超挖 meaning in English

backbreak
outbreak
over excavation
overcut
overdredging
overexcavate
overexcavation（overbreak）

Fractal character of over - excavation of tunnel surrounding rock
隧道围岩超挖的分形特征研究
New technique of control digging shaft
控制井筒过量超挖欠挖的新工艺
Ground subsidence , rebound deformation and horizontal deflection were measured , displacements inside the excavated slope were monitored and ground cracks and failure modes caused by extra excavation were investigated
测试内容包括土体位移、地表沉降、基底隆起、地面裂缝及超挖引起的破坏形态。