不同含水状态砂岩分级循环荷载试验研究
An experimental study of cyclic loading of sandstone under different water contents
-
摘要: 为探究不同含水状态砂岩在循环荷载作用下的力学行为差异，对干燥、天然以及饱和三种含水状态下的砂岩进行了单轴分级循环加卸载试验。研究结果表明：由于水对砂岩的物理化学软化作用，饱水、天然以及干燥状态下的强度依次递减，而变形依次增加；卸载模量随着循环周次的增加呈先增大后减小的整体趋势，同一循环周次下，含水量越高，其卸载模量越小；体积应变开始出现拐点时的循环周次正好与卸载模量转折点所处的加卸载周次相对应；能量值随循环周次的增加均呈幂函数型增长，同一循环周次下，含水率越高的砂岩各项能量值越大；基于能量耗散的损伤定义表明：砂岩初始损伤值不为零，且均经历了一个先减小后增大的损伤演化过程，相同循环周次下，饱和、天然以及干燥砂岩的损伤量依次增大。Abstract: In order to explore the difference in the mechanical behavior of sandstone under cyclic loading with different water contents, the uniaxial cyclic loading and unloading tests are conducted for the sandstone under dry, natural and saturated conditions. The results show that the strength of the saturated, natural and dry conditions decreases but the deformation increases because of the softening effect of physical chemistry. The unloading modulus increases first and then decreases with the increasing cycle times and the higher the water content, the smaller the unloading modulus in the same cycle. The volume strain occur an inflection point when the cycles are coincided with the turning point of unloading modulus through the bad times. The energy value with cycles is a power function of the growth and in the same cycle, the higher the water content is, the greater the energy value of the sandstone is. The damage definition based on energy dissipation shows that the initial damage value of sandstone is not zero, and the damage evolution process reduces and then increases. The damage amount of the saturated, natural and dry sandstone increases in turn in the same cycle.
-
Keywords:
- sandstone /
- water content /
- cyclic loading and unloading /
- unloading modulus /
- energy /
- damage
-
-
[1] ［1］周家文，杨兴国，符文熹,等. 脆性岩石单轴循环加卸载试验及断裂损伤力学特性研究［J］. 岩石力学与工程报,2010,29(6):1172-1183. ［ZHOU J W，YANG X G，FU W X，et al. Experimental test and fracture damage mechanical characteristics of brittle rock under uniaxial cyclic loading and unloading conditions ［J］. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(6): 1172- 1183.(in Chinese)］
[2] ［2］张志镇, 高峰. 单轴压缩下红砂岩能量演化试验研究［J］. 岩石力学与工程学报,2012, 31(5):953-962. ［ ZHANG Z Z,GAO F. Experimental research on energy evolution of red sandstone samples under uniaxial compression［J］. Chinese Journal of Rock Mechanics and Engineering, 2012,31(5):953-962. (in Chinese)］
[3] ［3］张媛，许江，杨红伟，等.循环荷载作用下围压对砂岩滞回环演化规律的影响［J］. 岩石力学与工程学报，2011,30（2）：320-326. ［ZHANG Y，XU J，YANG H W，et al. Effect of confining pressure on evolution law of hysteresis loop of sandstone under cyclic loading［J］. Chinese Journal of Rock Mechanics and Engineering, 2011,30（2）：320-326. (in Chinese)］
[4] ［4］胡大伟，周辉，潘鹏志，等. 砂岩三轴循环加卸载条件下的渗透率研究［J］.岩土力学，2010,31（9）：2749-2754. ［HU D W，ZHOU H，PAN P Z，et al. Study of permeability of sandstone in triaxial cyclic stress tests［J］. Rock and Soil Mechanics, 2010,31（9）：2749-2754. (in Chinese)］
[5] ［5］孔茜，王环玲，徐卫亚. 循环加卸载作用下砂岩孔隙度与渗透率演化规律试验研究［J］. 岩土工程学报,2015,37(10):1893-1900. ［KONG Q, WANG H L, XU W Y. Experimental study on permeability and porosity evolution of sandstone under cyclic loading and unloading［J］. Chinese Journal of Geotechnical Engineering, 2015,37(10):1893-1900. (in Chinese)］
[6] ［6］张春会，赵全胜. 饱水度对砂岩模量及强度影响的三轴试验［J］. 岩土力学，2014，35（4）：951-958. ［ZHANG C H，ZHAO Q S. Viscoelastic properties of saturated sandstones under fatigue loading［J］. Rock and Soil Mechanics, 2014，35（4）：951-958. (in Chinese)］
[7] ［7］邓华锋，肖志勇，李建林，等. 水岩作用下损伤砂岩强度劣化规律试验研究［J］. 岩石力学与工程学报，2015,34（增刊1）：2690-2698. ［DENG H F，XIAO Z Y，LI J L，et al. Deteriorating change rule test research of damage sandstone strength under water-rock interaction［J］. Chinese Journal of Rock Mechanics and Engineering, 2015,34（Sup1）：2690-2698. (in Chinese)］
[8] ［8］陈运平，王思敬. 多级循环荷载下饱和岩石的弹塑性响应［J］.岩土力学，2010,31（4）：1030-1034. ［CHEN Y P, WANG S J. Elastoplastic response of saturated rocks subjected to multilevel cyclic loading［J］. Rock and Soil Mechanics, 2010,31（4）：1030-1034. (in Chinese)］
[9] ［9］席道瑛，杜 赟，席军，等. 饱和砂岩在疲劳载荷作用下的黏弹性性质［J］. 岩石力学与工程学报，2011,30（5）：865-870. ［XI D Y，DU Y，XI J，et al. Viscoelastic properties of saturated sandstones under fatigue loading［J］. Chinese Journal of Rock Mechanics and Engineering, 2011,30（5）：865-870. (in Chinese)］
[10] ［10］中华人民共和国住房和城乡建设部. GB/T 50266-2013工程岩体试验方法标准［S］.北京：中国计划出版社，2013. ［Ministry of Housing and Urban-Rural Development of the People’s Republic of China. GB/T 50266-2013 Standard for tests method of engineeringrock massas［S］. Beijing: China Planning Press, 1999. (in Chinese)］
[11] ［11］王者超, 赵建纲, 李术才, 等. 循环荷载作用下花岗岩疲劳力学性质及其本构模型［J］. 岩石力学与工程学报, 2012, 31(9): 1888-1900. ［WANG Z C,ZHAO J G,LI SHU C, et al. Fatigue mechanical behavior of granite subjected to cyclic load and its constitutive model［J］. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(9): 1888-1900. (in Chinese)］
[12] ［12］陈宗基, 康文法, 黄杰藩. 岩石的封闭应力, 蠕变和扩容及本构方程［J］. 岩石力学与工程学报, 1991, 10(4): 299-312. ［LU Z J, KANG W F, HUANG J F.On the locked in stress ,creep and dilatation of rocks, and the constitutive equations［J］. Chinese Journal of Rock Mechanics and Engineering，1991, 10(4): 299-312. (in Chinese)］
[13] ［13］谢吉尊，冯文凯，胡云鹏，等. 天然和饱水状态下泥岩力学性质及损伤变形能量特征分析［J］.水文地质工程地质，2016，43（3）：66-73. ［ XIE J Z，FENG W K，HU Y P, et al. An analysis of the mechanical properties and energy characteristics of damage deformation of mudstone under natural and saturated states［J］. Hydrogeology & Engineering Geology, 2016，43（3）：66-73. (in Chinese)］
[14] ［14］金丰年，蒋美蓉，高小玲，等.基于能量耗散定义损伤变量的方法［J］. 岩石力学与工程学报，2004,23（12）：1976-1980. ［JIN F N，JIANG M R，GAO X L，et al. Defining damage variable based on energy dissipation［J］. Chinese Journal of Ｒock Mechanics and Engineering，2004,23（12）：1976-1980. (in Chinese)］
[15] ［15］谢和平，鞠 杨，董毓利. 经典损伤定义中的“弹性模量法”探讨［J］.力学与实践，1997，19(2)：1–5. ［XIE H P，JU Y，DONG S L. Discuss on elastic modulus method of classical damage definition［J］.Mechanics in Engineering，1997，19(2)：1–5. (in Chinese)］
[16] ［16］鞠杨，谢和平. 基于应变等效性假说的损伤定义的适用条件［J］.应用力学学报，1998，15(1)：43–51. ［JU Y，XIE H P. Avariable condition of the damage description based on hypothesis of strain equivalence［J］. Chinese Journal of Applied Mechanics，1998，15(1)：43–51. (in Chinese)］
计量
- 文章访问数: 1006
- HTML全文浏览量: 14
- PDF下载量: 710
下载:
邮件订阅
RSS