دانلود رایگان مقاله انگلیسی رفتار حرکتی غلتشی ریزش سنگ در شیب ملایم: یک رویکرد آزمایشی - اشپرینگر 2017

Abstract:

The effects of slope surface material, slope gradient, block shape, and block mass conditions on rockfall rolling velocity were estimated with orthogonal test approach. Visual analysis shows that the importance of the factors is slope surface material > slope gradient > block shape > block mass. All the factors except block mass have the F value greater than the critical value, suggesting that these three factors are the key factors affecting the rockfall rolling velocity. Factor interaction analysis shows that the effect of the slope gradient relies largely on the slope surface conditions, and the block shape has little influence if the slope gradient is larger than a critical value. An empirical model considering the three key factors is proposed to estimate the rolling velocity, of which the error is limited to 5% of the testing value. This model is validated by 73 field tests, and the prediction shows excellent correlation with the site test. Thus, this analysis can be used as a tool in the rockfall behavior analysis.

6 Conclusions

The influences of the slope surface material, block shape, slope gradient and block mass on the rockfall rolling motion were analyzed using the orthogonal test method in laboratory. The results showed that the slope surface material, block shape, and slope gradient had significant effects on the rolling motion. The importance of the factors was slope surface material > slope gradient > block shape > block mass. The effect of the slope gradient on the rockfall rolling velocity relied largely on the slope surface condition. The block shape form has little effect on the rockfall rolling velocity when the slope gradient was larger than the critical value. Based on the testing data in the laboratory, a rolling velocity model of the rockfall was proposed.