论基岩滑坡的临床聚能与启程弹冲

ON THE ACCUMULATED STRAIN ENERGY CLOSE SLIDING PIANE AND THE ELASTIC BY IMPUSIVE MOTION ALONG THE INITIAL PATH OF BEDROCK S LANDSLIDE

剧动式高速滑坡是一种大量存在于自然界中的地质灾害。本文以广家崖斜坡危岩体为例,对基岩滑坡的“临床聚能”和“启程弹冲加速效应”进行了理论分析和探讨。文中详细论证了斜坡岩体滑落破坏时所具有的“启程弹冲加速效应”,并提出了二维应力状态下的启程冲速度计算公式。 启程弹冲机理,主要是锁固段岩体内聚力作用和岩体聚集赋存弹性应变能释放的反应,弹冲速度与内聚力的大小有直接关系。岩体一旦剪断破坏,弹性应变能骤然释放,岩体表现出剧烈的弹性回冲,弹性应变能便瞬间转化为岩体滑动的弹冲动能。这便从理论上对高速滑坡提出了具有实际意义的新机理。

The acu te moving landslide at high speed is a kind of the geological disasters existing a lot in the natural world.Tking the dangerousrocfc mass of the Guangjia cliff as an example, this paper has made a theoretic analysis and gone into the subject about the accumulated strain energy close by sliding plane and the accelerated effect.The authors think that the mechanism of the elastic impulsive motion on initial path is m-a inly the action of the internal cohesion of the locked path rock masses and the result of releasing the elastic strain energy accumulated in the rock masses. The quantity of the elastic impulsive motion velocity on initial path has direct relation with the value of internal cohesion. The elastic strain energy is releasedsuddenly as soon as the rock masses here are cutted and cracked. At the same time, the rock masses of the deformation will produce violent elastic impulsive motion. The elastic strain energy will be transterred to the kinetic energy of the slip masses. There is important and practical value has been given to the mechanism of the acute -moving landslids in this paper.