恒源煤矿井筒非采动破坏判据的弹性力学分析
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摘要
以恒源煤矿为例,根据煤矿新生界含隔水层的多层沉积特征及弹性力学理论,给出各含、隔水层的位移函数,运用变分法得出松散层底含释水时,各层下沉时作用在井筒上的摩阻力解析解。在此基础上,利用摩尔-库伦强度理论对立井井筒进行强度校核,得出立井井筒的非采动破坏的临界水头降深值。研究结果表明,恒源煤矿井筒发生非采动破坏时的极限附加荷载为0.68 MPa,即临界水头降为68 m,计算结果与矿井实际情况较为吻合。
Taking Hengyuan Coal Mine as an example, according to the sedimentary characteristics of Cenozoic water-bearing and water-resisting layer and the theory of elastic mechanics, we give the displacement function of each aquifer and water-resisting layer. The analytical solution of frictional resistance acting on shaft lining during the sinking of each layer is got by using the variational method when the floor of unconsolidated layers contains or releases water. On this basis, the Mohr-Coulomb shear failure theory is used to analyze the strength of shaft lining. The critical waterhead fall of non-mining fracturing of shaft lining is got. The ultimate additional load is 0.68 MPa when the shaft lining of Hengyuan Coal Mine occurrs non-lining fracturing and the drop of head is 68 m. The calculation results obtained from formula agree well with the actual condition of mines.
Taking Hengyuan Coal Mine as an example, according to the sedimentary characteristics of Cenozoic water-bearing and water-resisting layer and the theory of elastic mechanics, we give the displacement function of each aquifer and water-resisting layer. The analytical solution of frictional resistance acting on shaft lining during the sinking of each layer is got by using the variational method when the floor of unconsolidated layers contains or releases water. On this basis, the Mohr-Coulomb shear failure theory is used to analyze the strength of shaft lining. The critical waterhead fall of non-mining fracturing of shaft lining is got. The ultimate additional load is 0.68 MPa when the shaft lining of Hengyuan Coal Mine occurrs non-lining fracturing and the drop of head is 68 m. The calculation results obtained from formula agree well with the actual condition of mines.
引文
[1]李文平.深厚表土中煤矿立井破裂工程地质研究[M].徐州:中国矿业大学出版社,2000.
[2]刘环宇.兖州矿区立井井筒非采动破裂的非线性预测与判别方法[J].工程地质学报,2005,13(2):231.
[3]刘环宇.厚冲积层立井井筒破坏的发生机理及防治技术研究[D].南京:河海大学,2005.
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[6]张印.深厚表土层中的井壁破裂与治理[J].青岛建筑工程学院学报,2001,22(2):10-12.
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[10]刘全林.混凝土井壁竖向极限承载能力计算的研究[J].煤炭学报,1995(6):583-587.
[11]骆念海.井壁竖直附加力的影响因素分析[J].煤炭科学技术,2000,28(12):41-43.
[12]马时先.桩身负摩阻力的现场测试与研究[J].岩土力学,1997,18(1):8-15.
[2]刘环宇.兖州矿区立井井筒非采动破裂的非线性预测与判别方法[J].工程地质学报,2005,13(2):231.
[3]刘环宇.厚冲积层立井井筒破坏的发生机理及防治技术研究[D].南京:河海大学,2005.
[4]沈珠江.理论土力学[M].北京:中国水利水电出版社,2000:114-115.
[5]楼根达.冲击层疏水沉降时的井壁受力分析[J].煤炭学报,1991,16(4):54-62.
[6]张印.深厚表土层中的井壁破裂与治理[J].青岛建筑工程学院学报,2001,22(2):10-12.
[7]蒋斌松.立井井壁的计算理论[J].岩石力学与工程学报,2003,22(增1):2183-2186.
[8]施凤英.负摩阻力计算及对桩承载力的影响[J].化工矿山技术,1996,25(6):49-52.
[9]姚直书.地层沉降时破裂井壁治理方法的探讨[J].东北煤炭技术,1995(6):16-20.
[10]刘全林.混凝土井壁竖向极限承载能力计算的研究[J].煤炭学报,1995(6):583-587.
[11]骆念海.井壁竖直附加力的影响因素分析[J].煤炭科学技术,2000,28(12):41-43.
[12]马时先.桩身负摩阻力的现场测试与研究[J].岩土力学,1997,18(1):8-15.