RMR- Geomechanics classification of rock mass- CMRI - ISM classification
![](https://i.ytimg.com/vi/TM2b9a8BwgU/mqdefault.jpg)
8:23
Principles of roof bolt- beam theory
![](https://i.ytimg.com/vi/jvEQeZuqydI/mqdefault.jpg)
18:36
How to Measure Rock Mass Rating (RMR) | Practical Example and Tunnel Adjustments
![](https://i.ytimg.com/vi/9UaVp1EU730/mqdefault.jpg)
19:12
RQD- rock quality designation-pdf in description
![](https://i.ytimg.com/vi/tvu_iTQWeCw/mqdefault.jpg)
21:46
Lecture 01: Introduction
![](https://i.ytimg.com/vi/VsE3Rzawa2w/mqdefault.jpg)
19:25
L 58 Nonel Blast initiation
![](https://i.ytimg.com/vi/5dnVH7jCZKQ/mqdefault.jpg)
10:36
Dieter Nuhr GENIALE Wahlempfehlung 📢 So PEINLICH ist die Politik 🤡
![](https://i.ytimg.com/vi/XrmJcjvw8n8/mqdefault.jpg)
9:24
Déclarations de Donald Trump sur Gaza : "une provocation" et "une faute" pour Dominique de Villepin
![](https://i.ytimg.com/vi/56ajUb59DL8/mqdefault.jpg)
33:01