高填土涵洞减荷试验研究  

Experiment on Reducing-Load Measure of Culvert under High-Fill Soil

作　　者：曹周阳[1] 王晓谋[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《南水北调与水利科技》2010年第2期38-42,52,共6页South-to-North Water Transfers and Water Science & Technology

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.

关 键 词：高填土 涵洞 土压力 EPS板 减荷 土拱效应 有限元 

分 类 号：TU312[建筑科学—结构工程]