary, the study in this paper provides a reference for future practical engineering applications.