Abstract:
To solve the technical problems of the freezing shaft sinking in western cretaceous water-rich strata, vibrating wire sensors and thermocouple are used to measure and analyze the stress and temperature of frozen shaft wall in a Gansu mine air shaft, analyze the change laws and reasons of the stressed shaft liner vertical and circular steel bars and freezing pressure, and the temperature field. The result show that the vertical steel bars are first under compressive stress and then tensile stress, the maximum tensile stress is 81.711 MPa, the circular steel bars are always under pressure and the maximum reaches -42.113 MPa, the maximum of freezing pressure can be 1.098 to 1.724 MPa, which is far less than the limit of eastern alluvium, the temperature of outer liner rise sharply after constructed and the highest be 62.3 ℃, then drop to below 10 ℃ and the difference value is as high as above 70 ℃, the shaft lining is too thick and cost is high,so the design and construction of western vertical shaft need to be further optimized.