浅覆土特长箱涵顶进结构受力特性数值分析

发布时间：2018-07-02 11:42

本文选题：桥梁工程 + 浅覆土特长箱涵　；参考：《公路交通科技》2017年06期

【摘要】：为了探明顶进施工中浅覆土特长箱涵顶进结构的受力特性,结合广东地区某工程实例,通过三维有限元模拟分析了不同顶进长度、覆土厚度及摩阻系数等工况条件下浅覆土特长箱涵顶进结构的应力应变变化规律及顶进施工扰动影响范围,结果表明:相同工况条件下,随着顶进长度增加浅覆土特长箱涵顶板和底板的应力与应变呈现靠椅状变化趋势,而其腹板的应力与应变则呈现倒梯形截面变化趋势;涵顶覆土厚度及其性状对浅覆土特长箱涵顶进结构的应力与应变影响较大,涵顶覆土厚度越厚土体越密实,箱涵结构所受应力与应变越大;受顶进施工影响,涵顶上覆路面的沉降量为7.0~17.1 mm,沿顶进方向路基路面受扰动影响范围为23~30 m,与采用泥浆减阻措施相比采用石蜡+机油措施的减阻效果更为有效。
[Abstract]:In order to find out the mechanical characteristics of the jacking structure of the super-long box culvert with shallow overlying soil during jacking construction, combined with an engineering example in Guangdong area, the different jacking lengths are analyzed by means of three-dimensional finite element simulation. Under the working conditions such as overburden thickness and friction coefficient, the stress-strain variation law of the jacking structure of the shallow overburden box culvert and the influence range of the jacking construction disturbance are obtained. The results show that under the same working conditions, With the increase of the jacking length, the stress and strain of the shallow overlying extra-long box culvert show the trend of chair shape change, while the stress and strain of the web plate show the trend of inverted trapezoidal section. The thickness of culvert overlying soil and its characteristics have great influence on the stress and strain of the jacking structure of extra-long box culvert with shallow overlying soil. The thicker the soil mass, the greater the stress and strain of the culvert structure, which is affected by the jacking construction. The settlement of the culvert overlying pavement is 7. 0 ~ 17. 1 mm, and the disturbance range of the subgrade and pavement along the top direction is 23 ~ 30 m. Compared with the mud drag reduction measure, the drag reduction effect of the paraffin oil is more effective.
【作者单位】：陕西理工大学土木工程与建筑学院;云南建投第四建设有限公司;
【基金】：陕西理工大学校人才启动项目(SLGQD16-11)
【分类号】：U449.82

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