西部软岩冻结立井底鼓实测研究  

Study on Site Measurement of Floor Heave Occurred in Mine Freezing Shaft Sinking in Soft Rock of Western China

作　　者：姜国静 李爱民[3] 牛青河 郭登 

机构地区：[1]天地科技建井研究院,北京100013 [2]煤矿深井建设技术国家工程实验室,北京100013 [3]中煤第一建设有限公司第十工程处,河北邯郸056000 [4]中煤陕西榆林能源化工有限公司,陕西榆林719000

出　　处：《建井技术》2014年第4期38-41,共4页Mine Construction Technology

摘　　要：大海则煤矿主立井净直径9．6m，井深701．96m，采用全深冻结法施工，设计冻结深度718m，为西部软岩冻结井筒。井筒掘进到575m深处时，对工作面底鼓进行了实测研究。该处井筒揭露的岩性为粉砂岩，预测底部为泥岩。实测显示，底鼓量不大，呈现由井筒四周向井筒中心逐渐增大的现象，最大底鼓量仅20mm，平均底鼓速度为1．76mm／d，明显小于东部地区粘土层冻结段15～30mm／d的底鼓速度，说明冻结壁超前位移小，冻结壁稳定性强，掘砌施工安全；最大底鼓量出现在井筒西侧，最小底鼓量出现在井筒东侧，表明方位不同，冻结壁稳定性呈现不均匀性特征。该井筒底鼓实测研究，可为西部软岩冻结立井设计和施工提供参考。A mine main shaft of Dahaize Mine had a net diameter of 9.6m and a shaft depth of 701.96m. The mine shaft was construction with a full depth freezing method, a designed freezing depth of the mine shaft was 718m and the mine shaft was a mine freezing shaft in soft rock in Western Chi- na. When the mine shaft was excavated at a depth of 575m,a site study was conducted on the floor heave of the shaft sinking face. A lithology at the depth exposed of the mine shaft was siltstone and the bottom of the siltstone would be mudstone as predicted. The site measurement showed that a floor heave value was not high, there was a phenomenon that the floor heave was steadily increased from the mine shaft liner to the mine shaft center, a max floor heave value was only 20mm, an average floor heave speed was 1.76mm/day and was obviously lower than the floor heave speed of 15-30mm/day at a freezing section in clay layer of Easter China. Thus the floor heave could show that an advance displacement of the freezing wall was small,a stability of the freezing wall was high and the excavation and lining construction were safe. A max floor heave value was occurred at the west side of the mine shaft and a min floor heave value was occurred at the east side of the mine shaft. This showed different positions, the stability of the shaft freezing wall showed uneven features. The site study on the floor heave in the mine shaft could provide references to the design and construction of the mine freezing shaft in the soft rock of Western China.

关 键 词：西部软岩 冻结立井 底鼓 冻结壁 超前位移 

分 类 号：TD265.34[矿业工程—矿井建设]