In permafrost region, rock joint as a mechanical weakness has great influence on the safety and durability of engineering projects. Studying the mechanical properties of frozen rock is of great significance for engineering construction in permafrost regions. To investigate the shear mechanical performance of frozen rock joints, four sets of natural joint surfaces of tuff collected from G214 National Highway in Qinghai Province were selected for direct shear test after being frozen at given temperature. Results show that the peak strength of the frozen rock joint is proportional to normal stress, and is inversely proportional to opening degree and roughness. When the opening of joint surface is greater than the maximum fluctuation of joint, the joint surface is dominated by disconnection failure mode, and the peak shear strength is controlled by adhesive force between ice and contact surface; when the opening of joint surface is smaller than the maximum fluctuation, ice shearing failure is the dominant failure mode under small normal stress; while under large normal stress, shearing failure of ice and rock both exist, and the peak shear strength is determined by the shear strength of both ice and rock joint. Furthermore, the peak shear strength criteria for frozen rock joints with various failure modes were derived.
Key words
Dangka hydropower station /
local scour /
dynamic mesh /
VOF /
shear stress /
sediment transport rate /
depth and topography
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References
[1] PATTON F D. Multiple Modes of Shear Failure in Rock[C]∥International Society for Rock Mechanics and Rock Engineering, 1st ISRM Congress, Lisbon, Portugal, September 25th-October 1st,1966:509-513.
[2] BARTON N R. Review of a New Shear-strength Criterion for Rock Joints [J]. Engineering Geology,1973, 7(4): 287-332.
[3] ZHAO J. Joint Surface Matching and Shear Strength Part B: JRC-JMC Shear Strength Criterion [J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(2):179-185.
[4] ZHAO J. Joint Surface Matching and Shear Strength Part A: Joint Matching Coefficient(JMC)[J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(2):173-178.
[5] 王 刚,张学朋,蒋宇静,等.一种考虑剪切速率的粗糙结构面剪切强度准则[J].岩土工程学报,2015,37(8):1399-1404.
[6] GRASSELLI G. Shear Strength of Rock Joints Based on Quantified Surface Description[D]. Switzerland: Swiss Federal Institute of Technology, 2001.
[7]GRASSELLI G, EGGER P. Constitutive Law for the Shear Strength of Rock Joints Based on Three-dimensional Surface Parameters [J]. International Journal of Rock Mechanics and Mining Sciences, 2003, 40(1): 25-40.
[8]GRASSELLI G. Manuel Rocha Medal Recipient Shear Strength of Rock Joints Based on Quantified Surface Description [J]. Rock Mechanics and Rock Engineering, 2006, 39(4): 295-314.
[9] 孙辅庭,佘成学,万利台,等.基于三维形貌特征的岩石节理峰值剪切强度准则研究[J].岩土工程学报,2014,36(3):529-536.
[10]孙辅庭,佘成学,万利台. 充填水泥浆岩石节理峰值剪切强度模型[J]. 岩石力学与工程学报,2014,33(12):2481-2489.
[11]唐志成,夏才初,宋英龙.粗糙节理的峰值剪切强度准则[J].岩土工程学报,2013,35(3):571-577.
[12]罗天一,宋轶充,张丽敏,等.人工淡水冰的单轴压缩强度试验技术[J].工程与试验,2008,(4):24-26,38.
[13]张丽敏,李志军,贾 青,等.人工淡水冰单轴压缩强度试验研究[J].水利学报,2009,40(11):1392-1396.
[14]贾 青,李志军,韩红卫,等.水库淡水冰剪切强度试验研究[J].数学的实践与认识,2015,45(5):132-137.
[15]陈世江,朱万成,王创业,等.考虑各向异性特征的三维岩体结构面峰值剪切强度研究[J].岩石力学与工程学报,2016,35(10): 2013-2021.
[16]王水林,郭明伟,王万军,等.节理面剪切应力-切向位移曲线峰值后区特性的初步研究[J].岩石力学与工程学报,2016,35(增2): 3805-3812.
[17]唐 珊.表面特性对冰粘附强度影响的研究[D].广州:广州大学,2014.
[18]刘 波,刘 念,李东阳,等.含冰软弱面的冻结裂隙红砂岩的强度试验[J].煤炭学报,2016,41(4):843-849.
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