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为解决西部白垩系富水地层冻结法凿井的技术难题,采用振弦传感器和热电偶对甘肃某矿风立井外壁竖筋、环筋受力与冻结压力的变化规律和成因以及外壁温度场的变化等进行实测。结果表明,外壁竖筋先受压后受拉,最大拉应力达81.711 MPa,环筋均受压,最高为-42.113MPa;冻结压力达1.098~1.724 MPa,但远小于东部冲积层限值;外壁浇筑后急剧升温,最高为62.3℃,随后迅速降低并低于-10℃,同一点前后温差在70℃以上;井壁设计过于保守,施工进度慢、成本高,对西部立井井壁设计施工需进一步优化。
In order to solve the technical problems of freezing shaft sinking in the western Cretaceous water-rich strata, the variation rules and causes of vertical reinforcement, ring reinforcement stress and freezing pressure on the external wall of the wind shaft of a mine in Gansu Province were analyzed by using vibrating wire sensors and thermocouples. Change, etc. were measured. The results show that the maximum tensile stress reaches 81.711 MPa, the maximum tensile stress is -42.113MPa, and the freezing pressure reaches 1.098 ~ 1.724 MPa, which is far less than the limits of the alluvial layer in the east. The outer wall After pouring a sharp rise in temperature, up to 62.3 ℃, and then rapidly decreased and below -10 ℃, the same point before and after the temperature difference above 70 ℃; borehole design is too conservative, slow construction progress, high cost, design and construction of the western shaft shaft wall advanced optimization.