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基于室内盾构模拟试验,研究管隧垂直、斜交和平行工况下盾构开挖对管线变形的影响。以合肥在建地铁为工程背景,主要对管线的沉降、变形和相对转角等规律进行模拟试验研究。研究结果表明,二次扰动更容易使土体产生沉降,对土体中的地下管线的位移影响更大;隧道在开挖过程中沿隧道轴向的管线变形与沿隧道环向的影响范围不同,隧道开挖对地下管线产生的环向变形影响大于轴向变形影响;隧道开挖使管线下方土压力发生变化,中间段管线下方产生荷载临空区域,土压力逐渐减小,两边缘端产生附加应力逐渐增大。研究成果可为盾构施工对地下管线变形影响的预测提供相应的控制破坏依据。
Based on the indoor shield simulation test, the influence of shield excavation on pipeline deformation under vertical, oblique and parallel tunneling conditions is studied. Taking the subway under construction in Hefei as the engineering background, the simulation experiments of the settlement, deformation and relative rotation of pipeline are carried out. The results show that secondary disturbance is more likely to cause soil subsidence, which has a greater impact on the displacement of underground pipelines in the soil. The pipeline deformation along the tunnel axial direction during excavation is different from the influence along the tunnel circumferential direction Tunnel excavation has more influence on the circumferential deformation caused by underground pipelines than axial deformation. Tunnel excavation causes the earth pressure under the pipeline to change. There is a load-carrying area under the pipeline in the middle section, and the earth pressure gradually decreases. Additional stress gradually increased. The research results can provide the basis for the corresponding control and damage for the prediction of the influence of shield construction on the deformation of underground pipeline.