摘要
通过现场试验,在盖板涵的顶部与侧面分别铺设不同厚度的EPS板进行减荷,结果表明EPS板能够显著减小涵顶与涵侧的土压力,试验测得涵顶土压力为土柱压力的0.29～0.45倍,涵侧土压力为土柱压力的0.15～0.18倍;这也表明通过铺设EPS板使得高填方涵洞上方土体应力重分布,涵顶土体存在明显的土拱效应,由于涵顶土压力在上部填土增加的过程中仍缓慢增大,说明此时的土拱效应具有不稳定的特点;当铺设EPS板后,建议采用太沙基(Terza-ghi)的土拱效应公式来计算涵顶土压力,并与试验结果进行了对比分析,得到较好的验证;并通过有限元建模,对比分析,同时也验证了减荷效果。
Through on-site testing,a new load reduction site test using different thickness EPS board on the top and lateral of culvert was done. The results showed that EPS board could significantly reduce earth pressure on the top and lateral of culvert;Test measured earth pressure on the top of culvert was 0. 29-0. 45 times of the soil column pressure, the lateral earth pressure of culvert was 0. 15-0. 18 times of the soil column pressure, which also indicated reducing-load measure made the stress redistribution on the top of culvert. The soil arching effect obviously existed because earth pressure on the top of culvert slowly increased with height increase of fill-soil, the soil arching effect has the characteristics of instability. Through finite element modeling and comparative analysis, reducing-load effects had also verified.
出处
《南水北调与水利科技》
CAS
CSCD
2010年第2期38-42,52,共6页
South-to-North Water Transfers and Water Science & Technology
关键词
高填土
涵洞
土压力
EPS板
减荷
土拱效应
有限元
high-fill soil
culvert
earth pressure
EPS board
reducing-load
soil arching effect
finite element
