煤柱稳定既取决于外加载荷，又取决于其内在性态的变化。
The stability of coal pillars depends upon additional load as well as change of its internal characteristics.
当外加载荷超过材料强度极限而造成零件断裂称为过载断裂。
When the applied load exceeds the limit strength of the material as a result of parts breaking overload fracture.
实质断裂强度性能受到了外加载荷与磨削残余应力的组合应力的制约。
The real fracture strength is restrained by both stresses caused by outside load and residual stresses after grinding.
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