INVERT ARCH LENGTH OF HORSE SHOE SHAPE TUNNEL

For calculating the invert arch length of horse shoe shape tunnel , most of the time we depend on Auto Cad, as well as various hectic calculations.

From my past experiences and as per knowledge, the short-cut calculation has been developed, called as CBS  FACTOR, the calculation has been shown below……..

INVERT ARCH LENGTH OF HORSE SHOE SHAPE TUNNEL =  d X CBS FACTOR

Where,

d = Dia. Of horse shoe shape tunnel

CBS FACTOR = 0.8481

From above formula, we can calculate Ivert Arch length instantly with simple multiplication.

For example….

For a 6mt. dia tunnel, the Arch length has been calculated…

Invert Arch length = d x 0.8481

             6 x 0.8481 ->   5.0886 m

The above calculation can be verified using Auto-Cad or any mathematical technique

       

PERIMETER OF HORSE SHOE SHAPE TUNNEL (Excluding Invert Arch)

For calculating the cross-sectional Perimeter of Horse Shoe Shape, most of the time we depend on Auto Cad, as well as various hectic calculations.

From my past experiences and as per knowledge, the short-cut calculation has been developed, called as CBS FACTOR, the calculation has been shown below……..

PERIMETER OF HORSE SHOE SHAPE TUNNEL =  d X CBS FACTOR                     (Excluding Invert Arch)

Where,

d = Dia. Of horse shoe shape tunnel

CBS FACTOR = 2.41880624

From above formula, we can calculate Perimeter instantly with simple multiplication and division.

For example….

For a 6mt. dia tunnel, the Perimeter has been calculated…

Perimeter = d X 2.41880624

            6 X 2.41880624 ->  14.512  mtrs

The above calculation can be verified using Auto-Cad or any mathematical technique

     

PERIMETER CALCULATION FORMULA OF HORSE SHOE SHAPE TUNNEL

For calculating the cross-sectional Perimeter of Horse Shoe Shape, most of the time we depend on Auto Cad, as well as various hectic calculations.

From my past experiences and as per knowledge, the short-cut calculation has been developed, called as CBS FACTOR, the calculation has been shown below……..

PERIMETER OF HORSE SHOE SHAPE TUNNEL =  (2d)/ CBS FACTOR

Where,

d = Dia. Of horse shoe shape tunnel

CBS FACTOR = 0.6122

From above formula, we can calculate Perimeter instantly with simple multiplication and division.

For example….

For a 6mt. dia tunnel, the Perimeter has been calculated…

Perimeter = (2d)/ 0.6122

            (2X 6)/ 0.6122 ->   19.60 mtrs

The above calculation can be verified using Auto-Cad or any mathematical technique

We found geological cracks at bottom during Head Race Tunnel excavation in Dikchu- 96 MW, Hydro Electric Project in Sikkim, India. Expert team has decided to apply treatment by trench cutting followed by RCC application. Further we appreciate your helpful suggestions to over come such phenomenon in future for safe and successful construction practices.