结合试验结果，对粘钢加固混凝土梁在不同卸载条件下的受力机理进行解析分析，推导相应计算公式，为加固设计提供参。
Based on experimental results, the stress of the rc beams under different unloading condition is analyzed, the formulation is deduced and it provides a reference for the reinforcement design.
由于岩体在加载和卸载条件下应力路径的不同，仅采用加载条件下所建立的力学模型来研究隧道的开挖稳定性问题是不适合的。
Due to the difference in stress paths between the loading and unloading conditions, it is unsuitable to apply mechanical model under loading condition to stability of tunnel excavation.
进行了岩石在峰值荷载变形条件下的松弛试验及峰值荷载前的加卸载试验。
The stress relaxation experiments of rocks under the deformation at peak load and load-unload experiments before peak load are carried out.
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