节理剪切扩容效应意指节理在剪切过程中，由于节理面的起伏不平引起节理体积和厚度增加的作用。
The Shear Dilatant Effect of Joints Refers to the Increase of Joints' Volume and Thickness Accompanying Shear Displacement as Caused by the Asperity of the Joint Surface.
中间节理受压剪作用很快与相邻节理贯通导致节理岩体破坏。
The middle joints quickly connect to the adjacent joints with the action of compression-shear stress, which results in the rock failure.
分析结果还表明，“压力拱”效应在浅埋隧洞节理裂隙围岩稳定性中起着重要作用。
The pressure-arch effect on the stability of jointed rock mass surrounding a shallow tunnel proves to be important.
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