加筋地基承载力特性及破坏模式的试验研究

Bearing capacity behaviours and failure modes of reinforced grounds

利用自制的模型试验设备,做了一系列加筋地基的模型试验,应用数字照相变形量测技术,结合地基土压力和基础的沉降的量测来研究加筋地基的加筋机理和变形破坏模式。基础荷载作用下的地基变形场用连续的数码相片记录,然后用数字照相变形量测技术分析得到地基的增量变形场和地基的破坏面。试验结果表明,无加筋地基的破坏模式和经典的地基破坏模式吻合较好,加筋地基的破坏模式会因为加筋体的存在而发生一定程度的改变。文中模型试验所揭示的加筋地基的变形破坏机理可作为加筋地基的极限分析的基础。

A series of model tests for reinforced ground were conducted by use of the self-designed model test apparatus, in which the digital photogrammetry for deformation measurement （DPDM） technique was employed and the earth pressure and the footing settlement were measured as well, to investigate the reinforcing mechanism and failure modes of geosynthetic reinforced grounds. Sequential images of the deformation field under a model footing were digitally recorded. The DPDM technique was used to achieve the incremental displacement field and the slip failure surface. It was revealed that the failure surface of non-reinforced ground retained some of the characteristic features of a classical bearing capacity mode of failure, but the reinforcement modified the mechanism to some extent. The mechanism of deformation identified in the tests would constitute a basis for the limit analysis of reinforced grounds.