Sentence examples for strata control from inspiring English sources

However, depillaring encounters strata control problems due to competent overlying strata.

But, this method experienced strata control problems during final extraction.

Many strata control methods have been developed to support the roadways under complex conditions in China and other countries.

This paper also describes technological concepts implemented for better strata control in providing safe working environment in underground mine.

Under this method of extraction, strata control is a major problem affecting safety and productivity of the mine.

Germany has some of the deepest coal mines in the world, and the leading strata control technology for deep roadways (Shi et al. 2009, 2013).

23 We used standard conditional regressions for matched case-control studies using the "proc logistic" procedure with the "strata" statement to control for matching.

The rules of development of mining fractures in strata over panels control gas production of surface wells.

For instance, there are altogether 4,011 strata for the HLA- DRB1, - DQB1 and - A genotypes, resulting in an effective sample size of 1,133 cases and 453 controls, after those strata consisting of all controls or all cases were eliminated.

The effect of controlling strata movement in solid filling mining depends on the filling rate of the goaf.

Water-preservation mining is one of the most important parts of the 'Green Mining' technology system, which can realize the effective regulation of groundwater resources by controlling strata movement, changing passive prevention and governance of water disasters to active conservation and utilization of groundwater resources and thus obtaining coal and water simultaneously in mining.