论文部分内容阅读
为了研究高填方涵洞顶部土压力随填土高度变化的规律以及拱效应,依据相似原理设计了宽坦沟谷沟心设涵边界条件的涵洞室内模型试验,测得不同填土高的涵洞顶部土压力和涵台外侧土压力;选取图们—珲春高速公路桩号为RK392+640处高填方涵洞作为试验涵洞,在涵顶埋设土压力盒测量不同填土高度的涵顶竖向土压力;按照《公路桥涵设计通用规范(JTG D60-2004)》计算土压力,比较并分析计算值与实测值的误差。结果表明,涵顶土压力随着填土的增加而增加,当填土达到一定高度后,高填方涵洞上方将产生拱效应,由于涵顶路基填料的特点,拱效应具有不稳定性,从而使土压力的增加幅度变小,涵顶土压力也随填土高度呈现非线性规律变化。
In order to study the law of earth pressure at the top of high culvert with the change of filling height and the arch effect, the culvert indoor model test was designed according to the similarity principle, Pressure and the earth pressure outside the culvert; selecting the high-fill culvert of RK392 + 640 as the test culvert for the Tumen-Hunchun Expressway, measuring the vertical earth pressure of the culvert at different fill levels at the culvert top; Calculate earth pressure according to “Code for Design of Highway Bridges and Culverts” (JTG D60-2004), and compare and analyze the errors between calculated and measured values. The results show that the pressure on the culvert increases with the increase of filling. When the filling reaches a certain height, the arch effect will occur above the culvert culvert. Due to the characteristics of the culvert filling, the arch effect is unstable The increase of soil pressure becomes smaller and the pressure of culvert roof also changes nonlinearly with the filling height.