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隧道开挖和地面堆载以土体不均匀沉降的形式作用于管线,使管线产生纵向应力和变形。以物理模型试验手段研究了两种荷载形式下管土相互作用的差别、接头刚度对纵向响应的影响以及隧道开挖下的管土脱开现象。通过修正Gaussian曲线拟合自由土体位移场,对实测弯矩进行归一化处理发现,隧道开挖会引起管线周围相对土体模量下降,而地面堆载则会引起土体模量相对增大。非连续接头管线通过增大转角及变形来降低最大弯矩值,改善了管线的受力状态。当土层损失比增大到一定程度以后,管线下方将出现空洞,并随着损失比的增加而逐渐扩大,最终达到稳定。
Tunnel excavation and ground heap load in the form of uneven settlement of the soil acting on the pipeline, so that the pipeline longitudinal stress and deformation. The difference of soil-soil interaction under two load forms, the influence of joint stiffness on the longitudinal response and the soil-soil detachment under tunnel excavation were studied by means of physical model test. By correcting the Gaussian curve to fit the displacement field of free soil, the measured bending moment is normalized and found that the tunnel excavation will cause the relative soil modulus decrease around the pipeline, while the ground loading will cause the relative increase of soil modulus Big. Discontinuous joints reduce the maximum bending moment by increasing the corner and deformation, and improve the stress state of the pipeline. When the soil loss ratio increases to a certain extent, there will be a hole below the pipeline, and will gradually expand as the loss ratio increases, finally stabilizing.