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采用无纺布作为防水层中的垫层,是国内外隧道工程中结构外层防水常用的措施,但对于无纺布如何改善隧道衬砌背后水压力分布及结构应力分布却一直缺乏相应研究。依托厦门翔安海底隧道,对不同防排水方式(即全封堵、堵排结合及排放方式)的隧道衬砌无纺布作用进行研究,采用相似模型试验方法,模型试验的比例尺为1:38.88,试验台架可同时施加土压力和水压力。通过模型试验得出结论:无论在全封堵条件还是限排条件下,无纺布均起到很好的集水、附水的作用,加强了水在衬砌四周的流动性、相互补给性,使衬砌周围的水压分布更为均匀,并且改善了衬砌结构周边的应力环境。
The use of non-woven fabric as a cushion in the waterproof layer is a commonly used measure to waterproof the outer layer of the structure in tunnel engineering at home and abroad. However, there is a lack of research on how to improve the distribution of water pressure behind the tunnel lining and the structural stress distribution. Based on the Xiamen Xiang’an Subsea Tunnel, the effect of different drainage and drainage methods (ie full sealing, blocking and discharging combination) on tunnel lining was studied. The similar model test method was used. The scale of the model test was 1: 38.88, The test bench can apply earth pressure and water pressure at the same time. Through the model test, it is concluded that the non-woven fabric plays a very good catchment and water-holding role both in the full sealing condition and in the limiting condition, and enhances the fluidity and mutual replenishment of water around the lining, So that the pressure distribution around the lining more uniform, and improve the lining of the surrounding stress environment.