Study On The Influence Of Ground Water On Tunnel Construction In Mountaion Ridge And Its Prevention Countermeasures

As a kind of underground lineament building, the tunnel inevitably will pass through different hydrology geology in construction process and thus form a catchment corridor which usually occurs in most of tunnels. Pour water is a common geological disaster and the main disease in the tunnel construction. At the same time, it is also one main inducement cause of other geological disasters. Owing to the percolating water, emerge flooding, inrush putty, the frost heave to brave the putty, the cave-in, the depletion of shallow layer ground water and the surface, the surface collapse and the chemical corrosion are emerge in tunnel excavation. The consequence of tunnel disaster is serious, which can delay project time, reduce the economic efficiency, bring wicked social influence and even arose the life and property loss. So it is urgent for us to carry through the research on the geological disaster in tunnel construction process by ground water. The preventing and controlling measures against the ground water geological disaster are also needed.Based on the stability and reliability of tunnel and underground space structure(50334060), a key project of National Nature Science Foundation of China, and combined the ground water disaster in project construction process of Huangshangping tunnel project, this thesis studies the influence of ground water on mountain ridge tunnel constructions and the prevention measures.The main conclusions of this thesis are as follows:1. Through ground water and geological environment statistical analysis of the constructing Huangshangping tunnel, the author utilized the MTS815(made in America) to test the compression strength, tensile strength and infiltration flow characteristic of rock samples acted by ground water. The tests show that the ground water has obvious soft action to rock and the joint fissures obviously change the infiltration flow characteristic of rock.2. Utilize the rock abruption process analysis software( RFPA2D) and civil engineering analysis software(Rocscience), this thesis has analyed the rock asymptotic destruction and the infiltration flow field variation of tunnel zone in tunnel piercing. Based this analysis, it has analyzed the influence mechanism of ground water to mountain ridge tunnel construction.3. Based on the analysis of influence mechanism of ground water on mountain ridge tunnel construction, this thesis analysed the pour water factors of mountain ridge tunnel, subsequently at this foundation, it predicts the pour water forecasting to Huangshangping tunnel and provides some evidence for the anticipation scheme constitute of prevention and cure pour water in mountain ridge tunnel.4.Using the EMS-2 three component multiwave engineering seismograph and the SIR-20 Ground Probing Radar, matches the 100M antenna, this thesis carries out pour water forecast to some special geological sector, and brings forward corresponding prevention and cure project measures, which has effectively prevented geological disaster occur in unfavorable geological conditions such as F2,F3,F5 faults and karst region etc.5.According to the principles of tunnel ground water and the requirements of environmental protection, combining the current construction technology, waterproof material, technical level and the ground water prevention and cure rules of mountain ridge tunnel, this thesis proposes the ground water prevention and project technology of Huangshangping tunnel. The results also have provided a theory basis for the prevention and cure pour water in mountain ridge tunnel construction process.