Development And Test Of Mechanical Simulation System For Inclined Shaft Frozen Wall In Pore Water Bedrock

Under the background that mining constructions have shifted to deep water-rich stratum in western China and the interactions between shaft lining, pore-water pressure and surrounding rock always play a leading role in design process, it becomes more unreasonable to still apply the research achievement of the design method of freezing sinking shaft lining on surface soil section to guide the inclined shaft lining design in pore-water rock. Therefore, it is quite valuable in both theory and applications to carry out the test system to simulate the interactions in porewater rock and to provide equipment support and testing guidance.This paper describes design of the test device of the interactions between shaft lining and pore-water pressure or surrounding rock in porous aquifer rock.First, the whole physical model scheme is projected through numerical simulation. By analyzing the effect of different factors on the stress and temperature fields of surrounding rocks and the pressure-loading states of shaft lining, the layout of sensor is arranged. Meanwhile, systematic freezing scheme, insulation measures, saturated scheme, data acquisition scheme and loading schemes are put forward as well.Then, by applying the designed test device and scheme, the state analysis of inclined shaft lining during the freezing, thawing and normal stage is carried out. After investigating the actual working performance of the testbed,this paper confirms that the device could be used to prove the interactions laws. In the loading conditions of pure pore water pressure and pure earth pressure respectively, the pressure of soil pressure cell changes in linear. When it comes to the condition of pore water pressure and earth pressure exerting simultaneously, with the increasing of pore water pressure the strain changes ladder-likely when Y=1.0MPa,X=Z=0.6MPa and X=Z=0.8MPa.However, when X=Z=0.4MPa, the strain increases first, then decreases and finally rises again. During the freezing process, the tendency of the pressure of the soil cell is increasing continuously due to frost heave pressure. Under the influence of temperature stress, stress of surrounding rock, pore water pressure and frost heave force, strain gauge is under compressive stress and increases with freezing time. The value of strain reaches its peak once at the complete thawing transient.In conclusion, this apparatus simulating the interaction between shaft lining, surrounding rock and pore water has achieved the result of the test in porous aquifer formation under the pressure of water and ground. The law of stress and deformation of shaft lining, as well as the change of rock stress field and temperature field in freezing and thawing stage can also be obtained by the application of this test device. Furthermore, it can provide support and guidance to the test and design of shaft lining in porous aquifer rock regions.