？ QIU X B, LI S C, CHEN W Z. Numerical analysis of rock cover thickness of subsea tunnel [J]. Tunnel Undergr Space Technol, 2004(19): 426.
[3]
？ ZHAO Tiejun, JIN Zuquan, WANG Ming-ping. Environmental Condition and Durability of Lining Concrete in Qingdao Jiaozhou Bay Subsea Tunnel [J]. Chin J Rock Mech Eng, 2007, 26(2007–S2): 3823–3829.
[4]
？ SUN Jun. Discussion on some key technical issues for design and construction of undersea tunnels [J]. Chin J Rock Mech Eng, 2006, 25(8): 1513–1521.
[5]
？ EDVARDSEN C K, KIM Y J, PARK S J. Busan-geoje fixed link concrete durability design for the bridges and tunnels [J]. Tunnel Undergr Space Technol, 2006, 21(3/4): 432.
[6]
？ JIN Zuquan, SUN Wei, HOU Baorong, et al. Key coefficient of constructed lining concrete in Jiaozhou bay subsea tunnel [J]. J Central South Univ: Sci Technol, 2011, 42(3): 810–816.
[7]
？ QU Liqing, JIN Zuquan, ZHAO Tiejun, et al. Study on durablity parameter design of subsea tunnel reinforced concrete based on chloride corrosion [J]. Chin J Rock Mech Eng, 2007, 26(11): 2333–2340.
？ YANG Linde, GAO Zhanxue. The durability for concrete lining structure of highway-tunnel and the thickness of concrete cover [J]. China Civil Eng J, 2003, 36(12): 64？67.
[10]
？ KHATRI R P, SIRIVIVATANON V. Characteristic service life for concrete exposed to marine environments [J]. Cem Concr Res, 2004, 34(5): 745？752.
[11]
？ VEERACHAI Leelalerkiet, JE-WOON Kyung, MASAYASU Ohtsu. Analysis of half-cellpotential measurement for corrosion of reinforced concrete [J]. Construct Build Mater, 2004, 18(3): 155–162.
[12]
？ LAW D W, CAIRNS J, MILLARD S G, et al. Measurement of loss of steel from reinforcing bars in concrete using linear polarisation resistance measurements [J]. NDT & E Int, 2004, 37(5): 381–388.
[13]
？ FAN hong, FU Yandi, ZHAO Tiejun. Research on carbonation and chloride profiles of concrete after 21 years of exposure [J]. Ind Construct, 2011, 41(5): 14–18.
[14]
？ BATIS G, ROUTOULAS Th. Steel rebars corrosion investigation with strain gages [J]. Cem Concr Compos, 1999(21): 163–171.
[15]
？ GRAHAM Miller, PATRICK Gaydecki, SUNG Quek, et al. A combined Q and heterodyne sensor incorporating real-time DSP for reinforcement imaging, corrosion detection and material characterisation [J]. Sens Actuators A: Phys, 2005(121): 339–346.
[16]
？ SHAMSAD Ahmad. Reinforcement corrosion in concrete structures, its monitoring and service life prediction-a review [J]. Cem Concr Compos, 2003(25): 459–471.
[17]
？ GUSTAVO S Duffó, SILVIA B. Farina. Development of an embeddable sensor to monitor the corrosion process of new and existing reinforced concrete structures [J]. Construct Build Mater, 2009(23): 2746–2751.
[18]
？ LEGAT A. Monitoring of steel corrosion in concrete by electrode arrays and electrical resistance probes [J]. Electrochim Acta, 2007(52): 7590–7598.
[19]
？ RAUPACH M, SCHIEBL P. Macrocell sensor systems for monitoring of the corrosion risk of the reinforcement in concrete structures [J]. NDT & E Int, 2001(34): 435–442.？
