|
|
|
| Determination of solidification time and reasonable strength of cemented backfill based on energy matching relationship
|
| WEN Zhenjiang1，XIAO Bolin1，2，WEI Hanbo1，BA Lei1，YANG Xiaobing1，GAO Qian1，CHEN Boyu3 |
| (1. Key Laboratory of High Efficient Mining and Safety of Metal Mine，Ministry of Education，University of Science and Technology Beijing，Beijing 100083，China；2. Department of Civil Engineering，University of Ottawa，Ottawa K1N6N5，Canada；3. Fujian Sangang Group Co.，Ltd.，Sanming，Fujian 737100，China) |
|
|
|
|
Abstract In order to achieve the goal of safe，efficient and low-cost mining，it is necessary to determine the reasonable strength of the backfill. Firstly，the test materials are analyzed to determine the ratio of mortar strength test. Secondly，according to the test results of different proportion of mortar，the relationship between the strength of backfill and the curing age is analyzed，and the relationship expression between them is established. Then，the matching coefficient K is introduced to characterize the matching relationship between cemented backfill and ore rock energy，and the reasonable strength of backfill is determined accordingly. Finally，according to the example of Makeng Iron Mine，the matching characteristics are analyzed，and the reasonable strength of backfill with different rock properties is determined respectively. And then the matching analysis between the solidification time of cemented backfill in one-step goaf and reasonable mining time of two-step pillar mining is carried out. On this basis，the ratio of filling slurry and the mining time of two-step are determined，and is verified by industrial filling. The results show that under the same condition of cement-sand ratio and slurry concentration，the strength of backfill increases exponentially with the curing age；the matching coefficient K of cemented backfill and ore rock energy is closely related to the deformation modulus and bulk density of ore rock，mining depth and strength of backfill；According to the energy matching characteristics of cemented backfill and ore rock，combined with the actual situation of the mine，when the ore rock is moderately stable，the filling ratio of one-step goaf is cement sand ratio of 1∶4 and concentration is 75%. When the ore rock is partially broken，the filling ratio of one-step goaf is cement sand ratio of 1∶4 and concentration is 78%，after solidification for 12 d and 17 d respectively，two-step stoping is carried out. After verification of industrial filling，the strength distribution of the sample ranges from 2.35 MPa to 3.28 MPa，which meet the requirements of mine strength.
|
|
|
|
|
|
| [1] BEN-AWUAH E，RICHTER O，ELKINGTON T，et al. Strategic mining options optimization：open pit mining，underground mining or both[J]. International Journal of Mining Science and Technology，2016，26(6)：1 065–1 071.
[2] DJURDJEVAC L，IGNJATOVIC D，LJUBOJEV M，et al. Change the uniaxial compressive strength of paste backfill depending on change the parameters[J]. Mining and Metallurgy Engineering Bor.，2016，(1)：17–24.
[3] 李夕兵，周 健，王少锋，等. 深部固体资源开采评述与探索[J]. 中国有色金属学报，2017，27(6)：1 236–1 262.(LI Xibing，ZHOU Jian，WANG Shaofeng，et al. Review and practice of deep mining for solid mineral resources[J]. The Chinese Journal of Nonferrous Metals，2017，27(6)：1 236–1 262.(in Chinese))
[4] LIU Z X，LAN M，XIAO S Y，et al. Damage failure of cemented backfill and its reasonable match with rock mass[J]. Transactions of Nonferrous Metal Society of China，2015，25：954–959.
[5] 刘 永，贺桂成，袁梅芳，等. 黄土–废石胶结充填体抗压强度试验研究[J]. 地下空间与工程学报，2013，9(1)：113–118.(LIU Yong，HE Guicheng，YUAN Meifang，et al. Experimental study on the compressive strength of the backfills of the cemented waste rock with cement and loess[J]. Chinese Journal of Underground Space and Engineering，2013，9(1)：113–118.(in Chinese))
[6] 刘志祥，李夕兵. 尾砂分形级配与胶结强度的知识库研究[J]. 岩石力学与工程学报，2005，24(10)：1 789–1 793.(LIU Zhixiang，LI Xibing. Study on fractal gradation of tailings and knowledge bank of its cementing strength[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(10)：1 789–1 793.(in Chinese))
[7] 徐文彬，宋卫东，王东旭，等. 胶结充填体三轴压缩变形破坏及能量耗散特征分析[J]. 岩土力学，2014，35(12)：3 421–3 429.(XU Wenbin，SONG Weidong，WANG Dongxu，et al. Characteristic analysis of deformation failure and energy dissipation of cemented backfill body under triaxial compression[J]. Rock and Soil Mechanics，2014，35(12)：3 421–3 429.(in Chinese))
[8] 刘志祥，李夕兵，戴塔根. 尾砂胶结充填体损伤模型及与岩体的匹配分析[J]. 岩土力学，2006，27(9)：1 442–1 446.(LIU Zhixiang，LI Xibing，DAI Tagen. On damage model of cemented tailings backfill and its match with rock mass[J]. Rock and Soil Mechanics，2006，27(9)：1 442–1 446.(in Chinese))
[9] THOMAS E G，NANTEL J H，NOTLEY K R. Fill technology in underground metalliferous mines[J]. International Academic Services， 1979：35–41.
[10] 贺桂成，刘 永，丁德馨，等. 废石胶结充填体强度特性及其应用研究[J]. 采矿与安全工程学报，2013，30(1)：74–79.(HE Guicheng，LIU Yong，DING Dexin，et al. Strength characteristic of cemented waste rock backfills and its application[J]. Journal of Mining and Safety Engineering，2013，30(1)：74–79.(in Chinese))
[11] 由 希，任凤玉，何荣兴，等. 阶段空场嗣后充填胶结充填体抗压强度研究[J]. 采矿与安全工程学报，2017，34(1)：163–169.(YOU Xi，REN Fengyu，HE Rongxing，et al. Research on compressive strength of cemented filling body in subsequent filling at the stage of open stope[J]. Journal of Mining and Safety Engineering，2017，34(1)：163–169.(in Chinese))
[12] 刘玉龙，丁德馨，李广悦，等. 胶结充填体固化与开挖矿体垂直应力匹配特征[J]. 采矿与安全工程学报，2013，30(4)：526–530.(LIU Yulong，DING Dexin，LI Guangyue，et al. Match between the solidification of the cemented backfill and the vertical stress in the excavated ore body[J]. Journal of Mining and Safety Engineering，2013，30(4)：526–530.(in Chinese))
[13] 李长洪，魏晓明，张立新，等. 胶结充填体与矿石的能量匹配关系及固化时间的确定[J]. 采矿与安全工程学报，2017，34(6)：1 116–1 121.(LI Changhong，WEI Xiaoming，ZHANG Lixin，et al. Energy matching relationship between cemented backfill body and ore and determination of curing time[J]. Journal of Mining and Safety Engineering，2017，34(6)：1 116–1 121.(in Chinese))
[14] 刘志祥，李夕兵，赵国彦，等. 充填体与岩体三维能量耗损规律及合理匹配[J]. 岩石力学与工程学报，2010，29(2)：344–348.(LIU Zhixiang，LI Xibing，ZHAO Guoyan，et al. Three-dimensional energy dissipation laws and reasonable matches between backfill and rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(2)：344–348.(in Chinese))
[15] BRADY B H G，BROWN E T. 地下采矿岩石力学[M]. 3版. 佘诗刚，朱万成，赵 文，译. 北京：科学出版社，2010：384–405.(BRADY B H G，BROWN E T. Rock mechanics of underground mining[M]. 3rd ed. SHE Shigang，ZHU Wancheng，ZHAO Wen，ed. Beijing：Science Press，2010：384–405.(in Chinese))
[16] 李一帆，张建明，邓 飞，等. 深部采空区尾砂胶结充填体强度特性试验研究[J]. 岩土力学，2005，26(6)：865–868.(LI Yifan，ZHANG Jianming，DENG Fei，et al. Experimental study on strength characteristics of tailings cement backfilling at deep-seated mined-out area[J]. Rock and Soil Mechanics，2005，26(6)：865–868.(in Chinese))
[17] SIDOROFF F. Description of anisotropic damage application to elasticity[C]// Proceedings of IUTAM Colloquium on Physical Nonlinearities in Structural Analysis Berlin. [S. l.]：[s. n.]，1981：237–244.
[18] SWAN G，BOARD M. Fill-induced post-peak pillarstability[C]// Innovation in Mining Backfill Technology. Rotterdam：[s. n.]，1985：24–32.
[19] 刘龙琼，闵忠鹏，杨 准. 基于Marzars损伤模型的胶结充填体合理强度确定[J]. 黄金，2017，38(5)：39–42.(LIU Longqiong，MIN Zhongpeng，YANG Zhun. Determination of reasonable filling body strength based on Marzars damage model[J]. Gold，2017，38(5)：39–42.(in Chinese))
|
| [1] |
LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
|
|
|
|
2021, Vol. 40 
