富水性膨胀软岩底板大变形分析及控制研究

Analysis of Large Deformation Mechanism and Control Technology of Water-rich Swelling Soft Rock Floor

针对埋深较大条件下中央变电所底板为软弱遇水膨胀的泥岩且变形严重的难题,以某矿600 m埋深下9 m宽的中央变电所底鼓为研究对象,分析其地质条件和底鼓的力学破坏特征后,在其顶部及帮部原支护不变的情况下,提出了对底板进行开槽主动卸压的控制方法和砼反拱+底板锚杆的联合加固控制方法2种对策,对2种控制方案分别进行FLAC^(3D)数值模拟,并通过现场应用后,发现砼反拱+底板锚杆的联合加固控制方法可以更有效地控制中央变电所的底鼓,底鼓量降低了83.2%。

Aiming at the problem that the floor of the central substation under the condition of a large burial depth is a weak mudstone that swells in contact with water and is severely deformed,the bottom heave of the central substation with a depth of 600 m and a width of 9 m at a mine is the research object.After the geological conditions and the mechanical failure characteristics of the bottom drum,under the condition that the original support of the top and the upper part remains unchanged,the control method of active pressure relief of the bottom plate and the combination of concrete inverted arch+floor anchor rod are proposed.Two countermeasures for reinforcement control methods.FLAC^(3D) numerical simulation was performed on the two control schemes.After field application,it was found that the joint reinforcement control method of concrete inverted arch+floor anchor rod can more effectively control the bottom drum of the central substation.The kick drum volume has been reduced by 83.2%.