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张双楼矿位于微山湖畔大屯矿区的西侧,井田面积34km~2,设计能力为120万t/年,1978年开始建设,1986年12月投产.主井直径5.5m,井深628m,副井直径6.5m,井深586m.矿区新地层厚达242m,主副井选择冻结法施工.由于基岩也有含水层,冻结深度为:主井深孔325m、浅孔275m,副井深孔345m、浅孔290m.当时速冻结深度是国内最深的冻结井,现仍占第四位.新地层沉积异常复杂,详见图1.砂性土约占52.4%,
Zhang Shuanglou Mine is located on the west side of Datun Mining Area beside Weishan Lake with an area of 34km ~ 2 and a designed capacity of 1.2 million t / y. Construction began in 1978 and commenced operation in December 1986. The main shaft has a diameter of 5.5m and a well depth of 628m. The diameter of the auxiliary well is 6.5m and the depth of the well is 586m.The thickness of the new formation in the mining area is up to 242m, and the main and auxiliary wells are selected to be frozen.As the bedrock also has aquifer, the freezing depth is 325m for the main well, 275m for the shallow hole and 345m for the auxiliary well, Hole 290m. At that time, the quick freezing depth is the deepest frozen well in China, and still occupies the fourth place. The new formation deposition is extremely complicated, as shown in Figure 1. Sandy soil accounts for 52.4%