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-  2018 

高填方大直径钢波纹管涵减荷试验
Load reduction experimental of high fill soil large diameter corrugated steel pipe culvert

Keywords: 道路工程,高填方,钢波纹管,涵洞,垂直土压力,EPS板,减荷

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Abstract:

为了研究在钢波纹管涵顶铺设聚苯乙烯泡沫(EPS)板减小涵顶土压力及其调整土压力分布效果,依托四川广巴(广元―巴中)高速公路连接线项目路基工程,对其高填方大直径钢波纹管涵开展现场试验。在设计填方最高处的路堤下沿管涵纵向选取4个特征断面,其中1个为不减荷断面,另3个为涵顶平铺不同厚度EPS板的减荷断面,并对每个断面的特征点位进行应力应变测试,研究钢波纹管涵在减荷与否2种情况下的受力与变形随填土高度的变化规律和EPS板的减荷效果。研究结果表明:在未减荷断面,填土高度在约10 m之前的垂直土压力大于土柱压力、约10 m后小于土柱压力,最终的垂直土压力系数为0.9左右;在减荷断面,填土高度在约5 m之前垂直土压力大于土柱压力、约5 m之后小于土柱压力,最终的垂直土压力系数为0.46~0.47;钢波纹管涵两侧填土时,管涵变形表现为横向收敛、竖向拱起,随着填土高度的增加,其变形逐步调整,最终表现为横向挤胀、竖向收敛,且未减荷断面的竖向收敛略大于减荷断面,最终的收敛变形率均在??1.0%~??2.0%之间;在减荷与否2种情况下,钢波纹管涵顶垂直土压力随着填土高度的增加而增大,但增幅均逐渐减小;未减荷的钢波纹管随着填土高度的增加逐渐表现出柔性管的受力特性,而具有调节土压力的能力;在钢波纹管涵顶平铺柔性材料EPS板具有显著的减荷效果和调节土压力分布的作用;钢波纹管涵顶垂直土压力是影响其最终收敛变形的一个关键因素。
This study investigated whether the expanded polystyrene (EPS) plate laid on the top of corrugated steel culverts could reduce the earth pressure at the top of the culvert, and the law of adjustment of soil pressure distribution. Based on Sichuan Guang??Ba (Guangyuan to Bazhong) Highway subgrade project, a field test on large diameter steel corrugated pipe culvert under high fill was carried out. Four characteristic sections were selected on the longitudinal culverts at the highest embankment of design fill. One of them was an unloaded section,the other three were load reduction sections for laying different thickness flexible materials (EPS plates) on top of the culverts. Simultaneously, stress and strain tests were carried out on the characteristic points of each section. The variation of stress and deformation with the height of the fill and the reducing effect of the EPS plate were studied in the two cases, where the steel corrugated pipe culvert had reducing load and did not have reducing load. The results show that at the unloaded section, the vertical earth pressure is greater than the soil column pressure when the height of the fill is less than 10 m. Conversely, it is less than the soil column pressure when the height of the fill is greater than 10 m. The ultimate vertical soil pressure coefficient is about 0.9. At the load reduction section, the vertical earth pressure is greater than the soil column pressure when the height of the fill is less than 5 m. Conversely, it is less than the soil column pressure when the height of the fill is greater than 5 m. The ultimate vertical soil pressure coefficient is about 0.46 to ??0.47??. When the steel corrugated pipe culvert is filled on both sides of the culvert, the deformation of the pipe culvert is characterized by lateral convergence and vertical arch. The deformation gradually changes with the increase of the fill height. The deformation of the culvert finally manifested as lateral bulging

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