试验研究层间错动带动孔压增长的影响因素
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摘要
对大光包滑坡层间错动带材料进行动三轴试验,研究在不同条件下动孔压的增长特性,试验结果表明:(1)频率对动孔压的增长没有影响,不同频率下试样达到液化的时间基本相同;(2)动应力越大,孔压增长越快,达到液化需要的振次越少;(3)饱和度对动孔压的增长有较大影响,饱和度越高,样品动孔压增长越快,达到液化需要的振次越少;饱和度降低,动孔压的增速减缓,在应变达到5%时样品没有液化;(4)干密度越小,动孔压增长越快;干密度越大,颗粒之间的咬合力和摩阻力越大,孔压增长缓慢。
In this paper,based on the triaxial test which is the bedding fault material in the Daguangbao landslide to research the growth characteristics of dynamic pore pressure under different conditions,the experimental results showed that:(1) Frequency has no effect on the growth of dynamic pore pressure,the time of sample liquefaction is the same under different frequency;(2) The pore pressure increase faster with the greater the dynamic stress,and the less the vibration times required for liquefaction;(3) Saturation has a great influence on the growth of the pore pressure,the faster dynamic pore pressure increase and the less vibration times required for liquefaction while sample has the higher the degree of saturation,with the reduce of saturation,the dynamic pore pressure of the growth is slowing and sample no liquefaction in the strain of 5%;(4) The faster dynamic pore pressure increase in the small of dry density,the pore pressure increase slowly for the greater the bite force and frictional resistance between particles when the dry density is the greater.
In this paper,based on the triaxial test which is the bedding fault material in the Daguangbao landslide to research the growth characteristics of dynamic pore pressure under different conditions,the experimental results showed that:(1) Frequency has no effect on the growth of dynamic pore pressure,the time of sample liquefaction is the same under different frequency;(2) The pore pressure increase faster with the greater the dynamic stress,and the less the vibration times required for liquefaction;(3) Saturation has a great influence on the growth of the pore pressure,the faster dynamic pore pressure increase and the less vibration times required for liquefaction while sample has the higher the degree of saturation,with the reduce of saturation,the dynamic pore pressure of the growth is slowing and sample no liquefaction in the strain of 5%;(4) The faster dynamic pore pressure increase in the small of dry density,the pore pressure increase slowly for the greater the bite force and frictional resistance between particles when the dry density is the greater.
引文
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8黄思杰,刘建民,曹久亭,等.珠海拱北隧道饱和砂土动力特性试验研究.科学技术与工程,2014;14(11):248-251Huang Sijie,Liu Jianmin,Cao Jiuting,et al.Study on dynamic characteristics of sands in Zhuhai-Gongbei tunnel.Science Technology and Engineering,2014;14(11):248-251
9裴向军,黄润秋,崔圣华,等.大光包滑坡岩体碎裂特征及其工程地质意义.岩石力学与工程学报,2015;34(增刊1):3106-3115Pei Xiangjun,Huang Runqiu,Cui Shenghua,et al.The rock mass cataclastic characteristics of Daguangbao landslide and its engineering geological significance.Chinese Journal of Rock Mechanics and Engineering,2015;34(S1):3106-3115
2黄润秋,裴向军,崔圣华.大光包滑坡滑带岩体碎裂特征及其形成机制研究.岩石力学与工程学报,2016;35(1):1-15Huang Runqiu,Pei Xiangjun,Cui Shenghua.Cataclastic characteristics and formation mechanism of the rock mass in sliding zone of Daguangbao landslide.Chinese Journal of Rock Mechanics and Engineering,2016;35(1):1-15
3张建民,王稳祥.振动频率对饱和砂土动力特性的影响.岩土工程学报,1990;12(1):89-97Zhang Jianmin,Wang Wenxiang.Effect of vibration frequency on dynamic behavior of saturated sand.Chinese Journal of Geotechnical Engineering,1990;12(1):89-97
4吴波,孙德安.非饱和粉土的液化特性研究.岩土力学,2013;34(2):411-416Wu Bo,Sun Dean.Study of liquefaction characteristics of unsaturated silt.Rock and Soil Mechanics,2013;34(2):411-416
5张超,杨春和,白世伟.尾矿料的动力特性试验研究.岩土力学,2006;27(1):35-40Zhang Chao,Yang Chunhe,Bai Shiwei.Experimental study on dynamic characteristics of tailings material.Rock and Soil Mechanics,2006;27(1):35-40
6张茹,何昌荣,费文平,等.固结应力比对土样动强度和动孔压发展规律的影响.岩土工程学报,2006;28(1):101-105Zhang Ru,He Changrong,Fei Wenping,et al.Effect of consolidation stress ratio on dynamic strength and dynamic pore water pressure of soil.Chinese Journal of Geotechnical Engineering,2006;28(1):101-105
7刘凯,张远芳.饱和含细砾砂动孔隙水压力特性三轴试验研究.科学技术与工程,2016;16(19):283-287Liu Kai,Zhang Yuanfang.Triaxial tests study on dynamic pore water pressure characteristics of saturated fine gravel sand.Science Technology and Engineering,2016;16(19):283-287
8黄思杰,刘建民,曹久亭,等.珠海拱北隧道饱和砂土动力特性试验研究.科学技术与工程,2014;14(11):248-251Huang Sijie,Liu Jianmin,Cao Jiuting,et al.Study on dynamic characteristics of sands in Zhuhai-Gongbei tunnel.Science Technology and Engineering,2014;14(11):248-251
9裴向军,黄润秋,崔圣华,等.大光包滑坡岩体碎裂特征及其工程地质意义.岩石力学与工程学报,2015;34(增刊1):3106-3115Pei Xiangjun,Huang Runqiu,Cui Shenghua,et al.The rock mass cataclastic characteristics of Daguangbao landslide and its engineering geological significance.Chinese Journal of Rock Mechanics and Engineering,2015;34(S1):3106-3115