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| Research and application of technology of water cutoff and slope reinforcement in open-pit mines in sandy gravel aquifer |
| HAN Longqiang1，WU Shunchuan1，2，GAO Yongtao2，WANG Guanghe3，WANG Huizhen3，
LIU Yang2，YAN Qiong4，ZHANG Huajin1 |
| (1. Faculty of Land Resources Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650093，China；
2. Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines，University of Science and Technology Beijing，Beijing 100083，China；3. Zhongkan Metallurgical Geotechnical Investigation Design and Research Institute Co.，Ltd.，Baoding，Baoding，Hebei 071069，China；4. Powerchina Roadbridge Group Co.，Ltd.，Beijing 100048，China) |
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Abstract To solve the technical problem of water cutoff and slope reinforcement in water-rich sandy gravel aquifer in the Tenglong iron mine，aiming at the complex conditions of the slope with high water pressure and low strength，the technology of large-scale underground diaphragm wall was first introduced into the water-management field in an open-pit mine. An arc-shaped underground diaphragm wall preventing water curtain with a length of nearly 1 152 m and a maximum depth of 50 m was built along the 39 m platform on the south side of the pit. The influence laws of structural parameters of the underground diaphragm wall such as the concrete strength grade，the thickness and location of the wall，and the depth of wall embedded into the bedrock，on the lateral displacement，stress state and bending moment of diaphragm wall were analyzed by numerical experiment，and it was found that the bending moment was more sensitive to the variation of parameters. The test index“anti-bending safety”was proposed and the orthogonal experiment was designed to optimize the structural parameters of the underground diaphragm wall. The combination of optimal parameters was proposed，with the concrete strength grade of C25，the thickness of the wall of 800 mm，the depth of the wall embedded into bedrock of 2–3 m and the location of 10 m away from the outer edge of the platform. According to the numerical calculation and field monitoring results，after constructing the underground diaphragm wall，the anti-bending strength and anti-shear strength of the diaphragm wall can satisfy the specification requirements. The drainage volume of the mine has been reduced by 97%，the slope stability has been significantly improved. The diaphragm wall has the double functions of soil retaining and water cutoff. The research results have successfully solved the major technical problems of slope excavation in the open-pit mine in water-rich sandy cobble ground，and it can provide a useful reference for anti-seepage engineering in similar open-pit mines.
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| [1] TOWN P. Controlling water ingress through diaphragm wall joints[J]. Geotechnical Special Publication，2012，228(2)：1 995–2 002．
[2] MENDEZ J A，RAUSCHE F，ASCE M. Quality control of diaphragm walls by crosshole sonic logging[J]. Geocongress，2012，227：650–663.
[3] PUJADES E，CARRERA J，VáZQUEZ-SU?é E，et al. Hydraulic characterization of diaphragm walls for cut and cover tunnelling[J]. Engineering geology，2012，125：1–10.
[4] EMILIOS M，MELLO C，GEORGIOS K，et al. Effects from diaphragm wall installation to surrounding soil and adjacent buildings[J]. Computers and Geotechnics，2013，53：106–121.
[5] 张 雁. 露天煤矿防渗墙截渗减排机制及工程应用研究[博士学位论文][D]. 北京：煤炭科学研究总院，2018.(ZHANG Yan. Study on the mechanism and engineering application of seepage cutoff and drainage reduction of diaphragm wall in open-pit coal mine[Ph. D. Thesis][D]. Beijing：CCTEG China Coal Research Institute，2018.(in Chinese))
[6] 赵 毅. 国外露天矿帷幕堵水及在我国的应用前景[J]. 露天采矿，1987，9(3)：24–30.(ZHAO Yi. Water blocking curtain in open-pit mines abroad and application prospect in China[J]. Opencast Mining Technology，1987，9(3)：24–30.(in Chinese))
[7] 黄文干. 露天矿疏干和堵水帷幕[J]. 煤矿设计，1984，(3)：33–36. (HUANG Wengan. Dewatering and water blocking curtain of open-pit coal mine[J]. Coal Engineering，1984，(3)：33–36.(in Chinese))
[8] 刘志华. 元宝山露天矿内排土场充水治理技术研究[硕士学位论文][D]. 辽宁：辽宁工程技术大学，2016.(LIU Zhihua. The study of water-filled treatment for Yuanbaoshan opencast dump[M. S. Thesis][D]. Liaoning：Liaoning Technical University，2016.(in Chinese))
[9] 刘 基，靳德武，姬亚东，等. 复杂水文地质条件下大型帷幕截流工程效果数值仿真分析[J]. 煤炭学报，2019，44(8)：2 427–2 436. (LIU Ji，JIN Dewu，JI Yadong，et al. Numerical simulation analysis of closure effect of large curtain work with complex hydrogeological conditions[J]. Journal of China Coal Society，2019，44(8)：2 427–2 436. (in Chinese))
[10] 邓学文，寿震宇. 新桥硫铁矿矶山东部边坡地下水的综合防治[J]. 金属矿山，1999，(12)：30–32.(DENG Xuewen，SHOU Zhenyu. Comprehensive control of the underground water in Jishan east slope Xingqiao sulfur iron mine[J]. Metal Mine，1999，(12)：30–32.(in Chinese))
[11] 吴大敏. 旋喷注浆在露天矿防治水工程中的应用[J]. 化工矿物与加工，1998，7(5)：3–5.(WU Damin. Application of rotary jet grouting in water control engineering of open-pit mine[J]. Industrial Minerals and Processing，1998，7(5)：3–5.(in Chinese))
[12] 王文景，李 琦，李国平，等. 高水头承压水防渗帷幕在姑山采场的应用[J]. 金属矿山，2009，(增1)：703–707.(WANG Wenjing，LI Qi，LI Guoping，et al. Application of high waterhead pressure water anti-seepage curtain in Gushan stope[J]. Metal Mine，2009，(Supp.1)：703–707.(in Chinese))
[13] 李 琦，王文景，郎佳红. 高压喷射防渗帷幕在马钢姑山采场的应用[J]. 煤炭技术，2007，26(9)：138–141.(LI Qi，WANG Wenjing，LANG Jiahong. Application of anti-seepage curtain by high pressure spray technology in Gushan mining[J]. Coal Technology，2007，26(9)：138–141.(in Chinese))
[14] 张 雁. 露天煤矿截渗减排新技术[J]. 露天采矿技术，2017，32(6)：45–47.(ZHANG Yan. New technology of cutting off seepage channel and reducing water drainage in open-pit coal mine[J]. Opencast Mining Technology，2017，32(6)：45–47.(in Chinese))
[15] 张 雁. 露天煤矿防渗墙构建条件与类型[J]. 煤炭技术，2019，38(7)：25–28.(ZHANG Yan. Construction conditions and types of diaphragm wall in open-pit coal mine[J]. Coal Technology，2019，38(7)：25–28.(in Chinese))
[16] 张 雁，黄选明，彭 巍，等. 截水帷幕在露天煤矿截渗减排中的应用[J]. 煤炭学报，2020，45(5)：1 865–1 873.(ZHANG Yan，HUANG Xuanming，PENG Wei，et al. Application of water cutoff curtain in the seepage cutoff and drainage reduction of open-pit coal mine[J]. Journal of China Coal Society，2020，45(5)：1 865–1 873. (in Chinese))
[17] 董纪涛. 菏泽某超大矿山水文地质发育规律及防突水研究[硕士学位论文][D]. 济南：山东大学，2010.(DONG Jitao. Study on hydrogeological pattern and prevention of water in a large mine of Heze[M. S. Thesis][D]. Jinan：Shandong University，2010.(in Chinese))
[18] 朱明诚，韩 强，赵贵斌，等. 卵砾石含水层高压旋喷注浆止水帷幕技术[J]. 煤田地质与勘探，2020，48(4)：74–79.(ZHU Mingcheng，HAN Qiang，ZHAO Guibin，et al. Technology of high pressure jet grouting water cutoff curtain in gravel aquifer[J]. Coal Geology and Exploration，2020，48(4)：74–79.(in Chinese))
[19] 陈鹏飞，龚晓南，刘念武. 止水帷幕的挡土作用对深基坑变形的影响[J]. 岩土工程学报，2014，36(增2)：254–258.(CHEN Pengfei，GONG Xiaonan，LIU Nianwu. Effect of curtain’s role in retaining on deformation of deep excavations[J]. Chinese Journal of Geotechnical Engineering，2014，36(Supp.2)：254–258.(in Chinese))
[20] 刘凤洲，谢雄耀. 地铁基坑围护结构成槽施工对邻近建筑物沉降影响及监测数据分析[J]. 岩石力学与工程学报，2014，33(增1)：2 901–2 907.(LIU Fengzhou，XIE Xiongyao. Effect of trench construction of retaining structure in metro foundation pit on adjacent building settlement and monitoring data analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：2 901–2 907. (in Chinese))
[21] 曾超峰，胡 义，薛秀丽. 不同施工条件下基坑预降水对地下连续墙侧移影响研究[J]. 岩土工程学报，2017，39(增2)：112–115. (ZENG Chaofeng，HU Yi，XUE Xiuli. Wall deflection induced by pre-excavation dewatering under different construction conditions[J]. Chinese Journal of Geotechnical Engineering，2017，39(Supp.2)：112–115.(in Chinese))
[22] 王新泉，崔允亮，张世民，等. 长江漫滩高承压水地基地下连续墙承载特性现场试验研究[J]. 岩石力学与工程学报，2017，36(3)：773–780.(WANG Xinquan，CUI Yunliang，ZHANG Shimin，et al. Field test on bearing characteristics of diaphragm walls under high water pressure at floodplain of Yangtze River[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(3)：773–780.(in Chinese))
[23] 陈保国，闫腾飞，王程鹏，等. 深基坑地下连续墙支护体系协调变形规律试验研究[J]. 岩土力学，2020，41(10)：3 289–3 299.(CHEN Baoguo，YAN Tengfei，WANG Chengpeng，et al. Experimental study on compatible deformation law of diaphragm wall support system for deep foundation pit[J]. Rock and Soil Mechanics，2020，41(10)：3 289–3 299.(in Chinese))
[24] 中华人民共和国行业标准编写组. JGJ 118—2011 冻土地区建筑地基基础设计规范[S]. 北京：中国建筑工业出版社，2011.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 118—2011Code for design of soil and foundation of building in frozen soil region[S]. Beijing：China Architecture and Building Press，2011.(in Chinese))
[25] 中华人民共和国行业标准编写组. JTG B02—2013公路工程抗震规范[S]. 北京：人民交通出版社，2013.(The Professional Standards Compilation Group of People?s Republic of China. JTG B02—2013 Specification of seismic design for highway engineering[S]. Beijing：China Communications Press，2013.(in Chinese))
[26] 贾晓风. 深基坑旋喷锚桩支护数值模拟与设计参数优化分析[硕士学位论文][D]. 邯郸：河北工程大学，2019.(JIA Xiaofeng. Numerical simulation and optimization analysis of design parameters for deep-base pit rotary spray anchor pile support[M. S. Thesis][D]. Handan：Hebei University of Engineering，2019.(in Chinese))
[27] 中华人民共和国国家标准编写组. GB 50010—2010混凝土结构设计规范[S]. 北京：中国建筑工业出版社，2015.(The National Standards Compilation Group of People?s Republic of China. GB 50010—2010 Code for design of concrete structures[S]. Beijing：China Architecture and Building Press，2015.(in Chinese))
[28] 中华人民共和国国家标准编写组. GB 51016—2014非煤露天矿边坡工程技术规范[S]. 北京：中国计划出版社，2014.(China Metallurgical Construction Association. GB 51016—2014 Technical code for non-coal open-pit mine slope engineering[S]. Beijing：China Planning Press，2014.(in Chinese)) |
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2022, Vol. 41 
