隧道排水系统非对称堵塞对衬砌外水压力的影响

基于目前未见对隧道排水系统非对称堵塞后的衬砌外水压力的变化规律的研究,以重庆中梁山某隧道为研究背景,建立了隧道及其排水系统的简化模型,通过模拟不同长度的排水系统非对称堵塞,研究了隧道衬砌结构受到的水压力的变化规律,并且在隧道工程中进行了现场模拟排水系统堵塞的试验,试验结果与数值模拟可相互印证。研究结果表明:(1) 隧道排水系统单侧堵塞后,堵塞侧二次衬砌背后的水压力在短时间内将上升,然后逐渐下降至稳定,但高于排水系统正常时的水压;(2) 隧道排水系统非对称堵塞长度不断增加时,堵塞侧二次衬砌背后受到的外水压力峰值和稳定值也不断增加;(3) 隧道排水系统非对称堵塞长度不断增加时,注浆加固圈承受的最大水压力绝对值不断在增加,但注浆加固圈分担水压力的能力将逐渐减小。

Regulation of External Water Pressure of Tunnel Lining with Asymmetric Blocked Drainage System

Regulation of external water pressure of the deep tunnel lining with asymmetric blocked drainage system has not been carried out at present. Take a deep mountain tunnel as the research background, a simplified model of tunnel and its drainage system is established. Research on regulation of external water pressure of the deep tunnel lining with different length asymmetric blocked drainage system. Simulation the asymmetric blocked drainage system test in the tunnel construction site, and the results and numerical simulation can be mutually confirmed. After drainage system asymmetric blocked, the hydraulic head will go higher in short time in blocked side, and gradually stabilized eventually. The longer drainage system asymmetric blocked, the higher the external water pressure of the tunnel lining, the weaker the ability of grouting circle sharing the water pressure.