过水堆石围堰下游边坡护坡铅丝笼稳定性研究

Stability of Protection Gabion on Downstream Slope of Overflow Rockfill Cofferdam

本文从护坡块体的一般运动方程出发,研究堆石过水围堰护坡铅丝笼的稳定性,从理论上解决护坡块体的失稳方式,从而使失稳方式的假定更接近工程实际。文中第一次提出护坡铅丝笼“绝对稳定”和“准稳定”概念,并通过研究过水围堰护坡铅丝笼稳定和失稳的运动过程,确定出绝对稳定条件和准稳定条件。经分析后认为,工程实践中过水围堰护坡块体的稳定一般为准稳定,工程设计均应采用准稳定设计;护坡铅丝笼的稳定,不仅对铅丝笼厚度提出要求,而且应对铅丝笼长度、笼间间隙等有严格要求。本文导出的公式也适用于混凝土面板块体等护坡的计算,并编制有通用程序。

Based on general motion equation of slope revetment block, the paper studies the stability of slope protection gabion of overflow rockfill cofferdam and reveals theoretically the out of stability behaviour of that, so that the out of stability behaviour hypothesis ap- proximates to actual structure conditions. The conception 'absolute stability' and 'quasi- stability' of slope protection gabion are first put forward, and the absolute and quasi-stability conditions are determined by studying motion processes for stability and out of that of slope protection gabion for overflow cofferdam. it is recognized that the stability of slope revetment block on overflow cofferdam is generally the quasi-stability, so for engineering design the quasi-stability hypothesis must be used. For stability of gabion, the requirement is set not on- ly for gabion thickness, but there are also strict demands for its length and clearance from other one. The derived formulas in the paper is also suitable for estimating slope revetment of concrete deck block, and the universal programme is worked out.