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一、引言 我区引黄灌区渠沟交叉建筑物较多,许多排水沟穿过干渠时采用了涵洞型式,有作钢筋混凝土整体箱形涵洞的,有作钢筋混凝土盖板涵洞的。近年来为了节约钢材修建了许多反拱底板、予制安装钢筋混凝土半圆顶拱型涵洞。在这些结构型式中,后两种洞底系纯混凝土结构,有些在施工结束后土堤下洞身即产生横向裂缝,有的裂缝宽达数毫米,在外水压的作用下,缝内冒粉砂,犹如管涌一样。而且这些裂缝因处于水下,缝中又冒出承压水,处理很困难,若不进行处理,历时久了,地基土壤发生变形,对洞身带来很大的危害。
I. INTRODUCTION There are many ditches and ditches crossing the Yellow River irrigated area in our district. Many ditches adopt the culvert type when they pass through the main canal. There are culverts with box-shaped culverts of reinforced concrete, and culverts with reinforced concrete covers. In recent years in order to save steel built a lot of anti-arch floor, prefabricated installation of semi-dome reinforced concrete arch culvert. In these types of structures, the latter two kinds of cave-type pure concrete structure, some in the construction after the subterranean cave that is produced horizontal cracks, and some cracks wide of several millimeters, under the effect of external water pressure, the seam to take the sand Like a pipe. And because of these cracks in the water, the seam and the emergence of confined water, the treatment is very difficult, if not for processing, over time, the foundation soil deformation, on the hole caused great harm.