梅山铁矿东南井井底混凝土渣石疏通技术方案

Dredging Technical Scheme of Concrete Slag at the Bottom of the Southeast Shaft of Meishan Iron Mine

梅山铁矿东南井井筒承担着井下采矿过程中整个东区的回风任务,同时担负着向井下输送混凝土的任务。由于受到井筒地质情况变化的影响,-318 m水平东南井井筒底部出现了垮冒问题。由于采用管道输送混凝土的模式,溜灰管受到混凝土冲刷磨损易出现开裂、破损,并导致溜灰管出现漏浆问题,伴有井筒淋水问题,直接造成了该矿井下-318 m水平东南井井底被混凝土渣石堆积堵死,且东南井井筒内积聚了大量积水,影响了井下整个东区的回风效果。通过施工泄水孔来解决井筒积水隐患,同时将中深孔爆破技术与硐室爆破技术相结合应用于疏通该矿-318 m水平东南井井底混凝土渣石,最终实现了-318 m水平东南井井底渣石的爆破清理和疏通,解决了梅山铁矿井下-318 m及以下生产水平东区生产过程中的回风难题。

The southeast shaft of Meishan Iorn Mine is undertaking the return air task of the whole east area during the underground mining process,and the task of underground transportation of concrete.Due to the influence of the geological characteristics variation of shaft,the catastrophic collapse phenomenons are existed at the bottom of the southeast shaft in-318 m level. Due to the concrete pipe conveying mode is taken,the concrete chute is easy to be cracked and damaged under the action of erosion and abrasion of concrete,the slurry leakage of the concrete pipe phenomenon can also be existed,and the shaft water spray problem is also be caused easily,which caused the bottom of the southeast shaft in-318 m level be clogged by the concrete slag. Besides that,massive water is existed in the southeast shaft,which greatly affects the return air effects of the whole east area. The water hazard of the southeast shaft can be solved by the construction of sluicing drilling,and the concrete slag existed at the bottom of the southeast shaft in-318 m level of Meishan Iron Mine is dredged by comprehensive application of medium-length hole blasting technique and chamber blasting technique. The results show that the concrete slag existed at the bottom of the southeast shaft in-318 m level of the mine is dredged effectively,the return air problem of the-318 m level and its below levels of the east area during the underground mining process are solved effectively.