关键词: 复合式衬砌隧道, 防排水, 防水层, 防水混凝土, 排水量, 水压力

Abstract: At present ,the water leakage of composte linning tunnel is still one of the major challenges in underground at home and abroad, if designing scheme and parameters of tunnel is not reasonably choosen, it will bring many problems such as waterproofing system malfunction ,drainage system blocked , concrete cracking and water leakage and subgrade mud pumping, it also leads to massive increase in remidition and maintenance costs during operation period.In order to prevent and reduce water leakage diseases of tunnel ,the paper mainly analyses its current situation and exsiting problems of waterproofing and drainage of composte linning tunnel，and studies classification of allowable value of water drainage and water pressure of tunnel ,the separation of up and down waterproofing and drainage system，waterproofing capacity of surrounding rock，the inspection and evaluation methods for overall waterproofing effect of soft waterproofing layer and concrete。In the end the suggests for the system design and parameters selection of waterproofing and water drainage of composite linning tunnel are provided ,it could provide references for similar projects .

Key words: composte linning tunnel, waterproofing and drainage , waterproof layer, waterproof concret, water drainage, water pressure