煤矿突水事故是造成从业工人生命损失和安全生产的关键因素,而在事故发生后进行紧急疏水是处理事故的重要手段。运用GMS5.0软件对某煤矿在突水情况下的疏水状况进行模拟预测,得出以下结论:(1)在富水区内设置疏水井,在突水时进行紧急抽水可以起到快速降低水位的作用,对生产者的生命安全和生产安全有着明显的作用;(2)随着抽水时间的延续,水位的下降速度变慢。
贺兰石的岩石学名称为紫色间灰绿色粉砂质板岩,主要矿物成分为绢云母和伊利石,主要化学成分为SiO2、Al2O3、Fe2O3、K2O,具变余泥质结构、变余砂质泥质结构,板状构造。其产于贺兰山中段新元古界青白口系黄旗口组下部,矿层呈单层产出,厚3.4～12.2m,结构单一,无夹石。贺兰石基本色调为紫色,嵌以灰绿色斑、带、层,紫绿两色自然交融,即层次分明,对比强烈,又自然和谐;矿物颗粒细小,石质致密坚实,经雕琢、打磨后感观细腻、娇嫩,有玉之美感;吸水率为0.1%～0.73%间,较为适度;摩氏硬度为3～4,刚柔相济,以其制砚,可雕性强,发墨好,砚堂不易损;贺兰石无裂纹、脉体缺陷,仅偶见红、绿色砂质色层,若能合理利用,可使其增辉。
Helan stone is one of five treasures in Ningxia,and has great economic value and cultural meaning.This paper takes the middle Helan mountain in the west of Yinchuan City as the research area,which investigated and analyzed the occurrence characteristics and mineral characteristics of Helan stone.It can be concluded that(1) Ore-bearing lithologic of Helan stone occured in the lower part of the first rock segment in Huangqikou Fm of Qingbaikouan System,and which is narrow banded distribution,stable continuous layer,roughly north-south direction,extending along the length of about 14 km.The thickness of the ore-bearing lithologic is between 8 to 23 m;(2) The main components of the ore are clay minerals,sericite and chlorite,and the main chemical ones are SiO2,Al2O3,Fe2O3,K2O;(3) The water absorption of the ore are less than 1%.Mohs scale of hardness is between 2 to 4.The average density is 2.89 g/cm3.The compressive strength is 58.17 MPa.The tensile strength is 7.1 MPa,and shear strength is 19.16 MPa;(4) Helan stone has broad mining prospects and large industrial value in the research area.
