ABSTRACT
Xinzhuang mine is located in the southwest of ning country in Gansu province, and well construction scale is 8 million t/year. Comprehensive excavation method is applied in the lord-vice (wind) shaft. Design full depth of wind shaft is 966.6 m, and net diameter is 7.5 m, and the maximum diameter is 11.3 m. The formation of side wall adopted reinforced concrete composite structure. The external wall thickness is in the range of 500∼550 mm, and the internal is 600∼1350 mm. Concrete grade is from C50 to C80. Rebar grade is II, and diameter is in the range of 22∼28 mm.
