为了避免超弹性现象，提出动态约束法限制弹簧的可伸长长度；
To avoid the super elasticity, a dynamic constraint method was proposed to restrict the tensile length of springs;
虽然近几年来已成功研制了各种可伸长锚杆，但锚喷支护中混凝土喷层研究仍未有明显突破。
Although it has success development different producibility bolt in last few year, concrete spraying research have not the obvious break through in anchor spray support.
基于轴向可伸长梁的几何非线性理论建立了弹性直梁在热过屈曲静态大变形附近自由振动的几何非线性模型。
Based on the geometrically nonlinear theory for axially extensible beams, formulations of free vibrations in the vicinity of thermal post-buckling were derived.
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