边坡滚石灾害的作用机理与防治对策

Mechanism of action and prevention methods of slope rock fall hazard

针对山区高速公路边坡滚石灾害频发现象,探求滚石与边坡作用机理和运动特征,以仙居白鹤隧道出口端右侧边坡为背景,从现场试验出发,对不同形态的滚石进行了多组试验,并引入块体短长轴比的概念,分析建立了滚石水平运动距离与短长轴比的关系,结合滚石防护的成功例子总结了滚石防治的两种理念和三种防护手段:采取刚性和柔性防护相结合的方法,分别从滚石源头、途径和终点进行拦截。

Aiming at the frequent hazards of slope rock fall on freeway in mountain area, the authors discussed the mechanism of action of rock fall with slope. The test site is located at right slope near Baihe tunnel exit in Xianju County. A lot of rock falls in different shape were chosen for several groups of tests. A concept called ratio of short-axis to long-axis （RSL） was introduced for the tests. According to the results, a rdation between horizontal motion distance and RSL was established for rock fall. In combination with successful case for prevention from rock fall, it is summarized for two ideas and three methods, i.e. taking two ideas of flexibility protect and stiffness protect to hold up rock fall at initial point, on the midway and at end point.