钻井井壁破坏分析及强化结构

研究近年来钻井井壁在使用中出现的局部破坏情况，在分析其原因的基础上，提出在今后的钻井井壁设计中应考虑表土与岩石交界处的井壁水平截面上竖向附加弯矩的影响、单节井壁法兰盘附近的水平截面上竖向约束弯矩的影响和增设径向联系筋的构造措施，从而达到强化钻井井壁结构的目的。为此，导出了竖向附加弯矩和法兰盘约束弯矩的计算方法，提出了径向联系筋的形式及数量。

SHAFT LINING FAILURE ANALYSIS AND REINFORCEMENT STRUCTURE

Local failures of shaft lining used in practice in shaft drilling is studied in the recent years. The paper points out that in order to strengthen the structure of shaft lining attention should be attached to the effect of additional internal bending moment at certain horizontal section of the shaft lining at the interface between surface soil and rocks, as well as the effect of the vertical confining moments at horizontal section near the flanges and additional radial reinforcements should be made in the shaft lining. The methods for calculation of additional vertical bending moment and confining bending moment of flanges are deducted, and the type and quantity of radial reinforcements are proposed.