典型顺层高边坡工程病害的地质力学模型试验研究

以万梁高速公路某顺层高边坡病害治理工程为背景,采用地质力学模型试验方法,完成了顺层高边坡有无支挡模型的对比试验。给出了顺层高边坡工程病害的相似物理模拟方法,采用均匀毛细浸润技术模拟雨水对模型滑带材料的影响,得到了开挖、降雨以及支挡工况下顺层高边坡工程病害的发展形态以及抗滑支挡结构的受力特点。结果表明,在无支挡条件下坡体具有牵引式加速下滑的运动特点,且坡面质点的运动速率比滑带质点大,抗滑支挡结构的施加不仅限制了坡体位移,而且使坡体呈现出了推动式的运动特点;工后降雨会引起锚索预应力的较大损失,对锚索抗滑桩中锚索而言,约为设计值的10%;对于框架锚索而言,多次降雨会直接影响到结构的长期可靠性。

Geomechanical model tests on slope hazards of typical high bedding rock slopes

Based on the reinforcement engineering of the high bedding rock slope of Wanzhou Liangping Expressway,two models,among which one was reinforced and the other was not reinforced,were compared by geomechanical model tests.A method to simulate slope hazards of high bedding rock slope was given.During the tests,the influence of rain on slopes was simulated by the uniform capillary flooding method.The variation of displacement of slopes under excavation,rainfall and reinforcement and the variation of stress in anti-slide structures were presented.It was shown that,without anti-slide structure,the sliding mass moved in an accelerating pull type and the mass points on surface moved with a larger speed than that of the points in sliding body,but the effect of anti-slide structure could not only limit the displacement of sliding mass but also make the sliding mass moving in a push type.Rain fall caused a great loss of prestress of anchor wires.As for the anchor wires in anchor cable-pile,the percentage of loss was about 10%;repeated rain fall might have a disastrous effect on the long-term reliability of the structure with regard to the anchor wires in anchor frames.