密度与应力水平对珊瑚砂颗粒破碎影响试验研究
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摘要
珊瑚砂在剪切过程中容易发生颗粒破碎,而颗粒破碎与应力水平、初始密度以及应力路径等因素有关。为了研究密度和应力水平对珊瑚砂颗粒破碎的影响,对珊瑚砂进行了三轴压缩试验和侧限压缩试验。文中建立了三轴压缩条件下颗粒相对破碎与围压和试样初始孔隙比之间的定量关系表达式,以及相对破碎与试样平均粒径之间的关系表达式。研究表明,在三轴压缩和侧限压缩条件下,试样的相对破碎均随着应力水平(围压或竖向应力)和试样密度的增大而增大,但两种应力路径下的颗粒破碎程度有显著的不同。
During the shearing process,coral sand is prone to particle breakage,which is related to stress level,initial density and stress path. In order to study the effect of density and stress level on the particles breakage of coral sand,triaxial compression tests and one-dimensional compression tests were carried out. In this paper,the quantitative relationship between the relative breakage of particles and the confining pressure and the initial void ratio of the specimen under triaxial compression is established,as well as the relationship between the relative breakage and the average particle size of the sample. The results show that,under triaxial compression and one-dimensional compression,the relative breakage increases with the increase of stress level(confining pressure or vertical stress) and sample density,but the degree of particle breakage under the two stress paths is significantly different.
During the shearing process,coral sand is prone to particle breakage,which is related to stress level,initial density and stress path. In order to study the effect of density and stress level on the particles breakage of coral sand,triaxial compression tests and one-dimensional compression tests were carried out. In this paper,the quantitative relationship between the relative breakage of particles and the confining pressure and the initial void ratio of the specimen under triaxial compression is established,as well as the relationship between the relative breakage and the average particle size of the sample. The results show that,under triaxial compression and one-dimensional compression,the relative breakage increases with the increase of stress level(confining pressure or vertical stress) and sample density,but the degree of particle breakage under the two stress paths is significantly different.
引文
[1] GB/T 50279-2014,岩土工程基本术语标准[S].北京:中国计划出版社,2014.
[2]吴京平,褚瑶,楼志刚.颗粒破碎对钙质砂变形及强度特性的影响[J].岩土工程学报,1997,19(5):49-55.
[3]张家铭,蒋国盛,汪稔.颗粒破碎及剪胀对钙质砂抗剪强度影响研究[J].岩土力学,2009,30(7):2043-2048.
[4]刘崇权,汪稔.钙质砂在三轴剪切中颗粒破碎评价及其能量公式[J].工程地质学报,1999,7(4):366-371.
[5] HARDIN B O. Crushing of soil particles[J]. Journal of Geotechnical Engineering,1985,111(10):1177-1192.
[6]张家铭,张凌,蒋国盛,等.剪切作用下钙质砂颗粒破碎试验研究[J].岩土力学,2008,29(10):2789-2793.
[7] SHAHNAZARI H,REZVANI R. Effective parameters for the particle breakage of calcareous sands:An experi?mental study[J]. Engineering Geology,2013,159(9):98-105.
[8]张家铭,汪稔,石祥锋,等.侧限条件下钙质砂压缩和破碎特性试验研究[J].岩石力学与工程学报,2005,24(18):3327-3331.
[9]毛炎炎,雷学文,孟庆山,等.考虑颗粒破碎的钙质砂压缩特性试验研究[J].人民长江,2017,48(9):75-78.
[10]王帅,雷学文,孟庆山,等.侧限条件下高压对钙质砂颗粒破碎影响研究[J].建筑科学,2017,33(5):80-87.
[11] COOP M R,SORENSEN K K,FREITAS T B,et al. Particle breakage during shearing of a carbonate sand[J].Geotechnique,2004,54(3):157-163.
[12] MIAO G,AIREY D. Breakage and ultimate states for a carbonate sand[J]. Geotechnique,2013,63(14):1221-1229.
[13] GB/T 50123-1999,土工试验方法标准[S].北京:中国计划出版社,1999.
[14] LEE K L,FARHOOMAND I. Compressibility and crushing of granular soil in anisotropic triaxial compression[J]. Can. Geotech. J.,1967,4(1):68-86.
[15]汪轶群,洪义,国振,等.南海钙质砂宏细观破碎力学特性[J].岩土力学,2018,39(1):199-206,215.
[2]吴京平,褚瑶,楼志刚.颗粒破碎对钙质砂变形及强度特性的影响[J].岩土工程学报,1997,19(5):49-55.
[3]张家铭,蒋国盛,汪稔.颗粒破碎及剪胀对钙质砂抗剪强度影响研究[J].岩土力学,2009,30(7):2043-2048.
[4]刘崇权,汪稔.钙质砂在三轴剪切中颗粒破碎评价及其能量公式[J].工程地质学报,1999,7(4):366-371.
[5] HARDIN B O. Crushing of soil particles[J]. Journal of Geotechnical Engineering,1985,111(10):1177-1192.
[6]张家铭,张凌,蒋国盛,等.剪切作用下钙质砂颗粒破碎试验研究[J].岩土力学,2008,29(10):2789-2793.
[7] SHAHNAZARI H,REZVANI R. Effective parameters for the particle breakage of calcareous sands:An experi?mental study[J]. Engineering Geology,2013,159(9):98-105.
[8]张家铭,汪稔,石祥锋,等.侧限条件下钙质砂压缩和破碎特性试验研究[J].岩石力学与工程学报,2005,24(18):3327-3331.
[9]毛炎炎,雷学文,孟庆山,等.考虑颗粒破碎的钙质砂压缩特性试验研究[J].人民长江,2017,48(9):75-78.
[10]王帅,雷学文,孟庆山,等.侧限条件下高压对钙质砂颗粒破碎影响研究[J].建筑科学,2017,33(5):80-87.
[11] COOP M R,SORENSEN K K,FREITAS T B,et al. Particle breakage during shearing of a carbonate sand[J].Geotechnique,2004,54(3):157-163.
[12] MIAO G,AIREY D. Breakage and ultimate states for a carbonate sand[J]. Geotechnique,2013,63(14):1221-1229.
[13] GB/T 50123-1999,土工试验方法标准[S].北京:中国计划出版社,1999.
[14] LEE K L,FARHOOMAND I. Compressibility and crushing of granular soil in anisotropic triaxial compression[J]. Can. Geotech. J.,1967,4(1):68-86.
[15]汪轶群,洪义,国振,等.南海钙质砂宏细观破碎力学特性[J].岩土力学,2018,39(1):199-206,215.