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| EXPERIMENTAL RESEARCH ON INFLUENCE OF SATURATION DEGREE ON SANDSTONE LONGITUDINAL WAVE
VELOCITY AND STRENGTH |
| DENG Huafeng1，2，YUAN Xianfan1，2，LI Jianlin1，2，HE Ming1，2，LUO Qian1，2，ZHU Min1，2 |
(1. Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area，China Three Gorges University，Yichang，Hubei 443002，China；2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry
of Education，China Three Gorges University，Yichang，Hubei 443002，China) |
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Abstract In the correlation research of rock saturation degree，longitudinal wave velocity and strength，the influences of saturation process and air-drying process on strength and longitudinal wave velocity are lack of comprehensive consideration；however，the study of these problems is of great significance for ultrasonic technology in the testing of rock physico-mechanical parameters. Based on these，typical layered sandstones in the Three Gorges reservoir area were selected，vertical-bedding samples and parallel-bedding samples were prepared to conduct saturation and air-drying experiment. The experimental results show that：(1) The relationship between longitudinal wave velocity and saturation degree is obviously nonlinear and nonmonotonic；the longitudinal wave velocity of water-bearing rock is not only related to saturation degree，but also associated with saturation process and air-drying process. (2) The anisotropy of sandstone is obvious；the longitudinal wave velocity change range of vertical-bedding rock is significantly greater than that of the parallel-bedding rock in the process of saturation and air-drying；and the anisotropic characteristics of the sandstone increase slightly under saturated state. (3) In the process of saturation and air-drying，the changing laws of compressive strength and longitudinal wave velocity are inconsistent. The adsorbed water which is on the surface of mineral particles and pore wall has a great influence on elastic modulus and strength；however，the influence of pore saturation degree on longitudinal wave velocity is more apparent. These research results have important reference value for the strength and longitudinal wave velocity tests of water-bearing rock；what?s more，the relevant test methods can provide reference for similar test.
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Received: 26 January 2013
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| [1] ARIOGLU E，TOKGOZ N. Estimation of rock strength rapidly and reliably by the Schmidt hammer[J]. Journal of Mines，Metals and Fuels，1991，39(9)：327–331.
[2] BEST A I，MECHAN C，SOTHCOTT J. The relationships between the velocities，attenuations，and petrophysical properties of reservoir sedimentary rocks[J]. Geophys Prosp，1994，42(1)：151–178.
[3] 邓华锋. 库水变幅带水–岩作用机制和作用效应研究[博士学位论文][D]. 武汉：武汉大学，2010.(DENG Huafeng. Study on the mechanism and effects of water-rock interaction under water level change region[Ph. D. Thesis] [D]. Wuhan：Wuhan University，2010. (in Chinese))
[4] 赵明阶，吴德伦. 工程岩体的超声波分类及强度预测[J]. 岩石力学与工程学报，2000，19(1)：89–92.(ZHAO Mingjie，WU Delun. The ultrasonic identification of rock mass classification and rock mass strength prediction[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(1)：89–92.(in Chinese))
[5] 邓华锋，李建林，邓成进，等. 岩石力学试验中岩样选择和抗压强度预测方法研究[J]. 岩土力学，2011，32(11)：3 399–3 403.(DENG Huafeng，LI Jianlin，DENG Chengjin，et al. Analysis of sampling in rock mechanics test and compressive strength prediction methods[J]. Rock and Soil Mechanics，2011，32(11)：3 399–3 403.(in Chinese))
[6] 李映霞. 不同饱水度砂岩的力学特性研究[硕士学位论文][D]. 宜昌：三峡大学，2011.(LI Yingxia. Research on mechanical of sandstone with different degree of saturation[M. S. Thesis][D]. Yichang：China Three Gorges University，2011.(in Chinese))
[7] 吴 勇. 不同含水条件下白云岩力学特性试验研究[硕士学位论文][D]. 昆明：昆明理工大学，2012.(WU Yong. Experimental research on mechanical characteristics of dolomite in different water conditions [M. S. Thesis][D]. Kunming：Kunming University of Science and Technology，2012.(in Chinese))
[8] 陈钢林，周仁德. 水对受力岩石变形破坏宏观力学效应的实验研究[J]. 地球物理学报，1991，34(3)：335–342.(CHEN Ganglin，ZHOU Rende. An experimental study concerning the macroscopic effect of water on the deformation and failure of loaded rocks[J]. Chinese Journal of Geophysics，1991，34(3)：335–342.(in Chinese))
[9] 朱合华，周治国，邓 涛. 饱水对致密岩石声学参数影响的试验研究[J]. 岩石力学与工程学报，2005，24(5)：823–828.(ZHU Hehua，ZHOU Zhiguo，DENG Tao. Acoustic parameters of low-porosity rock under dry and saturated conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(5)：823–828.(in Chinese))
[10] 邓 涛，韩文峰，保翰章. 饱水大理岩的波速变化特性研究[J]. 岩石力学与工程学报，2000，19(6)：762–765.(DENG Tao，HAN Wenfeng，BAO Hanzhang. On the characteristics of wave velocity variations for marbles saturated in water[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：762–765.(in Chinese))
[11] 刘 斌，KERN H，POPP T. 不同围压下孔隙度不同的干燥及水饱和岩样中的纵横波速度及衰减[J]. 地球物理学报，1998，41(4)：537–546.(LIU Bin，KERN H，POPP T. Velocities and attenuation of P- and S-waves in dry and wet rocks with different porosities under different confining pressures[J]. Chinese Journal of Geophysics，1998，41(4)：537–546.(in Chinese))
[12] 席道瑛，邱文亮，程经毅，等. 饱和多孔岩石的衰减与孔隙率和饱和度的关系[J]. 石油地球物理勘探，1997，32(2)：196–201.(XI Daoying，QIU Wenliang，CHENG Jingyi，et al. Relation between attenuation and porosity or saturation of rock[J]. Oil Geophysical Prospecting，1997，32(2)：196–201.(in Chinese))
[13] DOMENICO S N. Effects of water saturation on seismic reflectivity of sand reservoirs encased in shales[J]. Geophysics，1974，39(6)： 759–769.
[14] KNIGHT R，NOLEN-HOEKSEMA R. A laboratory study of the dependence of elastic wave velocities on pore scale fluid distribution[J]. Geophysical Research Letters，1990，17(10)：1529–1532.
[15] 施行觉，徐果明，靳 平，等. 岩石的含水饱和度对纵、横波速及衰减影响的实验研究[J]. 地球物理学报，1995，38(增1)：281–287. (SHI Xingjue，XU Guoming，JIN Ping，et al . The laboratory study of influence of water saturation on rock?s velocity and attenuation[J]. Chinese Journal of Geophysics，1995，38(Supp.1)：281–287.(in Chinese))
[16] KAHRAMAN S. The correlations between the saturated and dry P-wave velocity of rocks[J]. Ultrasonics，2007，46(4)：341–348.
[17] GREGORY A R. Fluid saturation effect on dynamic elastic properties of sedimentary rocks[J]. Geophysics，1976，41(5)：895–921.
[18] 王大兴，辛可锋，李幼铭，等. 地层条件下砂岩含水饱和度对波速及衰减影响的实验研究[J]. 地球物理学报，2006，49(3)：908–914. (WANG Daxing，XIN Kefeng，LI Youming，et al. An experimental study of influence of water saturation on velocity and attenuation in sandstone under stratum conditions[J]. Chinese Journal of Geophysics，2006，49(3)：908–914.(in Chinese))
[19] 中华人民共和国行业标准编写组. SL264—2001水利水电工程岩石试验规程[S]. 北京：中国水利水电出版社，2001.(The Professional Standards Compilation Group of People?s Republic of China. SL264—2001 Specifications for rock tests in water conservancy and hydroelectric engineering[S]. Beijing：China Water Power Press，2001.(in Chinese))
[20] WYLLIE M R J. Elastic wave velocities in heterogeneous and porous media[J]. Geophysics，1956，21(1)：41–70.
[21] BERRYMAN J G. Confirmation of Biot?s theory[J]. Applied Physics Letters，1980，37(4)：382–384.
[22] WHITE J E. Computed seismic speeds and attenuation in rocks with partial gas saturation [J]. Geophysics，1975，40(2)：224–232 |
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2013, Vol. 32 
