Stress shell, which bears and pass load of overlying strata, is primary supporting body.The stress in skewback of stress shell forms abutment pressure of surrounding rock in vicinity of working face.

• 应力壳承但并传递上覆岩体荷载和压力，是最主要的承载体，应力壳拱脚处应力形成采场四周围岩支承压力。