摘要
在原有涵洞-填土-地基共同作用机理基础上,提出一种新型盖板涵模型,并在此模型基础上分析了采用土工格栅加筋减载的机理。通过理论分析建立了这种新型加筋减载涵洞的力学计算模型,推导了格栅加筋减载作用下涵洞顶部土压力的计算表达式。并且将理论计算得出的涵顶土压力值与有限元计算结果和现场实测结果进行了对比分析。结果表明:有减载块的加筋减载模型的理论值与有限元值结果比较接近、误差在10%以内,与无减载块的加筋现场试验结果在趋势上具有较好的一致性,并且有减载块比无减载块的模型具有更好的减载效果,表明了理论计算结果的正确性,可为工程实践提供理论参考。
Based on the collaborative working mechanism of the original culvert-filling-foundation, a modified slab culvert model is put forward based on which the load reduction mechanism of the culvert model reinforced by geogrid is analyzed. Mechanical model of the modified culvert with reinforcement is established through theoretical analysis, and the expression of earth pressure acting on the top of the culvert reinforced by geogrid is derived theoretically. Compare the theoretical calculating results on the top of the culvert with those by finite element methods and the field test results are recorded in literatures. It turns out that the theoretical results of the culvert with load reduction block are in good agreement with those by finite element methods, the error is within 10%, and the results have good consistency on the trend with those by the culvert without the block in the field test, but the culvert model with a block has a better load reduction effect than the model without one, which indicates the validity of the theoretical calculating results and can provide theoretical reference for engineering practice.
出处
《公路》
北大核心
2016年第2期49-54,共6页
Highway
基金
国家自然科学基金项目
项目编号51108434
中央高校基本科研业务费专项资金项目
项目编号CUG130408
关键词
道路工程
新型盖板涵
高填方
加筋减载
减载块
涵顶土压力
road engineering
modified slab culvert
high fill
load reduction by reinforcement
load reduction block
vertical earth pressure