静载作用下波纹钢拱涵力学变形特性

通过填土及静载试验，选取涵洞轴线中部波谷截面、涵洞轴线中部波峰截面、涵洞洞口处波谷截面、涵洞洞口波峰截面4个钢波纹拱涵断面，布设应变片、土压力盒及变形测量仪器，对波纹钢拱涵应力-应变、位移等力学特性进行研究，得到静载作用下波纹钢拱涵的力学变形特性及变形规律。研究结果表明：1）在相同填土高度荷载作用下，波纹钢拱涵所受竖向应力相比于未设置涵洞的土体竖向应力较小，而由于涵洞结构挤压填土导致侧向土压力大于相同高度下土中应力；2）由于填土施工各阶段中涵洞所受周围土压力方向的不同，涵洞填土过程中多个位置出现拉压变化的现象，涵洞涵顶、涵腰位置处应变往往较大，故该点相对其他测点为薄弱点。

MECHANICAL DEFORMATION CHARACTERISTICS OF CORRUGATED STEEL ARCH CULVERT UNDER STATIC LOAD

Through filling and static load tests, four steel corrugated arch culvert sections are selected, including trough section in the middle of the culvert axis, peak section in the middle of the culvert axis, trough section at the culvert opening, and wave crest section at the culvert opening, and set up strain gauges, earth pressure boxes and deformation measuring instruments, the mechanical characteristics of corrugated steel arch culverts such as stress, strain and displacement are studied, and the mechanical deformation characteristics and deformation laws of corrugated steel arch culverts under static load are obtained. The research results show that:1) Under the load of the same fill height, the vertical stress of the corrugated steel arch culvert is smaller than the vertical stress of the soil without culvert. The earth pressure is greater than the stress in the soil at the same height; 2) Due to the difference in the direction of the surrounding earth pressure on the culvert in the various stages of filling construction, the phenomenon of tension and compression changes at multiple locations during the filling process of the culvert, culvert culvert, culvert waist. The strain at the location is often larger, so this point is a weak point relative to other measuring points.