摘要
为减小位于岩基上的高填方盖板涵顶竖向土压力,采用在涵顶净跨内铺设聚苯乙烯泡沫(EPS)板的方式进行减荷,并进行现场涵顶竖向土压力测试。同时,将涵顶受力比拟为倒置的条形基础受力模型,应用叠加原理,推导出净跨内减荷时涵顶净跨内和涵台顶的竖向土压力计算式。研究结果表明:与土柱压力相比,涵顶净跨内竖向土压力明显减小,而涵台顶竖向土压力明显增大,最终竖向土压力系数分别为0.46和1.44;当填方达到设计标高时,算式计算竖向土压力值为144.16kPa,填方最高段实测平均值分别为141.94,143.45,151.53 kPa,与算式计算值的相对误差分别为:-1.5%、-0.5%、5.1%;涵台顶计算所得竖向土压力变化规律亦与实测结果规律一致。
In order to reduce vertical earth pressure on the top of the high filling cover culvert on rock foundation,the expanded polystyrene board was laid in the net span on the top of the cover culvert,and the vertical earth pressure acting on the top of the culvert was tested.At the same time,the inverted strip foundation mechanical model was applied to the culvert top colculation,and using the superposition principle,the formulas for calculating vertical earth pressure were derived for the top of the culvert wall and net span with net-span load reduction.The research results showed that:compared to the soil column pressure,the vertical earth pressure on the top of the culvert with the net span load reduction decweased significantly when EPS material was laid in the net span,while vertical earth pressure on the top of the culvert wall was obviously increased,the vertical earth pressure coefficients were 0.46 and 1.44 respectively;the calculated vertical earth pressure value after filling to design elevation was 144.16 kPa,and the measured mean values of the highest filling sections were 141.94 kPa,143.45 kPa and 151.53 kPa,respectively,the relative errors between the calculated and the measured were-1.5%,-0.5%,5.1%.The variation rule of the calculated vertical earth pressure on the top of the culvert wall calculation by the theoretical formula was also consistent with the measured.
作者
曹周阳
杨凤云
魏瑞
王力
CAO Zhouyang;YANG Fengyun;WEI Rui;WANG Li(School of Civil and Architecture,Zhengzhou Institute of Aeronautical Industry Management,Zhengzhou 450015,China;Sichuan Expressway Construction&Development Corporation,Chengdu 610041,China;Sichuan Guang-Ba Highway Co.,Ltd.,Guangyuan 610015,China)
出处
《工业建筑》
CSCD
北大核心
2019年第10期129-135,共7页
Industrial Construction
基金
河南省高等学校重点科研项目(18B560015)
关键词
涵洞工程
土压力
净跨内减荷
高填方
现场试验
聚苯乙烯泡沫板
culvert engineering
vertical earth pressure
net-span load reduction
high filling
field experiment
EPS board
