基于纵向不均匀沉降的盾构隧道渗漏水机理分析

研究目的:对于地铁盾构隧道,由于衬砌由管片拼装而成,地铁通车运营后,盾构隧道会因多种原因产生纵向不均匀沉降,导致管片接头张开量的增加,从而造成管片之间的接缝处发生渗漏水。因此,有必要对盾构隧道渗漏水机理进行分析、研究。研究结论:隧道纵向不均匀沉降在一定程度上会造成环缝的张开,进而造成弹性密封垫防水性能的减弱、引起管片之间发生渗漏水;环缝影响长度系数对环缝张开量几乎没有影响,而不同环宽、不同螺栓与混凝土的刚度比对环缝张开量均有一定影响:较大的环宽和螺栓与混凝土的刚度比不利于管片接缝的防水。本项研究可为隧道防水设计及运营阶段的维护等提供参考。

Analysis of Mechanism of Water Leakage Induced by Longitudinal Uneven Settlement of Shield Tunnel

Research purposes:As the lining of the metro shield tunnel is commonly assembled of the jointed segmental precast concretes,during the operation of the subway,the longitudinal uneven settlements will happen due to various factors,resulting in enlarging the joint opening of the adjacent segments to cause water leaking between adjacent segments.It is necessary to analyze and research the mechanism of the water leakage of the shield tunnel. Research conclusions:The longitudinal uneven settlement of the tunnel will make opening of the circumferential seam and weaken the property of the water resistance of the elastic gasket,resulting in water leaking between segments.The long coefficient influenced by the circumferential joints produces little impact on circumferential seam while the stiffness ratio of the different circumferential width and different bolts with the concrete will produce a certain impact on the opening of the circumferential seam.The big stiffness ratio of the circumferential width and bolts with the concrete is not good for the waterproofing of the joint segments.This research can provide the reference to the waterproofing design and maintenance of the tunnel.