偏转角度对滑坡-碎屑流运动影响的模型试验

发布时间：2018-05-30 09:27

本文选题：滑坡-碎屑流 + 偏转角度　；参考：《山地学报》2017年03期

【摘要】：本文基于模型试验,对不同偏转角度(θ)作用下的碎屑流运动堆积特征进行初步研究。试验结果表明,在偏转作用下,碎屑流的运动经历了加速、持速和减速三个阶段。碎屑流的前缘速度在持速阶段表现出明显的波动性,偏转角度越大,碎屑流前缘速度波的动性越显著;但偏转角度对碎屑流的运动时间的影响并不显著。对碎屑流受偏转作用后的水平运动距离进行分析表明较小的偏转角度更有利于碎屑流的运动。偏转作用下碎屑流的堆积过程表现出"多次叠加堆积"特征,偏转角度越大"多次叠加堆积"的现象越明显。同时,碎屑流的堆积厚度分布也明显受控于偏转角度的影响。横断面上,堆积厚度沿受冲击碰撞一侧向对侧减小,两侧堆积厚度的差异随偏转角度的增大呈抛物线变化,θ=20°时最大。纵断面上,碎屑流在坡脚附近的堆积厚度随偏转角度的增大而增大。
[Abstract]:Based on the model tests, the characteristics of debris flow movement and accumulation under different deflection angles (胃) are studied in this paper. The experimental results show that the movement of the debris flow goes through three stages: acceleration, holding speed and deceleration under the action of deflection. The velocity of the front edge of the debris flow shows obvious fluctuation at the stage of holding velocity. The larger the angle of deflection, the more dynamic the velocity wave at the front edge of the debris flow, but the effect of the deflection angle on the moving time of the debris flow is not significant. The analysis of the horizontal movement distance after the detrital flow is deflected shows that the smaller deflection angle is more favorable to the movement of the debris flow. The accumulation process of detrital flow under deflection shows the characteristics of "multiple stacking", and the phenomenon of "multiple stacking" is more obvious with the increase of deflection angle. At the same time, the thickness distribution of clastic flow is obviously controlled by the influence of deflection angle. On the cross section, the stacking thickness decreases to the opposite side along the impact side, and the difference of the stacking thickness between the two sides varies parabola with the increase of deflection angle, and the maximum is at 胃 ~ (20 掳). On the longitudinal section, the accumulation thickness of debris flow near the foot of the slope increases with the increase of deflection angle.
【作者单位】：西南科技大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(41272297) 四川省科技厅项目(2014JY0121) 四川省教育厅重点项目(14ZA0095)~~
【分类号】：P642.22

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