露井联采回填区域地基注浆加固技术

doi:10.11799/ce202105014

摘要/Abstract

摘要： 为了消除露井联采回填区沉降及采空区突然垮塌对上方光伏基地地基稳定性造成的安全隐患，首先采用综合物探、钻探及钻孔电视等勘查方法，查清回填区赋存状况及深部采空区范围，然后设计采用浅部回填区注浆与深部采空区注浆相结合的地基整体加固方案，优化注浆物理力学参数和施工工艺，最后采用多种方法进行注浆加固效果检测。结果表明：采用单点地震法、地质雷达法和瞬变电磁法的综合物探勘查方法并布置钻探验证孔，可查清浅部回填区与深部空洞分布范围|浅部回填区采用1〖KG-*3〗∶〖KG-*3〗1为主的单液水泥浆，深部采空区采用1∶0.3∶0.9为主的水泥粉煤灰浆液，经过优化注浆物理力学参数和施工工艺，可以实现露井联采回填区和采空区的注浆加固|采用物探、钻孔取芯漏失液观测、波速测试以及地表沉降观测的方式进行注浆效果检测，实现浅部、深部注浆效果的全覆盖检测，通过检测得到回填区和采空区空洞、裂隙注浆效果良好，消除了光伏地基隐患。

关键词: 地基加固, 综合物探, 回填区注浆, 采空区注浆

Abstract: A photovoltaic base was built in an open-pit coal mine backfill area. Its booster station was located at the edge of the backfill area. There was a small kiln-pillar goaf under the eastern boundary of the booster station. During the operation of the booster station for 3 years, the backfill area had gradually subsided and tilted tower structures. Comprehensive geophysical surveys (ground geological radar, single-point seismic, and transient electromagnetic methods), drilling and drilling television surveys were conducted on the area to find out the backfill area status and the extent of deep goafs. Designed the overall reinforcement of the foundation by combining shallow grouting in the backfill area and deep grouting in the goaf.According to previous engineering practice, laboratory experiments, and field tests, it determined the slurry ratio and grouting parameters. After construction was completed, the geophysical comparison method before and after the treatment, the drilling core and fluid leakage observation method, the wave velocity test method, and the observation of surface settlement and deformation were used to analyze the treatment effect, and the grouting effect in the backfill area and the goaf area was good through inspection, which eliminated the hidden dangers of further subsidence of the booster station foundation and the sudden collapse of the goaf area, it provided a reference for similar projects.

中图分类号:

TD175

陈清通, 牟义, 陈凯. 露井联采回填区域地基注浆加固技术[J]. 煤炭工程, 2021, 53(5): 74-79.

参考文献 18

[1]	张永成.注浆技术[M].北京:煤炭工业出版社,2012.
[2]	陈清通.采空区注浆加固治理浆液流动规律研究[D].阜新：辽宁工程技术大学,2008.
[3]	孙庆先,张俊英,陈凯,等.大同采煤沉陷区光伏示范基地110kV汇集站浅部采空区注浆治理技术[J].中国矿业,2018,27(01):119-122. SUN Qingxian, ZHANG Junying, CHEN Kai,et al. Shallow goal grouting technology under 110 kV collecting station in photovoltaic demonstration base at Datong coal mine subsidence area[J]. China Mining Magazine, 2018,27(01):119-122.
[4]	陈凯,陈清通,孙庆先,等.大同采煤沉陷区光伏示范基地建设采空区注浆治理技术应用[J].煤矿安全,2018,49(08):169-172. CHEN Kai, CHEN Qingtong, SUN Qingxian, et al. Application of grouting treatment technology in goaf for photovoltaic demonstration base in Datong coal mining subsidence area[J]. Safety in Coal Mines, 2018, 49(08):169-172.
[5]	牟义,邱浩,牛超,等.多源干扰条件下瞬变电磁法电性响应规律研究[J].地球物理学进展,2019,34(06):2493-2502. MU Yi, QIU Hao, NIU Chao,et al. Study on the electrical response law of transient electromagnetic method under multi-source interference conditions[J]. Progress in Geophysics ( in Chinese), 2019, 34(06): 2493-2502.
[6]	牟义.浅埋采空区瞬变电磁法响应特征试验研究[J].煤炭科学技术,2018,46(10):203-208. MU Yi. Experimental study on response characteristics of transient electromagnetic method in shallow gob[J]. Coal Science and Technology,2018,46(10):203-208.
[7]	刘义新,张俊英,陈清通,等.大同采煤沉陷区建设光伏电站地基稳定性评估及治理技术[J].煤矿安全,2017,48(10):204-207. LIU Yixin, ZHANG Junying, CHEN Qingtong, et al. Foundation stability evaluation and goaf treatment of photovoltaic plant in coal mining subsidence area of Datong city[J]. Safety in Coal Mines,2017,48(10):204-207.
[8]	张俊英,李文,杨俊哲,等.神东矿区房采采空区安全隐患评估与治理技术[J].煤炭科学技术,2014,42(10):14-19. ZHANG Junying, LI Wen, YANG Junzhe, et al. Research on hazard assessment and control technology of room and pillar mining method goaf in Shendong mining area[J]. Coal Science and Technology, 2014,42(10):14-19.
[9]	王彦君.煤矿采空区场地注浆设计及治理效果检测分析[J].中国煤炭地质,2017,29(11):54-59. WANG Yanjun. Coalmine worked-out area site grouting design, governing effect detection and analysis[J]. Coal Geology of China,2017,29(11):54-59.
[10]	张俊英,王翰锋,张彬,等.煤矿采空区勘查与安全隐患综合治理技术[J].煤炭科学技术,2013,41(10):76-80. ZHANG Junying,WANG Hanfeng,ZHANG Bin,et al.Exploration of mining goaf and comprehensive control technology of safety hidden dangers[J]. Coal Science and Technology, 2013,41(10):76-80.
[11]	贾新果,孙春东.基于变形监测的采空区注浆加固治理效果评价[J].煤炭工程,2017,49(08):74-77,81. JIA Xinguo, SUN Chundong. Evaluation of goaf grouting reinforcement effect based on deformation monitoring[J]. Coal Engineering,2017,49(08):74-77,81.
[12]	张永超,贾新果,陈凯.瞬变电磁法探测超高水材料注浆治理采空区效果[J].煤炭科学技术,2017,45(03):174-178,100. ZHANG Yongchao, JIA Xinguo, CHEN Kai. TEM inspecting of goaf treatment effect with grouting super high water material[J]. Coal Science and Technology, 2017, 45( 3) : 174-178, 100.
[13]	甘志超.煤矿采空区注浆充填材料电阻率影响因素试验研究[J].煤矿开采,2016,21(04):87-89,141. GAN Zhichao. Experimental Studying of Resistivity Influence Factors of Grouting Filling Material in Goaf of Coal Mine[J]. Coal Mining Technolog,2016,21(04):87-89,141.
[14]	陈利生.基于FLAC3D的采空区注浆加固数值模拟研究[J].煤炭技术,2014,33(05):251-254. CHEN Lisheng. Numerical simulation for grouting reinforcement in goaf based on FLAC3D[J]. Coal Technology,2014,33(05):251-254.
[15]	董云飞.斜井井筒下伏采空区注浆治理设计与施工[J].煤炭工程,2013,45(05):48-50. DONG Yunfei. Design and Construction of Grouting Treatment in the Underground Goaf of Inclined Shaft[J]. Coal Engineering,2013,45(05):48-50.
[16]	李杰,贾新果,陈清通.浅埋厚煤层综放开采地表移动规律实测研究[J].煤炭科学技术,2012,40(04):108-110,115. LI Jie, JIA Xinguo, CHEN Qingtong. Study on surface ground displacement law measure of fully mechanized top coal caving mining in shallow depth thick seam[J]. Coal Science and Technology, 2012,40(04):108-110,115.
[17]	陈清通.考虑强度参数弱化非线性损伤本构模型研究[J].煤矿开采,2018,23(06):1-5,51. CHEN Qingtong. Nonlinear damage constitutive model based on weakening strength parameters[J]. Coal Mining Technology,2018,23(06):1-5,51.
[18]	牟义,李卫伟,高卫富.分布式高密度电法探测浅埋深采空区试验研究[J].煤炭工程,2019,51(09):152-157. MU Yi, LI Weiwei, GAO Weifu. Shallow-buried goaf detection test using high density resistivity method[J]. Coal Engineering,2019,51(09):152-157.