EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF SUPPORT SYSTEM FOR TUNNEL IN GYPSUM BRECCIA STRATUM
HE Benguo1，2，ZHU Yongquan1，2，SUN Minglei1，2，ZHANG Zhiqiang1
(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China)
Abstract：In-situ experiments of support system were carried out to investigate bolt axial force，surrounding rock pressure，steel framework stress and tunnel deformation of primary support，contact pressure and steel stress for lining. The results show that under condition of high water content gypsum breccia，the stress of primary support increases by 50 %，and the stress of lining increases by 30 % with respect to drying one. Particularly combined with drying gypsum breccia，bolts at hance were subjected to compression. Accordingly，it suggests that systematic bolts at arch should be cancelled；and only feet-lock bolt should be installed. This could reduce sealing time of primary support significantly. Nevertheless，in terms of high water content gypsum breccia，most of bolts at hance were subjected to tension. Therefore，bolt parameters should be unchanged. Framework of primary support can bear load and is of paramount to support system once it is installed. The results are not only applicable to deep tunnel in gypsum breccia stratum，but also can be as reference for similar engineering.
何本国1，2，朱永全1，2，孙明磊1，2，张志强1. 膏溶角砾岩隧道支护体系力学特性试验研究[J]. 岩石力学与工程学报, 2012, 31(5): 945-952.
HE Benguo1，2，ZHU Yongquan1，2，SUN Minglei1，2，ZHANG Zhiqiang1. EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF SUPPORT SYSTEM FOR TUNNEL IN GYPSUM BRECCIA STRATUM. , 2012, 31(5): 945-952.
2012, Vol. 31 
