露天矿高陡边坡软岩蠕变-大变形试验及本构模型
Creep-large deformation experiment and constitutive model of soft rock in high and steep slope of open-pit
-
摘要: 为探寻露天矿高陡边坡软岩蠕变-大变形规律，开展了软岩常规压缩、峰值前压缩蠕变和峰值后压缩蠕变等试验。试验结果显示：软岩常规应力-应变曲线表现出了明显的弹脆塑性向弹塑性转化的趋势，由于软岩的强度较低，该现象更加明显；软岩蠕应变对围压的敏感度较高，峰值前低围压时弱层软岩的蠕应变由2.5%增大到14.5%，说明软岩在低围压、高应力作用下具有典型的大变形特征；峰值后弱层软岩的蠕应变变化较小，说明其峰值后蠕变特性不稳定；峰值前的黏滞系数受围压的影响大，随着围压的增大，K体与M体的黏滞系数逐渐减小；围压对峰值后的黏滞系数影响较小，但对K体黏滞系数影响的要较M体的大，软岩会由弹性阶段向塑性阶段转化。在试验研究的基础上，建立了软岩BNSS蠕变-大变形本构模型。Abstract: For the sake of exploring the law of creep-large deformation of soft rock under high and steep slope in open-pit mine, conventional compression, pre-peak compression creep and post-peak compression creep experiments of soft rock were carried out. The results showed that: the conventional stress-strain curve of soft rock illustrates a clear tendency to transform from elastic-brittle plasticity to elastic-plastic plasticity. This phenomenon is more obvious due to the lower strength of soft rock; soft rock creep strain is more sensitive to confining pressure, which increases from 2.5% to 14.5% at low confining pressure before peak, which indicates that soft rock has typical large deformation characteristics under low confining pressure and high stress; the creep strain of weak soft rock has less change after peak, which indicates that the creep characteristics are unstable in this time; the viscosity coefficient before peak is greatly affected by the confining pressure. As the confining pressure increases, the viscosity coefficients of K-body and M-body gradually decrease; the confining pressure has little effect on the viscosity coefficient after the peak. However, the influence of the K-body viscosity coefficient is greater than that of the M-body, and soft rock with elastic stage will transform to plastic stage. Based on the experimental research, the BNSS creep-large deformation constitutive model of soft rock was established.
-
-
[1] 胡高建，杨天鸿，张飞.抚顺西露天矿南帮边坡破坏机理及内排压脚措施[J].吉林大学学报（地球科学版），2019，49（4）：1082-1092. HU Gaojian, YANG Tianhong, ZHANG Fei. Failure mechanism and internal dumping control measures of south slope in Fushun West Open-Pit Coal Mine[J]. Journal of Jilin University（Earth Science Edition）, 2019, 49（4）:1082-1092.
[2] 孙广明，胡高建，肖平，等.抚顺西露天矿边坡岩体强度计算及质量分级研究[J].煤炭科学技术，2017，45（12）：36-41. SUN Guangming, HU Gaojian, XIAO Ping, et al. Study on strength calculation and quality grading of slope rock in Fushun West Open Pit Mine[J]. Coal Science and Technology, 2017, 45（12）: 36-41.
[3] 滕超，王雷，刘宝华，等.辽宁抚顺西露天矿南帮滑坡应力变化规律及影响因素分析[J].中国地质灾害与防治学报，2018，29（2）：35-42. TENG Chao, WANG Lei, LIU Baohua, et al. Stress variation within the southern landslide of Fushun West Open-Pit and its influencing factors[J]. The Chinese Journal of Geological Hazard and Control, 2018, 29（2）: 35-42.
[4] 刘雄.岩石流变学概论[M].北京：地质出版社，1994. [5] Jamsawang P, Boathong P, Mairaing W, et al. Undrained creep failure of a drainage canal slope stabilized with deep cement mixing columns[J]. Landslides, 2016, 13（5）: 939-955. [6] Huan Zhang, Hongbao Zhao, Xiangyang Zhang, et al. Creep Characteristics and Model of Key Unit Rock in Slope Potential Slip Surface[J]. International Journal of Geomechanics, 2019, 19（8）: 04019094. [7] Hadiseh M, Rassoul A. Mechanical behavior of salt rock under uniaxial compression and creep tests[J]. International Journal of Rock Mechanics and Mining Sciences, 2018, 110: 19-27. [8] Gang Peng, Zhanqing Chen, Jiarui Chen, et al. Research on Rock Creep Characteristics Based on the Fractional Calculus Meshless Method[J]. Advances in Civil Engineering, 2018, 8: 1-6. [9] Tomanovic Z M, Miladinovic B, Zivaljevic S. Criteria for defining the required duration of a creep test[J]. Canadian Geotechnical Journal, 2014, 52（7）: 883-889. [10] 高芳芳.阿勒山露天煤矿边坡层间薄层滑带土蠕变特性研究[J].煤矿安全，2019，50（3）：57-60. GAO Fangfang. Study on creep characteristics of interlayer thin layer soil of slope in Aleshan Open Pit Coal Mine[J]. Safety in Coal Mines, 2019, 50（3）: 57-60.
[11] 王淑豪，林晓艺，纪海艳，等.典型红砂岩的蠕变特性研究[J].三明学院学报，2018，35（6）：13-18. WANG Shuhao, LIN Xiaoyi, JI Haiyan, et al. Study on the creep properties of typical red sandstone[J]. Journal of Sanming University, 2018, 35（6）: 13-18.
[12] 蔡煜，曹平.基于Burgers模型考虑损伤的非定常岩石蠕变模型[J].岩土力学，2016，37（S2）：369-374. CAI Yu, CAO Ping. A non-stationary model for rock creep considering damage based on Burgers model[J]. Rock and Soil Mechanics, 2016, 37（S2）: 369-374.
[13] 康永刚，张秀娥.基于Burgers模型的岩石非定常蠕变模型[J].岩土力学，2011，32（S1）：424-427. KANG Yonggang, ZHANG Xiue. A non-stationary model for rock creep based on Burgers model[J]. Rock and Soil Mechanics, 2011, 32（S1）: 424-427.
[14] 李成波.岩石蠕变实验及非定常参数粘弹模型[D].合肥：中国科学技术大学，2009. [15] 师文豪，杨天鸿，王培涛，等.露天矿边坡岩体稳定性各向异性分析方法及工程应用[J].岩土工程学报，2014，36（10）：1924. SHI Wenhao, YANG Tianhong, WANG Peitao, et al. Anisotropy analysis method for stability of open-pit slope rock mass and its application[J]. Chinese Jounal of Geotechnical Engineering, 2014, 36（10）: 1924.
-
期刊类型引用(4)
1. 徐智涵，刘显刚，周靖霖，黄显耀，吴骏. 贵州花鱼洞大桥岸坡长期稳定性数值模拟分析. 四川建材. 2024(07): 161-163 . 
百度学术
2. 费晓欧，缪海宾. 开挖扰动影响下露天矿边坡变形规律研究. 煤矿安全. 2024(08): 153-158 . 本站查看
3. 王振伟，许镇. 开采扰动作用下多弱层边坡蠕变变形规律研究. 北方工业大学学报. 2024(04): 90-97 . 百度学术
4. 徐树强，李营作，姜海涛，王智涛，李斌. 别斯库都克煤矿南帮边坡破坏机理及致灾模式. 露天采矿技术. 2023(02): 13-15+19 . 百度学术
其他类型引用(3)
计量
- 文章访问数: 42
- HTML全文浏览量: 0
- PDF下载量: 17
- 被引次数: 7
下载:
