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针对内蒙古黄土泥岩接触地带界面滑坡的工程地质灾害,设计锚杆挡土墙式工程防护比尺模型试验。通过监测界面处、黄土层内不同监测点的孔隙水压力、土压力、坡面标记点位移等数据,总结黄土层内土压力场、渗流场以及坡面位移的变化规律,分析黄土泥岩界面滑移诱因及滑移机制。进而对锚杆挡土墙墙后土压力和墙体位移的变化进行监测,并以锚杆挡土墙墙体位移量来评价工程防护的效果,试验结果表明在经历了2个降雨周期后,锚杆挡土墙墙体平均位移量为5.45 mm,远小于规范中要求的挡土墙失效位移。锚杆挡土墙可以防止黄土层在坡脚处的滑移趋势,抑制黄土层内裂隙的发展,减缓界面处的位移发展,阻止并防护黄土泥岩界面滑坡的出现,是黄土泥岩界面滑坡有效且可靠的工程防护形式。
Aiming at the engineering geological disasters caused by the landslide in the contact zone of loess mudstone in Inner Mongolia, the model test of protection scale of bolt retaining wall is designed. By monitoring the pore water pressure, the earth pressure and the displacement of the marker points on the loess ground, the variation rules of the earth pressure field, the seepage field and the slope displacement are summarized, and the interface slip between the loess and mudstone is analyzed Inducement and slip mechanism. Then the change of earth pressure and wall displacement after the retaining wall of the anchor is monitored, and the effect of engineering protection is evaluated by the displacement of the wall of the anchor retaining wall. The test results show that after two rainfall cycles, The average displacement of the wall of the anchor retaining wall is 5.45 mm, far less than the failure displacement of the retaining wall required by the code. Anchor retaining wall can prevent the slip of loess layer at the foot of slope, inhibit the development of cracks in the loess layer, slow down the development of displacement at the interface, prevent and prevent the appearance of landslides at the interface of loess and mudstone, Reliable engineering protection form.