砂粒充填大理岩节理剪切强度试验研究
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摘要
节理充填对节理力学性质具有重要影响,为研究砂粒充填对节理抗剪强度的影响,利用GCTS(RDS-200型)岩石剪切系统对4种粒径砂粒充填的粉晶大理岩节理进行了直剪试验。结果表明:未充填节理剪切应力位移全程曲线可分为压缩阶段、弹性阶段、屈服阶段、软化阶段和残余阶段,而充填节理剪切应力位移全程曲线则仅有压缩阶段和硬化阶段,表现出松砂剪切曲线特征;相同法向应力下,4种粒径砂粒充填节理峰值剪切应力明显降低。多层铺设3种较细粒径砂粒的充填对节理粘聚力和内摩擦角的影响基本相同,粘聚力和内摩擦角均降低,且粘聚力降低更为明显;单层铺设的最大粒径砂粒使节理的粘聚力降低,内摩擦角增加。研究结论对理解充填节理岩体稳定性具有一定帮助。
Joint filling has important influence on the mechanical properties of rock joints. In order to study the effect of sandy filling on the shear strength of rock joint,direct shear tests were conducted on jointed fine-grained marble specimens filled with four particle sizes of sand. The results show that the complete shear stress-shear displacement curves of unfilled joints can be divided into compression stage,elastic stage,yield stage,softening stage and residual stage. However,those of filled rock joints only exist compression stage and hardening stage. The peak shear strength of jointed marble specimens fills with four particle sizes of sand reduced under the same normal stress obviously compared with those of unfilled rock joints. The effect of filling the three types of sand with smaller particle sizes on cohesion and internal frictional angle of marble joint is basically same. Specially,cohesion and internal friction angle both decrease,however the cohesion decreases more significantly. For the jointed marble filled with the sand with biggest particle size,the cohesion decreases while the internal frictional angle increases obviously for a single layer of sand. The research conclusions are helpful to understand the stability of rock mass with filled joints.
Joint filling has important influence on the mechanical properties of rock joints. In order to study the effect of sandy filling on the shear strength of rock joint,direct shear tests were conducted on jointed fine-grained marble specimens filled with four particle sizes of sand. The results show that the complete shear stress-shear displacement curves of unfilled joints can be divided into compression stage,elastic stage,yield stage,softening stage and residual stage. However,those of filled rock joints only exist compression stage and hardening stage. The peak shear strength of jointed marble specimens fills with four particle sizes of sand reduced under the same normal stress obviously compared with those of unfilled rock joints. The effect of filling the three types of sand with smaller particle sizes on cohesion and internal frictional angle of marble joint is basically same. Specially,cohesion and internal friction angle both decrease,however the cohesion decreases more significantly. For the jointed marble filled with the sand with biggest particle size,the cohesion decreases while the internal frictional angle increases obviously for a single layer of sand. The research conclusions are helpful to understand the stability of rock mass with filled joints.
引文
[1]Barton N.Review of a new shear strength criterion for rock joints[J].Engineering Geology,1973,7(4):287-332.
[2]Barton N,Choubey V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1-2):1-54.
[3]Ladanyi B,Archambault G.Simulation of shear behaviour of a joint rock mass[A]//Proceedings of the11th US Symposium on Rock Mechanics(USRMS)[C].1969:105-125.
[4]Kulatilake P,Shou G,Huang T H,et al.New peak shear strength criterion for anisotropic rock joints[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abastracts,1996,32(7):673-697.
[5]Grasselli G.Shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295-314.
[6]刘冬寿.岩体抗剪强度试验方法及分析[J].地下空间与工程学报,2015,11(增2):443-446.(Liu Dongshou.Experimental method and analysis of shear strength of rock body[J].Chinese Journal of Underground Space and Engineering,2015,11(Supp.2):443-446.(in Chinese))
[7]刘健,陈亮,刘建锋,等.深部花岗岩中天然开启节理剪切性能试验研究[J].地下空间与工程学报,2017,13(1):63-70.(Liu Jian,Chen Liang,Liu Jianfeng,et al.Experimental study on shear behavior of naturally opened joint in deep granite[J].Chinese Journal of Underground Space and Engineering,2017,13(1):63-70.(in Chinese))
[8]王德咏,王永平,莫海鸿.含内置裂隙的节理岩体的剪切行为数值模拟[J].地下空间与工程学报,2016,12(增2):488-492.(Wang Deyong,Wang Yongping,Mo Haihong.Numerical study of shear behavior of rock joints with embedded crack[J].Chinese Journal of Underground Space and Engineering,2016,12(Supp.2):488-492.(in Chinese))
[9]张驰,王文松,曹冠森.不同应力下剪切速率对尾矿砂强度特性影响研究[J].地下空间与工程学报,2016,12(增2):463-469.(Zhang Chi,Wang Wensong,Cao Guansen.Analysis on the influence of shear velocity on tailing sand shear strength under different stress[J].Chinese Journal of Underground Space and Engineering,2016,12(Supp.2):463-469.(in Chinese))
[10]Indraratna B,Oliverira D A F,Brown E T,et al.Effect of soil-infilled joints on the stability of rock wedges formed in a tunnel roof[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(5):739-751.
[11]Indraratna B,Welideniya H S,Brown E T.A shear strength model for idealised infilled joints under constant normal stiffness[J].Géotechnique,2005,55(3):215-226.
[12]Indraratna B,Jayanathan M,Brown T.Shear strength model for overconsolidated clay-infilled idealised rock joints[J].Geotechnique,2008,58(1):55-65.
[13]Davies M C R,Hamza O,Lumsden B W,et al.Laboratory measurement of the shear strength of icefilled rock joints[J].Annals of Glaciology,2000,31(1):463-467.
[14]Jahanian H,Sadaghiani M H.Experimental study on the shear strength of Sandy clay infilled regular rough rock joints[J].Rock Mechanics and Rock Engineering,2015,48(3):907-922.
[15]Pereira J P.Rolling friction and shear behaviour of rock discontinuities filled with sand[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(3):1-17.
[16]Ladanyi B,Archambault G.Shear strength and Deformability of Filled Indented Joints[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1997,17(1):317-326.
[17]Lu Y L,Wang L G,Li Z L,et al.Experimental study on the shear behavior of regular sandstone joints filled with cement grout[J].Rock Mechanics and Rock Engineering,2016,50(5):1-16.
[18]Dong H Y,Guo B H,Li Y Z,et al.Empirical peak shear strength formula for rock fractures based on 3Dmorphology parameters[J].Geotechnical and Geological Engineering,2017,35(3):1169-1183.
[19]Grasselli G.Shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295-314.
[20]沈明荣,陈建峰.岩体力学[M].上海:同济大学出版社,2006.(Sheng Mingrong,Chen Jianfeng.Rock mass mechanics[M].Shanghai:Tongji University Press,2006.(in Chinese))
[21]中华人民共和国国家发展和改革委员会.水利水电工程土工试验规程(DL/T 5355-2006)[S].北京:2006.(National Development and Reform Commission,People’s Republic of China.Code for soil tests for hydropower and water conservancy engineering(DL/T5355-2006)[S].Beijing:2006.(in Chinese))
[22]焦峰,郭保华,翟明磊.砂土充填大理岩节理的剪切强度经验公式[J].岩土力学,2018,39(11):4102-4108.(Jiao Feng,Guo Baohua,Zhai Minglei.Empirical formula for shear strength of marble joints infilled with sands[J].Rock and Soil Mechanics,2018,39(11):4102-4108.(in Chinese))
[2]Barton N,Choubey V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1-2):1-54.
[3]Ladanyi B,Archambault G.Simulation of shear behaviour of a joint rock mass[A]//Proceedings of the11th US Symposium on Rock Mechanics(USRMS)[C].1969:105-125.
[4]Kulatilake P,Shou G,Huang T H,et al.New peak shear strength criterion for anisotropic rock joints[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abastracts,1996,32(7):673-697.
[5]Grasselli G.Shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295-314.
[6]刘冬寿.岩体抗剪强度试验方法及分析[J].地下空间与工程学报,2015,11(增2):443-446.(Liu Dongshou.Experimental method and analysis of shear strength of rock body[J].Chinese Journal of Underground Space and Engineering,2015,11(Supp.2):443-446.(in Chinese))
[7]刘健,陈亮,刘建锋,等.深部花岗岩中天然开启节理剪切性能试验研究[J].地下空间与工程学报,2017,13(1):63-70.(Liu Jian,Chen Liang,Liu Jianfeng,et al.Experimental study on shear behavior of naturally opened joint in deep granite[J].Chinese Journal of Underground Space and Engineering,2017,13(1):63-70.(in Chinese))
[8]王德咏,王永平,莫海鸿.含内置裂隙的节理岩体的剪切行为数值模拟[J].地下空间与工程学报,2016,12(增2):488-492.(Wang Deyong,Wang Yongping,Mo Haihong.Numerical study of shear behavior of rock joints with embedded crack[J].Chinese Journal of Underground Space and Engineering,2016,12(Supp.2):488-492.(in Chinese))
[9]张驰,王文松,曹冠森.不同应力下剪切速率对尾矿砂强度特性影响研究[J].地下空间与工程学报,2016,12(增2):463-469.(Zhang Chi,Wang Wensong,Cao Guansen.Analysis on the influence of shear velocity on tailing sand shear strength under different stress[J].Chinese Journal of Underground Space and Engineering,2016,12(Supp.2):463-469.(in Chinese))
[10]Indraratna B,Oliverira D A F,Brown E T,et al.Effect of soil-infilled joints on the stability of rock wedges formed in a tunnel roof[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(5):739-751.
[11]Indraratna B,Welideniya H S,Brown E T.A shear strength model for idealised infilled joints under constant normal stiffness[J].Géotechnique,2005,55(3):215-226.
[12]Indraratna B,Jayanathan M,Brown T.Shear strength model for overconsolidated clay-infilled idealised rock joints[J].Geotechnique,2008,58(1):55-65.
[13]Davies M C R,Hamza O,Lumsden B W,et al.Laboratory measurement of the shear strength of icefilled rock joints[J].Annals of Glaciology,2000,31(1):463-467.
[14]Jahanian H,Sadaghiani M H.Experimental study on the shear strength of Sandy clay infilled regular rough rock joints[J].Rock Mechanics and Rock Engineering,2015,48(3):907-922.
[15]Pereira J P.Rolling friction and shear behaviour of rock discontinuities filled with sand[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(3):1-17.
[16]Ladanyi B,Archambault G.Shear strength and Deformability of Filled Indented Joints[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1997,17(1):317-326.
[17]Lu Y L,Wang L G,Li Z L,et al.Experimental study on the shear behavior of regular sandstone joints filled with cement grout[J].Rock Mechanics and Rock Engineering,2016,50(5):1-16.
[18]Dong H Y,Guo B H,Li Y Z,et al.Empirical peak shear strength formula for rock fractures based on 3Dmorphology parameters[J].Geotechnical and Geological Engineering,2017,35(3):1169-1183.
[19]Grasselli G.Shear strength of rock joints based on quantified surface description[J].Rock Mechanics and Rock Engineering,2006,39(4):295-314.
[20]沈明荣,陈建峰.岩体力学[M].上海:同济大学出版社,2006.(Sheng Mingrong,Chen Jianfeng.Rock mass mechanics[M].Shanghai:Tongji University Press,2006.(in Chinese))
[21]中华人民共和国国家发展和改革委员会.水利水电工程土工试验规程(DL/T 5355-2006)[S].北京:2006.(National Development and Reform Commission,People’s Republic of China.Code for soil tests for hydropower and water conservancy engineering(DL/T5355-2006)[S].Beijing:2006.(in Chinese))
[22]焦峰,郭保华,翟明磊.砂土充填大理岩节理的剪切强度经验公式[J].岩土力学,2018,39(11):4102-4108.(Jiao Feng,Guo Baohua,Zhai Minglei.Empirical formula for shear strength of marble joints infilled with sands[J].Rock and Soil Mechanics,2018,39(11):4102-4108.(in Chinese))