The groutability of jointed rock should be increased by the grouting pressure because of the elasticexpansion of grouted fractures.
岩体的可灌性不仅取决于受灌裂隙的初始开度，还与在灌浆压力作用下裂隙的弹性扩张值有关。
2
The nonlinear vibration equation of the elastic straight bar under thermal expansion and harmonic excitation is obtained by Galerkin principle.
由伽辽金方法得到了弹性直杆热胀冷缩状态下受均布简谐激励的非线性振动方程。
3
Thermit welding and elastic fastening device can reduce the number of joints, overcome the thermal expansion and cold shrinkage of rails, and make the operation of traveling crane smooth and steady.