深立井基岩段井壁地压应力研究

揭示深立井及超深立井基岩段井壁地压应力的理论分析方法,为基岩段立井井壁的优化设计奠定基础。首先将立井基岩段井筒及围岩均按照轴对称受力状况建立力学模型,依据井筒开挖前后围岩受力状态的分析,通过围岩内表面与井筒外壁环向或径向应变相等原理,然后依据轴对称原理、弹性理论、静不定问题的求解方法等理论,求解出基岩段井壁地压应力的分布规律。所举算例得到的结果较为充分地反应了井壁中地压应力在井壁结构设计中的作用。其结果对深立井井壁结构的优化设计具有极为重要的指导作用。

Research on Ground Pressure Stress in Shaft Lining in Bedrock Section of Deep Vertical Shaft

Ground pressure stress of shaft lining in bedrock section of deep vertical shaft and extra deep shaft is revealed by theoretical analysis,which provides a basis for optimized design of shaft lining in bedrock section.At first mechanical model was established according to axisymmetric force condition in shaft and surrounding rock in bedrock section of vertical shaft,then the distribution regularity of ground pressure stress in shaft lining in bedrock section was analyzed based on the analysis of force condition in surrounding rock before and after excavation and by the principle of equal toroidal or radial strains in inner surface of surrounding rock and in shaft ektexine.With help of axisymmetric principle,elastic theory,static indeterminate problem solving method and so on the distribution regularity of ground pressure stress in shaft lining in bedrock section was obtained.The results of a case study demonstrated the effect of ground pressure stress in shaft lining in shaft lining structure design.The research results have important guiding effect in optimized design of shaft lining structure.