%0 Journal Article
%T 岩质边坡滚石飞落模型与防治技术<br>Free-fly rolling model of stone on rock slope and control techniques
%A 崔
%A ？？
%A 石永飞
%A 孟家琪
%J 长安大学学报(自然科学版)
%D 2018
%X 针对公路岩质边坡的滚石灾害问题，建立岩石跳跃滚落的理论分析模型，推导了岩石运动的轨迹方程、滚石第1次落点后的水平速度和竖向速度以及第2次落点的水平距离，计算了滚石掉入构筑物表面的水平距离和对砂垫层的撞击能，并计算了滚石撞入砂垫层的入土深度，分析了撞击能与入土深度的关系，同时推导出了滚石落入砂垫层的冲击压力、最大法向压应力、撞击能以及压入量，并通过2个算例对提出的模型进行验证，根据计算结果选取了合理的防护方式对滚石灾害进行防护。研究结果表明：算例1滚石对砂垫层的压入量为1.28 m，设计构筑物上的砂垫层厚度为2 m，同时考虑到构筑物的安全储备，滚石撞击坡面后的水平运动距离小于撞击点到公路路缘的水平距离，滚石飞落至地面的撞击能为167 kJ，采用型号为AXI-015（防护等级为200 kJ）的被动防护网可有效防护构筑物，避免安全事故的发生；算例2滚石落入砂垫层的压入量为0.87 m，撞击能为124 kJ，设计洞口顶回填1.5 m厚的砂垫层，采用防护等级为150 kJ的被动防护网可有效防护边坡滚石灾害。采用提出的模型计算并进行防护的效果非常明显，证明了所建模型的可实施性,为以后类似工程提供了有益指导。<br>Aiming the problem of rolling stone disasters of highway rock slopes, a theoretical analysis model of rock jumping and rolling was established. By deducing the trajectory equation of rock movement, the horizontal velocity and vertical velocity of the first drop point of rolling stone and the horizontal distance of the second drop point were derived. In addition, the horizontal distance of rolling stone falling into the structure surface and the impact energy on sand cushion were calculated, the depth of rock rolling into sand cushion was calculated, and the relationship between impact energy and depth was analyzed. At the same time, the impact pressure, the maximum normal compressive stress, the impact energy and the amount of indentation of rolling stone falling into sand cushion were derived. The proposed model was verified by two examples. According to the calculation results, a reasonable protection method was selected for the protection of rolling stone hazards. The results show that in the first example, the amount of indentation of rolling stone falling to sand cushion is 1.28 m, and the thickness of sand cushion on the designed structure is 2 m. Considering the safety reserve of structure, the distance of horizontal movement of rolling stone after hitting the slope is less than the horizontal distance from the impact point to road edge, and the impact energy of rolling stone flying down to the ground is 167 kJ. The passive protective net of AXI-015 (protection grade is 200 kJ) can effectively protect the structure and avoid accident. In the second example, the amount of indentation of rolling stone falling into sand cushion is 0.87 m, the impact energy is 124 kJ, and the thickness of sand cushion with 1.5 m is backfilled to the top of the designed hole. The passive protective net of AXI-015 (protection grade is 150 kJ) can effectively protect slope rolling rock hazards. The effect is obvious of which using proposed method for calculation and protection. At the same time, it is proved that the model can be implemented, which can provide
%K 道路工程
%K 岩质边坡
%K 弹性力学
%K 滚石灾害
%K 砂垫层
%K 防护网&lt
%K br&gt
%K road engineering
%K rock slope
%K elastic mechanics
%K rolling disaster
%K sand cushion
%K protective net
%U http://zzszrb.chd.edu.cn/oa/DArticle.aspx?type=view&id=201703056