Health & Environmental Research Online (HERO)


Print Feedback Export to File
5702213 
Journal Article 
On-Site Tests of a New Type of Tunnel Lining at the Nurek Hydrostation Construction Site 
Rukin, VV; Kuperman, VL 
1984 
Kluwer Academic Publishers-Plenum Publishers 
18 
8 
345-356 
English 
The maximum use of the bearing capacity of the rock mass is one of the principal ways to reduce the thickness of linings of hydraulic pressure tunnels. A new material, latex concrete, can be used to allow the rock to absorb the load from the internal pressure of the water because it can provide the necessary yielding and elasticity at a high tensile strength. The addition of synthetic styrene-butadiene latex SKS-65GP to the concrete mix in the amount of about 10% of the dry weight of the cement leads to a decrease of the modulus of deformation of concrete by more than two fold. The addition of latex to concrete makes it possible to reduce the water/cement ratio and to improve the technological properties of the concrete mix - fluidity, plasticity, and workability. Latex concrete can be prepared in ordinary concrete mixers and does not cause additional difficulties in concrete works. Large-scale investigations in an experimental gallery of tunnel 9-TTs at the Nurek hydrostation construction site were undertaken to obtain the data on the work of a tunnel with latex concrete in contact with massive rock and to perfect the technological parameters of concreting. The high elasticity of the latex concrete in combination with its increased ultimate tensile strength makes it possible to reduce the thickness of latex concrete linings compared with ordinary concrete by at least half. For the permanent headrace tunnels of the Nurek hydrostation show that the use of the latex concrete makes it possible to dispense with reinforcement of the lining and to use consolidation grouting of the rock with a total saving of 0.5 million rubles. In the near future latex concrete will be used in the linings of hydraulic structures (pressure tunnels) at a number of installations. (Shieh-IVI) 
Water Resources Abstracts; Tunnel linings; Linings; Latex concrete; Concrete technology; Elasticity; Deformation; Strength; Tunnels