Hydraulic fracturing test in the YS-4 borehole

Generally with the fact that it has the change where the initial stress is considerable it is become known that the horizontal stress is bigger normal stress than relatively from within depth 500m and (Brown and Hoek and 1978), from the area of the condition which undergoes a terrain school register or the influence of structural motion it is reported (Goodman and 1989). Consequently, the lateral pressure coefficient which is an essential input data of the tunnel and underground spatial plan at the time of numerical analysis must be applied public corporation according to the sector certainly the thread side price in compliance with actual measuring, according to aspect of lateral pressure coefficient a similar stress distribution in one ambient base rock which is possible in order to maintain, to consider the concept of artificial flower commonness and (Harmonic hole) must investigate a tunnel form