Lot of literature are available on this topic, i understood that you would like to do research on change in the engineering characteristics of rock due to tunnelling. I recommend to you to read the papers attached herewith for your reference. all the best in your research.

Dear Kumar;

I suggest these papers.

http://www.sciencedirect.com/science/article/pii/S167477551630004X

http://www.tandfonline.com/doi/full/10.1080/24749508.2017.1301062

Mr Kumar, there are different types of problems as far as the interference between external slope and tunnel is concerned (subsidence, vibration, monitoring, induced stresses). I send you two papers I published in the past

- Reinforcement design and control of rock slopes above tunnel portals in northern Italy Article in International Journal of Rock Mechanics and Mining Sciences 41(3):515-515 · May 2004

- Ground vibrations problems in the excvation of tunnels under small rock cover Article published in SWEMP2004.

Regards

Good afternoon Mr. Kumar,

I suggest a paper which is truly important, in my opinion, about the general effects of tunnelling, during the excavation stages. This is not specifically related to the external slopes, but I think it is anyway important as a background . It is not mine, Link here below

Conference Paper The Italian approach for the design and the excavation of co...

Thanks all of you for your valuable suggestions.

I will look all your suggestions and proceed further.

Hello,

some references:

Ashtiani, M. & Palassi, M., Ahmadi, A. (2010). Effect of excavation of tunnels in the convex slopes using distinct element method. Rock Mechanics in Civil and Environmental Engineering. 391-394.

Koizumi, Y., Lee, J., Date, K., Yokota, Y. & Yamamoto, T., Fujisawa, K. (2010). Numerical analysis of landslide behavior induced by tunnel excavation. Rock Mechanics in Civil and Environmental Engineering. 555-558.

Lin, M.-L., Chung, C.-F., Jeng, F.-S., Yao, T.-C., (2007). The deformation of overburden soil induced by thrust faulting and its impact on underground tunnels. Engineering Geology(92). 110-132.

Runqiu, H., Huabo, X. (2010). Deformation mechanism of a shallow double-arch tunnel in a sloping rock mass. Bulletin Engineering Geology Environment. 89-97.

Yashima, A., Zhang, F. & Ye, G.L., (2005). Progressive failure of slope due to tunnel excavation and its numerical simulation. Proceedings of 16th International Conference on Soil Mechanics and Geotechnical Engineering. 2611-2615.

Thanks Rafik sir