泄水式管片衬砌壁后水压力分布特性模型试验研究

STUDY OF MODEL TEST FOR WATER PRESSURE DISTRIBUTION CHARACTER BEHIND DRAINAGE SEGMENT LINING

基于研制的泄水式管片衬砌–围岩泄流装置,采用室内试验方法对某铁路隧道装配式泄水式管片衬砌在高水压条件下衬砌壁后水压力分布规律进行研究,重点探讨单纯限排、堵水限排等不同泄水方案下衬砌壁后外水压力分布规律。分析排泄流量、泄水孔密度、注浆与否对隧道衬砌壁后水压力的影响,揭示隧道衬砌壁后整体和各位置处外水压力折减系数、外水压力大小等与衬砌泄水孔泄流量之间的二次曲线关系。研究结果可为高水压山岭隧道衬砌的设计提供参考。

Based on the developed drainage segment lining-surrounding rock flow system, water pressure distribution law behind prefabricated drainage segment lining of a high water pressure amnel is studied by employing indoor test as research methods. Discussion focus on water pressure distribution law behind the segment lining for different drainage schemes such as limiting discharge only, blocking groundwater-limiting discharge is conducted. Meanwhile, an attempted analysis for the effect of discharge capacity, grouting circle and discharge outlet density on water pressure behind the lining is carried out, so as to reveal the conic relationships of external water pressure discount coefficient or external water pressure and flow discharge for the whole lining and different parts of the lining. The study results can provide a reference for the design of high water pressure tunnel lining.