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山区公路等级低,小流域沟谷产生的泥石流冲蚀凹岸路基土,造成路面坍塌,从而影响山区道路的通行.在台风暴雨作用下,对野外泥石流冲蚀路基土的力学机理研究较少.通过模拟泥石流沟,采用两种不同类型的泥石流冲刷路基,采用路基土模拟沟谷凹岸.模拟试验发现:黏性泥石流冲蚀掏空凹岸路基土的时间比稀性泥石流冲蚀掏空凹岸路基土的时间长.泥石流冲蚀路基时,总是先形成小的冲蚀槽,然后再继续扩大,进而掏空路基;采用条分法建立泥石流冲蚀路基形成小冲蚀槽的力学原理模型,根据泥石流的冲击力,通过临界状态分析确定了冲蚀形成的冲蚀槽弧长,试验结果与野外现象相一致.
Due to the low grade of mountainous road, the debris flows generated from the valley ditches the concave bank subsoil, causing the pavement to collapse, which will affect the passage of mountainous roads.Under typhoon torrential rains, Simulating the debris flow channel, two different types of debris flow were used to wash the subgrade, and the subgrade soil was used to simulate the concave groove of the valley.It was found through simulating experiments that viscous debris flow eroded the concave bank subgrade soil and eroded the concave bank subgrade When the debris flow erodes the embankment, a small eroded groove is always formed first and then further expanded to evacuate the embankment. The mechanical principle model for forming a small eroded groove by debris flow erosion embankment is established by using the strip method. According to the impact force of the debris flow, the arc length of the erosion groove formed by the erosion is determined by the critical state analysis, and the test result is consistent with the field phenomenon.