斜井穿越流砂层支护结构受力特征分析

Analysis on Mechanical Characteristics of Supporting Structure of Inclined Shaft Crossing Quicksand Layer

为了在深埋较厚流砂地层选取合理的支护结构断面尺寸和支护参数,依托实际施工背景,通过数值模拟和现场实测相结合的研究方法,分析了不同影响因素下井壁结构受力特征,主要规律有:①随着地层压力增大,拱顶与拱脚弯矩变化较小,边墙、底角及底板位置的弯矩值均呈线性增加,各位置轴力值也呈线性增加的趋势。②随着边墙高度的变化,各关键部位的弯矩和轴力绝对值变化不显著,只是边墙上侧的弯矩有一个从正到负的变化过程。③随着结构底拱半径的变化,结构弯矩图在底板部位变化最为明显,底拱半径越小,底板负弯矩范围愈小,轴力分布愈均匀,并且可以改变底板的受力状态,提高底板的承载能力。最后结合现场实测结果验证,可以为深厚流砂地层斜井的安全施工提供参考。

In order to select reasonable support structure section size and support parameters in deep buried thick quicksand stratum,based on the actual construction background,through the research method of numerical simulation and field measurement,the stress characteristics of shaft lining structure under different influence factors are analyzed.The main laws are as follows:①with the increase of formation pressure,the bending moment of arch crown and arch foot changes little,side wall,bottom angle and bottom plate,the bending moment and axial force at each position increase linearly.②With the change of the height of the side wall,the absolute value of the bending moment and axial force of the key parts do not change significantly,but the bending moment of the upper side of the side wall changes from positive to negative.③With the change of the radius of the bottom arch,the bending moment diagram of the structure changes most obviously at the bottom plate.The smaller the radius of the bottom arch,the smaller the negative bending moment range of the bottom plate,the more uniform the axial force distribution,and can change the stress state of the bottom plate and improve the bearing capacity of the bottom plate.Finally,combined with the field measurement results,it can provide a reference for the safe construction of inclined shaft in deep quicksand formation.