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受曲率半径、地层条件等影响,顶管顶进时管道受力变形并不均匀,现有成果主要针对单节管道及接头的力学特性,对顶进过程中管路整体的力学行为研究尚显不足。采用两节1∶1比例的钢筋混凝土管进行原型试验,试验选取直线及曲线顶进两种典型工况,逐级加载到最大顶力后再逐级卸载,监测加卸载过程中两节顶管内外壁的应变值及管道接头间距。试验结果表明直线顶进时,管道轴向应变呈左右对称分布,相比曲线顶进时应变集中的趋势有所缓和。两种工况下管间接头处的钢套筒都起到了分担轴力的作用。传力衬垫受力变形特性影响顶力沿管路的传递,并最终影响管路整体的变形模式。
Affected by the radius of curvature and formation conditions, the stress and deformation of the pipe are not uniform when the pipe jacking is advanced. The existing achievements mainly focus on the mechanical characteristics of the pipe and joint. The study on the mechanical behavior of the pipe as a whole is still significant insufficient. Using two 1: 1 ratio of reinforced concrete pipe prototype test, the test selected straight line and curve jacking two typical conditions, step by step to the maximum jacking force and then gradually unloading, loading and unloading process monitoring two jacking within External wall strain and pipe joint spacing. The test results show that when the straight line is advanced, the axial strain of the pipe is left-right symmetrical distribution, and the trend of strain concentration is alleviated compared with that when the curve is advanced. Under both conditions, the steel sleeve at the joint between the pipes played a role of sharing axial force. Force transmission liner deformation characteristics affect the top force along the pipeline transfer, and ultimately affect the overall pipeline deformation mode.