波浪作用下含飞檐结构的新型砌块护坡面变形特征分析

Analysis of Deformation Characteristics of New Type Masonry Slope Protection Surfaces with Overhanging Corners Under Wave Action

摘要:

为研究河道边坡坡面的稳定性影响因素,在传统连锁砌块的基础上,提出增加双植生孔与飞檐结构,以增强砌块护坡的生态功能。以沭河莒县段河道护坡工程为例,分析不同防护工况下连锁式混凝土砌块护坡面的稳定性。通过PFC软件模拟砂土颗粒在植生孔中的堆积形态。结果表明:将新型砌块的开孔率设计为16%,植生孔单孔尺寸为140 mm×96 mm时,飞檐结构的设计宽度值域为3.6~4.7 cm,可有效减小植生孔中的水土流失;在砌块材料强度充足的情况下,含飞檐结构砌块护岸面的削波减浪能力大幅提升。采用ABAQUS软件进行三维实体建模分析,不同防护工况的砌块受波浪反压力情况下的应力云图及位移云图对比显示:选择碎石为护坡垫层且砌块为横向铺设时,可以增强护坡面层的整体稳定性,结合飞檐设计可以达到兼具稳定性与生态性的护坡效果。

Abstract:

To study the influencing factors of the stability of the slope surface of the river channel, on the basis of the traditional interlocking blocks, the double plan-ting holes and the eaves structure are proposed to be added to enhance the ecological function of the block slope protection. Taking the riverbank protection project of the Suhe River in Juxian County as an example, the stability of the slope surface composed of the interlocking concrete blocks under different protection conditions is analyzed. The accumulation morphology of sand particles in the planting holes is simulated by PFC software. The results show that when the opening rate of the new type of blocks is set at 16% and the single hole size of the planting holes is 140 mm×96 mm, the design width for the eave structure is 3.6 to 4.7 cm, which can effectively reduce soil and water erosion in the planting holes. Under the condition that the material strength of the blocks is sufficient, the optimized design significantly enhances the wave-breaking and wave-reducing capacity of the slope surface composed of the blocks with the eave structure. The three-dimensional solid modeling analysis is carried out using ABAQUS software. The stress cloud diagrams and displacement cloud diagrams of the blocks under the wave counter-pressure in different protection conditions are compared and analyzed, showing that by choosing crushed stone as the slope pad layer and laying the block flanges horizontally, the overall stability of the slope surface layer can be enhanced. Combined with the eave design, a stable and ecological slope protection effect can be achieved.