Self-imbibition grouting and argillaceous rock mass anti-seepage reinforcement with silica sol
ZHANG Nong1,2,3,4，XIANG Zhe1,2，PAN Dongjiang3,4
(1. State Key Laboratory of Coal Exploration and Intelligent Mining，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，
China；3. Research Institute of Rock Mass Modification and Reinforcement Materials，Xuzhou University of
Technology，Xuzhou，Jiangsu 221000，China；4. School of Civil Engineering，Xuzhou University of
Technology，Xuzhou，Jiangsu 221000，China)
Abstract：The mud of argillaceous soft rock is an important crux of long-term large deformation and instability of coal mine argillaceous rock mass roadways. Aiming at the poor injectability of cement slurry to micro-cracks in the rock mass during the mudstone grouting reinforcement process，which leads to poor anti-seepage and reinforcement effect，the feasibility of a new type of nano-silica sol grouting for the anti-seepage reinforcement of argillaceous rock mass was systematically studied. Based on the micelle structure of silica sol，the gel principle of silica sol is clarified，and the particle size grade of grouting silica sol is optimized. The basic physical and mechanical properties of silica sol and the basic anti-seepage characteristics of consolidated argillaceous soft rock are analyzed. The results show that silica sol has significant advantages over conventional grouting materials in terms of grout injectability，gel volume stability，and anti-seepage of the grouting structure. But the gel strength is less. The pore volume and permeability of argillaceous rock mass can be significantly reduced by silica sol grouting bonding，and the permeability coefficient can be reduced to 10－9 cm/s，which can meet the anti-seepage project of grouting argillaceous micro-cracked rock mass in coal mine roadways need. Aiming at the inefficiency of conventional silica sol grouting method for argillaceous rock mass matrix system grouting，based on the affinity between mudstone micro-cracks and silica sol，the grouting method of silica sol self-absorption infiltration grouting method for argillaceous rock mass was studied. The imbibition grouting of 0.1–40 mD low-permeability muddy core was realized，and the mechanism of imbibition grouting of silica sol was revealed from the microscopic scale. The results show that the grouting permeability of silica sol to low-permeability mudstone can be further improved by using the imbibition property. Aiming at the insufficient strength of silica sol-gel，a cross-scale composite modified slurry with silica sol as the main component and high injection height reinforcement was preliminarily developed by using aluminate cement as the modified reinforcing agent. The slurry material has outstanding performance in injectability，rheology，gel controllability，and stone body strength and volume stability，and can achieve dual functions of sealing and strengthening argillaceous rock mass.
[1] 张 农，李桂臣，许兴亮. 泥质巷道围岩控制理论与实践[M]. 徐州：中国矿业大学出版社，2011：14–19.(ZHANG Nong，LI Guichen，XU Xingliang. Theory and practice of surrounding rock control in muddy tunnels[M]. Xuzhou：China University of Mining and Technology Press，2011：14–19.(in Chinese))
[2] 刘特洪，林天健. 软岩工程设计理论与施工实践[M]. 北京：中国建筑工业出版社，2001：26–31.(LIU Tehong，LIN Tianjian. Design theory and construction practice of soft rock engineering[M]. Beijing：China Architecture and Building Press，2001：26–31.(in Chinese))
[3] 张 农，李桂臣，许兴亮. 顶板软弱夹层渗水泥化对巷道稳定性的影响[J]. 中国矿业大学学报，2009，38(6)：757–763. (ZHANG Nong，LI Guichen，XU Xingliang. The influence of cementation of weak interlayers in the roof on the stability of tunnels[J]. Journal of China University of Mining and Technology，2009，38(6)：757–763.(in Chinese))
[4] 王家臣. 软岩控制理论与应用[M]. 北京：冶金工业出版社，2011：68–73.(WANG Jiachen. Soft rock control theory and application[M]. Beijing：Metallurgical Industry Press，2011：68–73.(in Chinese))
[5] 何满潮. 软岩工程力学[M]. 北京：科学出版社，2002：17–23. (HE Manchao. Soft rock engineering mechanics[M]. Beijing：Science Press，2002：17–23.(in Chinese))
[6] 刘泉声，雷广峰，卢超波，等. 注浆加固对岩体裂隙力学性质影响的试验研究[J]. 岩石力学与工程学报，2017，36(增1)：3 140–3 147. (LIU Quansheng，LEI Guangfeng，LU Chaosheng，et al. Experimental study on the influence of grouting reinforcement on the mechanical properties of rock fractures[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.1)：3 140–3 147.(in Chinese))
[7] 孙长伦. 泥岩细观力学特性及其遇水弱化规律研究[硕士学位论文][D]. 徐州：中国矿业大学，2019.(SUN Changlun. Study on the microscopic mechanical properties of mudstone and its weakening law in contact with water[M. S. Thesis][D]. Xuzhou：China University of Mining and Technology，2019.(in Chinese))
[8] 张雷鸣. 泥岩裂隙演化及注浆浆液失水渗流特性研究[硕士学位论文] [D]. 徐州：中国矿业大学，2022.(ZHANG Leiming. Research on the evolution of mudstone fractures and the characteristics of water loss and seepage of grouting slurry[M. S. Thesis][D]. Xuzhou：China University of Mining and Technology，2022.(in Chinese))
[9] 张成浩. 基于煤系泥岩孔裂隙三维表征的纳米型浆液扩散规律研究[硕士学位论文][D]. 徐州：中国矿业大学，2019.(ZHANG Chenghao. Study on diffusion law of nano slurry based on three-dimensional characterization of pores and fissures in coal measure mudstone[M. S. Thesis][D]. Xuzhou：China University of Mining and Technology，2019.(in Chinese))
[10] KUTZNER C. Grouting of rock and soil[M]. Balkema：Rotterdam，1996：146–149.
[11] 刘灿平. 改性硅溶胶灌浆材料的研发及其砂土灌浆模拟[硕士学位论文][D]. 天津：天津大学，2018.(LIU Canping. Development of modified silica sol grouting material and its sand grouting simulation[M. S. Thesis][D]. Tianjin：Tianjin University，2018.(in Chinese))
[12] JURINAK J J，SUMMERS L E，JURINAK J J，et al. Oilfield applications of colloidal silica gel[J]. SPE Production Engineering，1991，6(4)：406–412.
[13] NOLL M，BARTLETT C，DOCHAT T. In-situ permeability reduction and chemical fixation using colloidal silica[C]// Proceedings of the Sixth National Outdoor Action Conference On Aquifer Restoration，Ground Water Monitoring And Geophysical Methods. Las Vegas：[s. n.]，1992：443–457.
[14] BUTRÓN C，GUSTAFSON G，FRANSSON Å，et al. Drip sealing of tunnels in hard rock：A new concept for the design and evaluation of permeation grouting[J]. Tunnelling and Underground Space Technology，2010，25(2)：114–121.
[15] 汪青仓，李虎民，朱南京. 纳米级注浆材料及高性能混凝土斜井堵水应用研究[J]. 煤矿开采，2013，12(2)：97–98. (WANG Qingcang，LI Humin，ZHU Nanjing. Application of nano grouting material and high performance concrete for water shutoff in inclined shaft[J]. Coal Mining，2013，18(2)：97–98.(in Chinese))
[16] KOBAYASHI S，SOYA M，TAKEUCHI N，et al. Rock grouting and durability experiments of colloidal silica at Kurashiki underground LPG storage base[C]// Proceedings of the 2014 ISRM European Rock Mechanics Symposium. Vigo：[s. n.]，2014：1 027–1 032.
[17] PAGANO A G，EL MOUNTASSIR G，LUNN R J. Performance of colloidal silica grout at elevated temperatures and pressures for cement fracture sealing at depth[J]. Journal of Petroleum Science and Engineering，2022，208：109782.
[18] LEROY P，DEVAU N，REVIL A，et al. Influence of surface conductivity on the apparent zeta potential of amorphous silica nanoparticles[J]. Journal of Colloid and Interface Science，2013，410：81–93.
[19] SVERJENSKY D. Prediction of surface charge on oxides in salt solutions：revisions for 1：1 (M+L−) electrolytes[J]. Geochimica Et Cosmochimica Acta，2005，69(2)：225–257.
[20] 杨丽静，田辉平，龙 军，等. 碱性硅溶胶稳定性的研究[J]. 石油炼制与化工，2010，41(6)：12–16. (YANG Lijing，TIAN Huiping，LONG Jun，et al. Study on the stability of alkaline silica sol[J]. Petroleum Processing and Petrochemicals，2010，41(6)：12–16. (in Chinese))
[21] METIN C O，BONNECAZE R T，LAKE L W，et al. Aggregation kinetics and shear rheology of aqueous silica suspensions[J]. Applied Nanoscience，2014，4(2)：169–178.
[22] HOLTTA P，LAHTINEN M，HAKANEN M，et al. The influence of groundwater on the stability of silica colloids[J]. Journal of Materials Research，2009，1193：437.
[23] XIANG Z，ZHANG N，ZHAO Y，et al. Experiment on the silica sol imbibition of low-permeability rock mass：With silica sol particle sizes and rock permeability considered[J]. International Journal of Mining Science and Technology，2022，32(5)：1 009–1 019.
[24] PAN D，HONG K，FU H，et al. Influence characteristics and mechanism of fragmental size of broken coal mass on the injection regularity of silica sol grouting[J]. Construction and Building Materials，2021，269：121251.
[25] PAN D，ZHANG N，XIE Z Z，et al. Laboratory testing of silica sol grout in coal measure mudstones[J]. Materials，2016，9(11)：940.
[26] XIANG Z，ZHANG N，PAN D J，et al. Basic consolidation and impermeability laws for nano-silica-sol grouted mudstone[J]. Construction and Building Materials，2023，403：133121.
[27] 潘东江. 松散煤体的硅溶胶注浆渗透规律及长期固结稳定性研究[博士学位论文][D]. 徐州：中国矿业大学，2018.(PAN Dongjiang. Study on permeability law of silica sol grouting and long-term consolidation stability of loose coal[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2018.(in Chinese))
[28] PAN D，ZHANG N，ZHANG C，et al. Long-term mechanical behavior of Nano silica sol grouting[J]. Nanomaterials(Basel)，2018，8(1)：1–14.
[29] 孙晓彤，周宏伟，薛东杰，等. 基于NMR的低渗煤体自渗吸实验研究[J]. 中国矿业大学学报，2021，50(4)：804–812.(SUN Xiaotong，ZHOU Hongwei，XUE Dongjie，et al. Experimental study of spontaneous imbibition of low-permeability coal based on NMR[J]. Journal of China University of Mining and Technology，2021，50(4)：804–812.(in Chinese))
[30] GUO F，XIE Z Z，ZHANG N，et al. Study on the Pore-throat structure characterization and nano grouting law of the Low-permeability mudstone based on NMR-RSM methods[J]. Construction and Building Materials，2022，342：127913.
[31] 项 哲，张 农，赵一鸣，等. 基于NMR的低渗岩体硅溶胶吸渗注浆实验研究[J]. 岩石力学与工程学报，2022，41(10)：2 004–2 014. (XIANG Zhe，ZHANG Nong，ZHAO Yiming，et al. Experimental study on low permeability rock mass silica sol suction grouting based on NMR [J]. Journal of Rock Mechanics and Engineering，2022，41(10)：2 004–2 014.(in Chinese)
[32] 项 哲. 泥质软岩硅溶胶注浆固结规律及复合改性防渗加固机理研究[博士学位论文][D]. 徐州：中国矿业大学，2023. (XIANG Zhe. Research on the consolidation law of silica sol grouting in muddy soft rock and the mechanism of composite modified anti-seepage reinforcement [Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2023.(in Chinese))
[33] XIANG Z，ZHANG N，PAN D J，et al. Development and performance characterization of a composite grouting material suitable for sealing and reinforcement of microcracked mudstone[J]. Journal of Materials Research and Technology，2023，26：3 726–3 743.
[34] 王 鑫. 碳纳米管增强的纳米硅溶胶渗透加固砂土的试验研究[硕士学位论文][D]. 杭州：浙江科技学院，2019.(WANG Xin. Experimental study on carbon nanotube reinforced nano silica sol infiltration reinforcement of sandy soil[M. S. Thesis][D]. Hangzhou：Zhejiang University of Science and Technology，2019.(in Chinese))
2024, Vol. 43 
