上覆盖层 meaning in English

carry side cover
face cover

Anomaly over in - situ leachable sandstone type uranium deposit appears rather weak due to the thick cover , therefore , prospecting in this area is extremely difficult
摘要可地浸砂岩型铀矿床由于其上覆盖层较厚，地表异常信息十分微弱，找矿难度相当大。
The deleterious effects of pressurized seepage , percolating through the natural discontinuities in the rock mass , have generally been ignored , resulting in tunnel alignments with inadequate lateral and vertical cover
压力隧洞传统计算方法假定围岩是不透水介质，忽略了围岩中渗流和渗透力的不利影响，从而导致设计时隧洞轴线方向上覆盖层厚度不足。