溜石坡崩塌体运动过程与防治措施研究*

为降低中巴公路沿线溜石灾害风险，以中巴公路K777桩处溜石坡为研究对象，定性分析溜石崩塌体运动特征并设计格栅挡墙防护结构。采用有限差分与离散元耦合方法对溜石灾害进行数值模拟，定量分析溜石崩塌体运动状态及公路挡墙动力冲击响应。结果表明:不同粒径下溜石平均速度变化趋势相同，溜石崩塌体运动速度与溜石粒径呈正相关，溜石在自然条件下对公路挡墙冲击集中且受力较大，通过布置格栅挡墙可降低公路挡墙受力，分散溜石冲击，有效拦截大粒径溜石，降低溜石灾害影响。在相同格栅挡墙孔径下，降速效果与溜石粒径呈负相关。可通过考察溜石坡实际情况设计格栅挡墙尺寸，降低中巴公路沿线溜石灾害风险。

Research on movement process and prevention measures of collapse mass in rock-sliding slope

In order to reduce the risk of rock-sliding disaster along the China-Pakistan Highway,taking the rock-sliding slope at the K777 pile of this highway as the research object,the movement characteristics of rock-sliding collapse body were qualitatively analyzed,and the protective structure of the grid retaining wall was designed.The finite difference and discrete element coupling methods were used to numerically simulate the rock-sliding disaster,and the movement state of the rock-sliding collapse body and the dynamic impact response of the highway retaining wall were quantitatively analyzed.The results showed that the change trends of the average speed of sliding rock with different particle sizes were the same.The movement speed of rock-sliding collapse body was positively correlated with the particle size of sliding rock,and the impact of sliding rock on the highway retaining wall was concentrated and the force was large under natural conditions.Laying the grid retaining wall could reduce the force of highway retaining wall,disperse the rock-sliding impact,effectively intercept the sliding rock with large particle size,and reduce the influence of rock-sliding disaster.Under the same aperture of the grid retaining wall,the deceleration effect was negatively correlated with the particle size of sliding rock.Therefore,the size of grid retaining wall can be designed by investigating the actual situation of rock-sliding slope to reduce the risk of rock-sliding disaster along the China-Pakistan Highway.