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以江西省景德镇某地区基坑开挖为案例,定量分析了四种不同的开挖方式对二元结构边坡稳定性的影响。通过建立基坑开挖模型,模拟了一步开挖、分步开挖、整体跳挖和分步跳挖四种开挖方式,在对基坑斜面不同部位实时监测的基础上,定量分析得出基坑开挖导致应力重分布,在基坑斜面底部因剪应力较大容易产生破坏,采用分段跳挖的方式有助于保持基坑的稳定性,采用分层开挖的方式有助于减小基坑底部隆起量。建立的模型能够较为准确的模拟不同工况下基坑开挖对边坡稳定性影响,可以较好地对比出开挖方式对于维持边坡稳定性的优劣性,具有很好的借鉴意义。
Taking the excavation of a foundation pit in a certain area of Jingdezhen, Jiangxi Province as a case, the effects of four different excavation methods on the stability of the binary structure slope are quantitatively analyzed. Based on the excavation model of foundation pit, four kinds of excavation methods such as one-step excavation, step excavation, overall excavation and step-by-step excavation are simulated. Based on the real-time monitoring of different parts of pit slope, the quantitative analysis Excavation of excavation leads to stress redistribution. It is easy to cause damage at the bottom of slope of foundation pit due to large shear stress. Using the method of sectional excavation helps to maintain the stability of foundation pit. The method of stratified excavation helps to Reduce the amount of foundation pit bulge. The established model can accurately simulate the influence of the excavation under different conditions on the slope stability, and can well compare the advantages and disadvantages of the excavation methods for maintaining the stability of the slope, which is of great reference significance.