厚表土井筒修复内套钢板混凝土井壁技术研究
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摘要
为解决由突水溃砂引起的厚表土地层井筒破损问题,针对其竖向压裂、法兰盘拉开及井筒偏斜等破坏特征,提出钢筋混凝土井壁与内套钢板(钢纤维)混凝土井壁结构相结合的全深套壁修复加固方案。以淮南矿区某在建煤矿副井为工程背景,结合现场井壁破坏形式及突水溃砂机理,提出井筒套壁设计原则和结构形式;根据现场井筒变形情况和相关规范计算得出套壁厚度以及钢板、混凝土应力;通过分析计算结果并结合现场实际,制定套壁施工方案;采用振弦传感器法对修复后内套井壁壁间压力、环向钢筋应力和变形进行监测,并长期观测检查孔水位。研究结果表明:①按组合筒公式计算得出,内套钢板(钢纤维)混凝土复合井壁结构钢板应力范围为187.6～292.0 MPa,混凝土应力范围为32.8～51.0 MPa,均满足设计要求;②施工完成后,壁间压力和环向钢筋应力监测最大值分别为3.2MPa和113.4 MPa,均处于安全范围内;③修复后井筒涌水量约为4 m~3/d,内套钢板混凝土复合井壁结构防水效果突出,井筒结构安全稳定;④在累深315.0～567.7 m段,井筒多处破损,以偏斜破坏为主,最大偏斜值达1 154 mm,在严重偏斜段,沿竖向采用分模、随偏、微调方式施工内套井壁,解决各模钢板接茬过渡施工难点。该方案利用单层内钢板(钢纤维)混凝土复合井壁结构其自身强度高、防水性能好等优点,不仅大幅减少内套井壁厚度,且保证修复后井筒的安全稳定运行。
In order to solve the damage question of shaft in thick topsoil caused by water inrush and sand burst,in view of its failure characteristics such as vertical fracturing,flange opening and wellbore deflection,adopting the repair and reinforcement scheme of full deep casing wall,which combines reinforced concrete shaft wall with inner sleeve steel plate( steel fiber) concrete shaft wall structure.Taking auxiliary shaft of a coal mine under construction in huainan mining area as the engineering background,combining with the failure form of wellbore and the mechanism of water inrush and sand burst,the design principle and structure form of wellbore sleeve are put forward; the thickness of sleeve wall and the stress of steel plate and concrete are calculated according to the deformation of wellbore in situ and relevant codes; by analyzing the calculation results and combining with the actual situation in the field,the sleeve wall construction scheme is formulated; vibration string sensor method is used to monitor the wall pressure,circumferential reinforcement stress and deformation of the repaired inner sleeve,and observing the water level of the inspection hole for a long time.The results show that,①according to the formula of composite tube,the stress range of steel plate( steel fiber) concrete composite shaft lining structure steel plate is 187.6 ～ 292.0 MPa,and that of concrete is 32.8 ～ 51.0 MPa,which all meet the design requirements; ② after completion of construction,the maximum monitoring values of wall pressure and circumferential reinforcement stress are 3.2 MPa and 113.4 MPa respectively,which are within the safe range; ③after repairing,the wellbore water inflow is about 4 m3/d,the waterproof effect of the inner steel plate concrete composite wellbore structure is outstanding,and the wellbore structure is safe and stable; ④ in the 315.0 ～ 567.7 m deep section,the borehole is damaged in many places,mainly by deflection,the maximum deflection value is 1 154 mm,in the severe deflection section,the inner sleeve wall is constructed vertically by mode division,deflection following and fine-tuning,so as to solve the difficulties of the transition construction of each model steel plate stubble connection. The scheme utilizes the advantages of single-layer inner steel plate( steel fiber)concrete composite shaft lining structure,such as high strength and good waterproofing performance,not only greatly reduces the thickness of inner sleeve shaft lining,but also ensures the safe and stable operation of repaired shaft lining.
In order to solve the damage question of shaft in thick topsoil caused by water inrush and sand burst,in view of its failure characteristics such as vertical fracturing,flange opening and wellbore deflection,adopting the repair and reinforcement scheme of full deep casing wall,which combines reinforced concrete shaft wall with inner sleeve steel plate( steel fiber) concrete shaft wall structure.Taking auxiliary shaft of a coal mine under construction in huainan mining area as the engineering background,combining with the failure form of wellbore and the mechanism of water inrush and sand burst,the design principle and structure form of wellbore sleeve are put forward; the thickness of sleeve wall and the stress of steel plate and concrete are calculated according to the deformation of wellbore in situ and relevant codes; by analyzing the calculation results and combining with the actual situation in the field,the sleeve wall construction scheme is formulated; vibration string sensor method is used to monitor the wall pressure,circumferential reinforcement stress and deformation of the repaired inner sleeve,and observing the water level of the inspection hole for a long time.The results show that,①according to the formula of composite tube,the stress range of steel plate( steel fiber) concrete composite shaft lining structure steel plate is 187.6 ～ 292.0 MPa,and that of concrete is 32.8 ～ 51.0 MPa,which all meet the design requirements; ② after completion of construction,the maximum monitoring values of wall pressure and circumferential reinforcement stress are 3.2 MPa and 113.4 MPa respectively,which are within the safe range; ③after repairing,the wellbore water inflow is about 4 m3/d,the waterproof effect of the inner steel plate concrete composite wellbore structure is outstanding,and the wellbore structure is safe and stable; ④ in the 315.0 ～ 567.7 m deep section,the borehole is damaged in many places,mainly by deflection,the maximum deflection value is 1 154 mm,in the severe deflection section,the inner sleeve wall is constructed vertically by mode division,deflection following and fine-tuning,so as to solve the difficulties of the transition construction of each model steel plate stubble connection. The scheme utilizes the advantages of single-layer inner steel plate( steel fiber)concrete composite shaft lining structure,such as high strength and good waterproofing performance,not only greatly reduces the thickness of inner sleeve shaft lining,but also ensures the safe and stable operation of repaired shaft lining.
引文
[1]姚直书,程桦,居宪博.深厚冲积层井筒修复内层钢板高强钢纤维混凝土复合井壁研究及应用[J].煤炭学报,2017,42(9):2295-2301.YAO Zhishu,CHENG Hua,JU Xianbo.Research and application of high strength steel fiber concrete compound shaft lining with inner steel plate in deep alluvium shaft repair[J].Journal of China Coal Society,2017,42(9):2295-2301.
[2]KANG Hongpu.Support technologies for deep and complex roadways in underground coal mines:a review[J].International Journal of Coal Science&Technology,2014,1(3):261-277.
[3]居宪博,方运买.立井钻井段钢板混凝土井壁破坏原因与修复方法[J].建井技术,2015,36(6):13-16.JU Xianbo,FANG Yunmai.Failure causes and repair method of steel plate concrete shaft liner in full face drilling section of mine shaft[J].Mine Construction Technology,2015,36(6):13-16.
[4]马江淮,严家平,张海涛.板集煤矿副井井筒地面注浆堵水技术与效果评价[J].煤矿安全,2011,16(4):45-47.MA Jianghuai,YAN Jiaping,ZHANG Haitao.Grouting and water blocking technology and its effect evaluation in mine shaft of auxiliary shaft of Banji Coal Mine[J].Safety in Coal Mines,2011,16(4):45-47.
[5]姚直书,程桦,荣传新.深冻结井筒内层钢板高强钢筋混凝土复合井壁试验研究[J].岩石力学与工程学报,2008,27(1):153-160.YAO Zhishu,CHENG Hua,RONG Chuanxin.Experimental study on composite shaft lining of inner steel plate cylinder and high strength reinforced concrete in deep frozen shaft[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(1):153-160.
[6]姚直书,程桦,孙文若.深厚表土层中高强复合井壁结构的试验研究[J].岩土力学,2003,24(5):739-743.YAO Zhishu,CHENG Hua,SUN Wenruo.Experimental study on high strength composite shaft lining in deep alluvium[J].Rock and Soil Mechanics,2003,24(5):739-743.
[7]洪伯潜.约束混凝土结构在井筒支护中的研究与应用[J].煤炭学报,2000,25(2):150-154.HONG Boqian.The research and application of confined concrete structure in shaft lining[J].Journal of China Coal Society,2000,25(2):150-154.
[8]LINK H,LVTGENDOR H O,STOSS K.不稳定岩的井壁设计原则[M].赵国华译.北京:煤炭工业出版社,1980.
[9]彭世龙,荣传新,程桦.潘三煤矿西风井井壁突水机理分析[J].广西大学学报:自然科学版,2015,40(4):1038-1043.PENG Shilong,RONG Chuanxin,CHENG Hua.Mechanism analysis of water inrush in west ventilation shaft lining at Pansan coal mine[J].Journal of Guangxi University:Natural Science Edition,2015,40(4):1038-1043.
[10]赵治泉.冻结井壁设计的历史回顾和展望[M].北京:煤炭工业出版社,1995,P5-10.
[11]刘志强,王博,杜健民,等.新型单平台凿井井架在深大立井井筒施工中的应用[J].煤炭科学技术,2017,45(10):24-29.LIU Zhiqiang,WANG Bo,DU Jianmin,et al.New mine shaft sinking headframe with single platform applied toconstruction of deep and large diameter mine shaft[J].Coal Science and Technology,2017,45(10):24-29.
[12]程桦,苏俊,姚直书.疏水沉降地层竖向可缩性井壁附加力分布规律研究[J].岩土力学,2007,28(3):471-475.CHENG Hua,SHU Jun,YAO Zishu.Study on distributing rule of additional force of compressible shaft wall in hydrophobic settlement stratum[J].Rock and Soil Mechanics,2007,28(3):471-475.
[13]姚直书,薛维培,陈廷学.深厚冲积层钻井井壁渗漏水机理和注浆技术探讨[J].煤炭科学技术,2015,43(S1):1-4.YAO Zhishu,XUE Weipei,CHEN Tingxue.Discussion on mechanism of water leakage and grouting technology of drilling shaft lining in deep alluvium[J].Coal Science and Technology,2015,43(S1):1-4.
[14]程志彬,张步俊,陈章庆.深厚软岩地层冻结关键技术[J].煤炭科学技术,2017,45(8):98-102,152.CHENG Zhibin,ZHANG Bujun,CHEN Zhangqing.Key technology of deep thick soft rock stratum freezing[J].Coal Science and Technology,2017,45(8):98-102,152.
[15]姚直书,程桦,宋海清.特厚冲积层钻井井壁高强高性能混凝土配制研究及其应用[J].中国矿业,2007,16(3):77-79.YAO Zhishu,CHENG Hua,SONG Haiqing.Preparation and application of high strength and high performance concrete of drilling shaft lining in special deep alluvium[J].China Mining Magazine,2007,16(3):77-79.
[16]蒋林华,徐辉东,储洪强,等.冻结法施工井壁中高强高性能混凝土研制应用[J].煤炭科学技术,2010,38(10):38-41,51.JIANG Linhua,XU Huidong,CHU Hongqiang,et al.Development and application of high strength and high performance concrete to mine freezing shaft[J].Coal Science and Technology,2010,38(10):38-41,51.
[17]王谦,朱锋,鲁统卫.高强高性能钢纤维混凝土在龙固煤矿冻结井筒筑壁施工中的应用研究[J].建井技术,2014,35(5):42-45.WANG Qian,ZHU Feng,LU Tongwei.Study on high strength and high performance steel fiber concrete applied to lining construction of mine freezing shaft in longgu mine[J].Mine Construction Technology,2014,35(5):42-45.
[18]姚直书.巨厚冲积层钢筋钢纤维高强混凝土井壁试验研究[J].岩石力学与工程学报,2005,24(7):1253-1258.YAO Zhishu.An experimental study on steel fiber reinforced high strength concrete shaft lining in deep alluvium[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1253-1258.
[19]杨龙,徐进,薛维培.CF80高强钢纤维井壁混凝土力学特性研究[J].煤矿安全,2018,49(12):59-63.YANG Long,XU Jin,XUE Weipei.Study on mechanical properties of CF 80 high strength steel fiber shaft lining concrete[J].Safety in Coal Mines,2018,49(12):59-63.
[20]齐善忠,杨维好.内钢板高强钢纤维混凝土井壁力学特性研究[J].煤炭工程,2016,48(3):103-105,109.QI Shanzhong,YANG Weihao.Study of mechanical characteristics of high-strength steel fiber reinforced concrete shaft lining with inner steel plate[J].Coal Engineering,2016,48(3):103-105,109.
[21]姚直书,程桦,杨俊杰.深表土中高强钢筋混凝土井壁力学性能的试验研究[J].煤炭学报,2004,29(2):167-171.YAO Zhishu,CHENG Hua,YANG Junjie.The experimental study on high strength reinforced concrete shift lining in deep alluvium[J].Journal of China Coal Society,2004,29(2):167-171.
[2]KANG Hongpu.Support technologies for deep and complex roadways in underground coal mines:a review[J].International Journal of Coal Science&Technology,2014,1(3):261-277.
[3]居宪博,方运买.立井钻井段钢板混凝土井壁破坏原因与修复方法[J].建井技术,2015,36(6):13-16.JU Xianbo,FANG Yunmai.Failure causes and repair method of steel plate concrete shaft liner in full face drilling section of mine shaft[J].Mine Construction Technology,2015,36(6):13-16.
[4]马江淮,严家平,张海涛.板集煤矿副井井筒地面注浆堵水技术与效果评价[J].煤矿安全,2011,16(4):45-47.MA Jianghuai,YAN Jiaping,ZHANG Haitao.Grouting and water blocking technology and its effect evaluation in mine shaft of auxiliary shaft of Banji Coal Mine[J].Safety in Coal Mines,2011,16(4):45-47.
[5]姚直书,程桦,荣传新.深冻结井筒内层钢板高强钢筋混凝土复合井壁试验研究[J].岩石力学与工程学报,2008,27(1):153-160.YAO Zhishu,CHENG Hua,RONG Chuanxin.Experimental study on composite shaft lining of inner steel plate cylinder and high strength reinforced concrete in deep frozen shaft[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(1):153-160.
[6]姚直书,程桦,孙文若.深厚表土层中高强复合井壁结构的试验研究[J].岩土力学,2003,24(5):739-743.YAO Zhishu,CHENG Hua,SUN Wenruo.Experimental study on high strength composite shaft lining in deep alluvium[J].Rock and Soil Mechanics,2003,24(5):739-743.
[7]洪伯潜.约束混凝土结构在井筒支护中的研究与应用[J].煤炭学报,2000,25(2):150-154.HONG Boqian.The research and application of confined concrete structure in shaft lining[J].Journal of China Coal Society,2000,25(2):150-154.
[8]LINK H,LVTGENDOR H O,STOSS K.不稳定岩的井壁设计原则[M].赵国华译.北京:煤炭工业出版社,1980.
[9]彭世龙,荣传新,程桦.潘三煤矿西风井井壁突水机理分析[J].广西大学学报:自然科学版,2015,40(4):1038-1043.PENG Shilong,RONG Chuanxin,CHENG Hua.Mechanism analysis of water inrush in west ventilation shaft lining at Pansan coal mine[J].Journal of Guangxi University:Natural Science Edition,2015,40(4):1038-1043.
[10]赵治泉.冻结井壁设计的历史回顾和展望[M].北京:煤炭工业出版社,1995,P5-10.
[11]刘志强,王博,杜健民,等.新型单平台凿井井架在深大立井井筒施工中的应用[J].煤炭科学技术,2017,45(10):24-29.LIU Zhiqiang,WANG Bo,DU Jianmin,et al.New mine shaft sinking headframe with single platform applied toconstruction of deep and large diameter mine shaft[J].Coal Science and Technology,2017,45(10):24-29.
[12]程桦,苏俊,姚直书.疏水沉降地层竖向可缩性井壁附加力分布规律研究[J].岩土力学,2007,28(3):471-475.CHENG Hua,SHU Jun,YAO Zishu.Study on distributing rule of additional force of compressible shaft wall in hydrophobic settlement stratum[J].Rock and Soil Mechanics,2007,28(3):471-475.
[13]姚直书,薛维培,陈廷学.深厚冲积层钻井井壁渗漏水机理和注浆技术探讨[J].煤炭科学技术,2015,43(S1):1-4.YAO Zhishu,XUE Weipei,CHEN Tingxue.Discussion on mechanism of water leakage and grouting technology of drilling shaft lining in deep alluvium[J].Coal Science and Technology,2015,43(S1):1-4.
[14]程志彬,张步俊,陈章庆.深厚软岩地层冻结关键技术[J].煤炭科学技术,2017,45(8):98-102,152.CHENG Zhibin,ZHANG Bujun,CHEN Zhangqing.Key technology of deep thick soft rock stratum freezing[J].Coal Science and Technology,2017,45(8):98-102,152.
[15]姚直书,程桦,宋海清.特厚冲积层钻井井壁高强高性能混凝土配制研究及其应用[J].中国矿业,2007,16(3):77-79.YAO Zhishu,CHENG Hua,SONG Haiqing.Preparation and application of high strength and high performance concrete of drilling shaft lining in special deep alluvium[J].China Mining Magazine,2007,16(3):77-79.
[16]蒋林华,徐辉东,储洪强,等.冻结法施工井壁中高强高性能混凝土研制应用[J].煤炭科学技术,2010,38(10):38-41,51.JIANG Linhua,XU Huidong,CHU Hongqiang,et al.Development and application of high strength and high performance concrete to mine freezing shaft[J].Coal Science and Technology,2010,38(10):38-41,51.
[17]王谦,朱锋,鲁统卫.高强高性能钢纤维混凝土在龙固煤矿冻结井筒筑壁施工中的应用研究[J].建井技术,2014,35(5):42-45.WANG Qian,ZHU Feng,LU Tongwei.Study on high strength and high performance steel fiber concrete applied to lining construction of mine freezing shaft in longgu mine[J].Mine Construction Technology,2014,35(5):42-45.
[18]姚直书.巨厚冲积层钢筋钢纤维高强混凝土井壁试验研究[J].岩石力学与工程学报,2005,24(7):1253-1258.YAO Zhishu.An experimental study on steel fiber reinforced high strength concrete shaft lining in deep alluvium[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1253-1258.
[19]杨龙,徐进,薛维培.CF80高强钢纤维井壁混凝土力学特性研究[J].煤矿安全,2018,49(12):59-63.YANG Long,XU Jin,XUE Weipei.Study on mechanical properties of CF 80 high strength steel fiber shaft lining concrete[J].Safety in Coal Mines,2018,49(12):59-63.
[20]齐善忠,杨维好.内钢板高强钢纤维混凝土井壁力学特性研究[J].煤炭工程,2016,48(3):103-105,109.QI Shanzhong,YANG Weihao.Study of mechanical characteristics of high-strength steel fiber reinforced concrete shaft lining with inner steel plate[J].Coal Engineering,2016,48(3):103-105,109.
[21]姚直书,程桦,杨俊杰.深表土中高强钢筋混凝土井壁力学性能的试验研究[J].煤炭学报,2004,29(2):167-171.YAO Zhishu,CHENG Hua,YANG Junjie.The experimental study on high strength reinforced concrete shift lining in deep alluvium[J].Journal of China Coal Society,2004,29(2):167-171.