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工程中经常遇到边坡中含有夹层的情况,对含夹层边坡的稳定性研究很有意义。目前的研究多着重于含夹层岩质边坡的稳定性,对土质边坡涉及较少,尚无系统的试验分析。开挖条件下含夹层土质边坡更容易发生破坏,对其破坏模式的正确认知有助于对其稳定性进行合理的安全评价。进行了含水平砂土夹层边坡开挖的离心模型试验,夹层位于边坡中部。通过与边界和试验条件相同的素土边坡进行对比,分析了中部夹砂层边坡开挖后的破坏模式。试验结果表明,中部砂土夹层的存在降低了边坡在开挖后的稳定性,且其下边界是边坡破坏的薄弱控制面。
It is often meaningful to study the stability of slopes with mezzanine in engineering. The current researches mostly focus on the stability of rocky slope with intercalated layers, and involve less on soil slope. There is no systematic experimental analysis. Excavation conditions with sandy soils containing dissection is more likely to damage, and its correct understanding of the failure mode help to make a reasonable safety assessment of its stability. Centrifugal model tests were carried out to excavate the slope with horizontal sand interlayer, and the interlayer was located in the middle of the slope. By comparing with the same plain soil slope with the same boundary conditions and test conditions, the failure mode of the middle sand-covered slope after excavation is analyzed. The test results show that the existence of sand interlayer reduces the stability of the slope after excavation, and the lower boundary is the weak control plane of slope failure.