GEOMECHANICS A tunnel is to be constructed 160 m below ground level, through a h
ID: 110699 • Letter: G
Question
GEOMECHANICS
A tunnel is to be constructed 160 m below ground level, through a highly fractured rock mass where the RQD is 35% and the uniaxial compressive strength of the intact rock cores ranges from 60 to 80 MPa. The joints are separated by 3-4 mm, filled with some clayey silt and are continuous extending to several metres. The joint surfaces are smooth and undulating. Some preliminary measurements show that the groundwater pressure is about 140 m of water and that the overburden pressure can be taken as 160 m of rock. In the absence of any knowledge about the in situ stress ratio, the vertical overburden stress can be taken as the major principal stress. The average unit weight of the rock can be taken as 27 kN/m^3. Estimate the RMR value, without the adjustment for the discontinuity orientation.Explanation / Answer
In the given question first of all we should describe about the tunneling in the underground. it is very much essential to understand the fact of the geomechnics to solve such questions.
When suppose we have to construct a tunnel which is at any perticular depth from the surface of the earth crust. then for that amount of depth it will get a sufficient pressure as well as compressive force which will produce the fatigue of the land mass. this mass is such that it will slide towards the down. to make preventions we have to first analyse the region of tunneling and estimate the rock range or layers passing over there. then we can produce the tunneling in that region.
We need more data to solve this problem and please post a disgram for the understanding and then post it again
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.