Question added by
محمد محمود عبد الحميد عثمان
, CONSULTANT CIVIL ENGINEER ( ROAD CONSTRUCTION) , CONTRACTOR OFFICE IN ELFAYOUM CITY
Date Posted: 2013/05/21
by
محمد محمود عبد الحميد عثمان , CONSULTANT CIVIL ENGINEER ( ROAD CONSTRUCTION) , CONTRACTOR OFFICE IN ELFAYOUM CITY
1- control point survey wark by using gps station and total station to locate tunnel path exactly in field
2- locate the center line of the tunnel and begin to draw cross section of the tunnel every 25 meter
3- you have to take sample from soil every 50-100 meter to know the type of soil if this soil is collapsable soil or expansion soil and to know the rock mass rock material of soil
4- so the load in tunnel will be changed every 25 meter because of the type of soil
5- after to get the load every 25m in tunnel cross section you have to get coordinate of the located tunnel every 25m
6- you have to know where is the collapsable crown in tunnels so you can distribute the rockbolts pretension to prevent the collapse in tunnel