1) Owing to the effect of backwall pressure, make coal bed cutting strength occur variation.

2) The quality of freeway structure retailing backwall refilling concerns the freeway global quality.

3) This paper introduced backwall grouting process and grouting effect of-290 level downcast shaft in Jilongshan Gold Mine. The economic benefit of backwall grouting technique was analysed.

4) AMPLIFIER Function Separate programmable output, for example used for backwall monitoring.

5) In this paper the authors approach the application of drilling mud to face pre-injection, backwall infilling injcetion, roof fall space infilling injection and split zone infilling injcetion.

6) The paper discussed the construction technology and attentions of retailing backwall refill for flowing cement flyash.