bedrock

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bedrock

The solid rock under soil.
References in periodicals archive ?
The main parameter in the above dependencies that need justification is permeability of the filtration environment (hanging bedrocks, surface coal beds, caved-in bedrocks into the goaf).
The studies made are the basic part of developing an algorithm for calculating parameters of degassing (gas production) wells, including design of integrated coal mining and methane production in promising areas with flat bedrocks with high gas content.
Overlying rock masses hang in the goaf for a certain time and then collapse (or slowly descend), loading with their weight worked-out strata bedrock.