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进行了降雨条件下含软弱夹层黏性土坡的离心模型试验。试验主要研究了降雨条件下坡体的吸力和变形规律,重点分析了软弱夹层对坡体的影响。测量了含软弱夹层黏性土坡的位移和土坡内一点的吸力。试验结果表明由于软弱夹层的遇水软化和高渗透特性,降雨后含软弱夹层黏性土坡在软弱夹层发生滑出。降雨条件下含软弱夹层黏性土坡的变形可以分为均匀变形、错动阶段和滑坡3个阶段。对降雨过程中的吸力变化与坡体应变变化进行了分析,表明可以通过坡体中各点应变的发展反推出降雨入渗时刻和分布。软弱夹层的存在造成了降雨入渗分布的变化,导致了坡体错动带在该处不再连续,并降低了边坡的稳定性。
Centrifuge model tests of clay sandy soil with weak intercalations under rainfall were carried out. The experiment mainly studied the law of suction and deformation of the slope under the condition of rainfall, and analyzed the influence of the weak interlayer on the slope. The displacements of cohesive soil slopes with weak intercalation and a little suction in soil slope were measured. The experimental results show that due to the water softening and high permeability characteristics of the soft interlayer, the weak clay interlayer slips in the weak interlayer after rainfall. Under the condition of rainfall, the deformation of the clayey soil slope with weak interlayer can be divided into three stages of uniform deformation, dislocation and landslide. The change of suction and the change of slope strain during rainfall are analyzed, which shows that the time and distribution of rainfall infiltration can be deduced through the development of strain at each point in slope. The presence of the weak interlayer caused the variation of rainfall infiltration distribution, which led to the discontinuity of the slipband in the slope and the decrease of slope stability.