|
|
|
| Experimental study on physical properties of silica soil and grouting modified mudstone |
| CHAI Zhaoyun，LIU Xu，YANG Pan，GUO Ruiyu，YANG Zeqian，LIU Xiangyu |
| (Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
|
|
|
|
Abstract Based on the viscosity and gel time，wettability and affinity of silica sol，and it?s gel deformation and strength were characterized，an experimental system of steady pressure grouting was developed. The law of grouting permeability of silica sol in mudstone and the evolution law of strength，pore fracture and permeability of grouting modified mudstone were studied. The results show that after adding catalyst，the viscosity of silica sol increases composite exponentially with time，and the gel time is related to the content of SiO2 and Na2O of silica sol and the amount of catalyst，the smaller the content of SiO2 and Na2O and the amount of catalyst is，the longer the gel time is. There is a certain phenomenon of dry shrinkage after silica sol gel，and the smaller the humidity of the curing environment is，the more serious the dry shrinkage is. The stress-strain curve of gel is similar to that of rock materials，and there are stress drop in pre-peak and post-peak. With the extension of curing time，the strength of gel increases，and the brittleness characteristic becomes more and more obvious during failure. After grouting，the uniaxial compressive strength of rock samples decreases in varying degrees，and is negatively related to grouting pressure and time. Under the same conditions，the strength increases with the increase of SiO2 and Na2O content in silica sol. The failure mode changes from the shear splitting failure before grouting to the coexistence of shear slip failure，fracture failure and drum failure after grouting. The pore shape distribution of rock samples has little change before and after grouting，but the pore volume of pore size larger than 20 nm pore is smaller than that before grouting，and permeability decreased significantly.
|
|
|
|
|
|
| [1] 张 农，许兴亮，李桂臣. 巷道围岩裂隙演化规律及渗流灾害控制[J]. 岩石力学与工程学报，2009，28(2)：330–335.(ZHANG Nong，XU Xingliang，LI Guichen. Fissure-evolving laws of surrounding rock mass of roadway and control of seepage disasters[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(2)：330–335.(in Chinese))
[2] 张连震，刘人太，张庆松，等. 软弱地层劈裂–压密注浆加固效果定量计算方法研究[J]. 岩石力学与工程学报，2018，37(5)：1 169–1 184.(ZHANG Lianzhen，LIU Rentai，ZHANG Qingsong，et al. Calculation or reinforcement effect of fracturing-compaction grouting in soft strata[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(5)：1 169–1 184.(in Chinese))
[3] 张 聪，阳军生，谢亦朋，等. 富水岩溶越江质构隧道注浆材料试验与应用研究[J]. 岩石力学与工程学报，2018，37(9)：2 120–2 130. (ZHANG Cong，YANG Junsheng，XIE Yipeng，et al. Experiment and application for grouting materials for karst under conditions of underground water flow before shield tunneling[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(9)：2 120–2 130.(in Chinese))
[4] 蒋煌斌，张贵金，傅小姝，等. 全风化花岗岩地层可灌性浆材试验研究[J]. 铁道科学与工程学报，2018，15(10)：2 501–2 508.(JIANG Huangbin，ZHANG Guijin，FU Xiaoshu，et al. Experimental study on irrigated pulp of fully weathered granite[J]. Journal of Railway Science and Engineering，2018，15(10)：2 501–2 508.(in Chinese))
[5] 柴肇云，郭卫卫，陈维毅，等. 泥岩孔裂隙分布特征及其对吸水性的影响[J]. 煤炭学报，2012，37(增1)：75–80.(CHAI Zhaoyun，GUO Weiwei，CHEN Weiyi，et al. Distribution characteristics of mudstone pore-fracture and its influence on absorption[J]. Journal of China Coal Society，2012，37(Supp.1)：75–80.(in Chinese))
[6] BJ?NSTR?M J. Influence of nano-silica and organic admixtures on cement hydration：a mechanistic investigation[Ph. D. Thesis][D]. Goteborg，Sweden：Goteborg University，2005.
[7] JURINAK J，SUMMERS L，JURINAK J，et al. Oilfield applications of colloidal silica gel[J]. SPE Production Engineering，1991，6(4)：406–412.
[8] NOLL M，BARTLETT C，DOCHAT T. In-situ permeability reduction and chemical fixation using colloidal silica[C]// ASSOCIATION N G W. Sixth National Outdoor Action Conference on Aquifer Restoration，Ground Water Monitoring and Geophysical Methods. Las Vegas：[s. n.]，1992：443–457.
[9] SERIGHT R. Reduction of gas and water permeabilities using gels[J]. SPE Production and Facilities，1995，2(10)：103–108.
[10] AXELSSON M. Mechanical tests on a new non cementitious grout，silica sol：a laboratory study of the material characteristics[J]. Tunnelling and Underground Space Technology，2006，21(5)：554–560.
[11] 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. Permeation law and long-term solidification stability evaluation in loose coal with silica sol[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2018.(in Chinese))
[12] 杨仁树，薛华俊，郭东明，等. 基于注浆试验的深井软岩 CT 分析[J]. 煤炭学报，2016，41(2) ：345–351.(YANG Renshu，XUE Huajun，GUO Dongming，et al. Laboratory grouting experiment based CT analysis of grouted soft rocks in deep mines[J]. Journal of China Coal Society，2016，41(2)：345–351.(in Chinese))
[13] 张连震，李志鹏，张庆松，等. 砂层压密特性及其对劈裂–压密注浆扩散过程的影响[J]. 煤炭学报，2020，45(2)：667–675.(ZHANG Lianzhen，LI Zhipeng，ZHANG Qingsong，et al. Compaction behavior of sand layer and its effect on diffusion process of fracture-compaction grouting mode[J]. Journal of China Coal Society，2020，45(2)：667–675.(in Chinese))
[14] PAN D，ZHANG N，XIE Z，et al. Laboratory testing of silica sol grout in coal measure mudstones[J]. Materials，2016，9(11)：940
[15] PAN D，ZHANG N，HAN C，et al. Experimental study of imbibitions characteristics of silica sol in coal-measure mudstone matrix[J]. Applied Sciences，2017，7(3)：300.
[16] LIU B，SANG H，WANG Z，et al. Experimental study on the mechanical properties of rock fracture after grouting reinforcement[J]. Energies，2020，13(18)：4 814.
[17] LI Z，LIU H，DUN Z，et al. Grouting effect on rock fracture using shear and seepage assessment[J]. Construction and Building Materials. 2020，242：118 131.
[18] 郭 玉，张碧亮，郑西贵，等. 基于浆液流变参数时变性的超细水泥风氧化带注浆加固技术[J]. 采矿与安全工程学报，2019，36(2)：338–343.(GUO Yu，ZHANG Biliang，ZHENG Xigui，et al. Grouting reinforcement technology of superfine cement with wind oxidation zone based on time varying rheological parameters of slurries[J]. Journal of Mining and Safety Engineering，2019，36(2)：338–343.(in Chinese))
[19] 徐星华，杨嘉怡，杨韶昆. 超细水泥材料注浆加固深部极软厚煤层回采巷道试验研究[J]. 河南理工大学学报，2016，35(3)：329–337. (XU Xinghua，YANG Jiayi，YANG Shaokun. Experimental research of reinforcing stopping tunnel for extremely soft thick coal seam in deep by grouting of ultrafine cement materials[J]. Journal of Henan Polytechnic University：Natural Science，2016，35(3)：329–337.(in Chinese))
[20] 魏雪斐，段云岭，史小萌，等. 海下石油储库硫铝酸盐水泥注浆材料研究[J]. 岩石力学与工程学报，2019，38(增1)：3 045–3 052. (WEI Xuefei，DUAN Yunling，SHI Xiaomeng，et al. Study of under sea oil storage sulphoaluminate cement grouting material[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(Supp.1)：3 045–3 052.(in Chinese))
[21] 张海波，狄红丰，刘庆波，等. 微纳米无机注浆材料研发与应用[J]. 煤炭学报，2020，45(3)：949–955.(ZHANG Haibo，DI Hongfeng，LIU Qingbo，et al. Research and application of micro-nano inorganic grouting materials[J]．Journal of China Coal Society，2020，45(3)：949–955.(in Chinese))
[22] 郭启良，丁立丰，张志国，等. 压力洞室围岩的高压透水率测试技术与应用研究[J]. 岩石力学与工程学报，2005，24(2)：230–235.(GUO Qiliang，DING Lifeng，ZHANG Zhiguo，et al. Study of high pressure permeability measurements and applications for pressure tunnels[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(2)：230–235.(in Chinese))
|
|
|
|
2021, Vol. 40 
