保证巷道稳固性的支架,应具有相应的支撑力和可缩性。这种支撑力和可缩性之间的比例关系,通常称为刚度g。为了计算可缩性支架所需要的刚度,研究了掘进在距地表深度H处、各向同性均匀介质中的长距离圆形水平巷道的弹塑性问题。问题的解决归结为具有环状断面,半径为R_0、不计自重的薄层在平面变形中应力场和位移场的确定。该薄层外边界上作用着径向负载γH,内边界上作用着P_(ok),它等于支架的弹力。 假设外边界无切向荷载,则是轴对称问题。由于巷道周围岩层应力集中引起的 Stent to ensure the stability of the roadway, should have the appropriate support and retractability. The ratio between support and retractility is often referred to as stiffness g. In order to calculate the stiffness required for retractable supports, the elasto-plasticity of long-distance circular horizontal roadway heading in the isotropic homogeneous medium at tunnel depth H is studied. The solution of the problem can be attributed to the determination of the stress field and the displacement field of a thin layer with a ring-shaped cross-section and a radius of R_0 without weight. Radial load γH acts on the outer boundary of the sheet and P_ (ok) acts on the inner boundary, which is equal to the elastic force of the stent. Assuming there is no tangential load on the outer boundary, it is an axisymmetric problem. Due to stress concentration in rock strata around the roadway