落石冲击力计算方法的试验研究

TEST AND RESEARCH ON CALCULATING METHOD OF FALLING STONE IMPULSIVE FORCE

为了探索明洞落石冲击后产生的附加荷载对结构物的影响，针对我国的工程实际，以若干单一化条件为基础，采用小比尺的模拟棚式明洞．通过重锤自由下落到土槽的实验方法，找出落石对具有不同厚度填土缓冲层的明洞产生冲击力的变化规律，提出了计算落石冲击力的实验式，为工程设计提供基本依据。

In order to understand the influence of the falling stone impulsive force to the gallery structure,a model test of gallery with small scale was done. In the test,the Chinese engineering realities were taken into account,and the method for a gravity hammer to fall freely onto the soil groove was adopted under the conditions of several seperated variables.As a result,the variation rule of the impulsive force produced by the falling stone on the gallery with a cushion soil layer was found out,and the experimental formula of caculating falling stone impulsive force was given. Thereby,the essential basis has been provided for the engineering design.