综放开采沿空留巷围岩变形特征

为研究综放开采沿空留巷围岩变形特征,以山西铺龙湾煤业有限公司4102综放工作面为工程背景,从理论层面分析了沿空留巷围岩大变形机理,发现4102综放工作面沿空留巷围岩发生大变形主要原因是基本顶关键块体断裂回转使留巷位置由低值应力区变为高值应力区,在此基础上采用FLAC3D软件对沿空留巷围岩应力分布规律及变形特征进行分析。结果表明在支护初期巷旁支护体垂直应力为1.5 MPa,巷道围岩水平位移极小,当基本顶发生断裂后,巷旁支护体垂直应力增加,最大达3.22 MPa,此时的变形速率也达到最大,随着上覆岩层触矸,巷道围岩垂直应力及两帮变形速率也逐渐稳定。

Deformation characteristics of surrounding rock of gob-side entry retaining in fully mechanized caving face

In order to study the deformation characteristics of surrounding rock of gob-side entry retaining in the fully mechanized caving mining,taking the No.4102 fully mechanized caving face of Pulongwan Coal Mine as the engineering background,the deformation mechanism of surrounding rock of gob-side entry retaining was analyzed theoretically.It is found that the main reason for the large deformation of the surrounding rock of the gob-side entry in the No.4102 fully mechanized caving face is that the rotation of the key block makes the gob-side entry from the low stress zone to the high stress zone.On this basis,the stress distribution and deformation characteristics of surrounding rock in the gob-side entry were analyzed by the FLAC3D software.The results show that:in the initial stage of support,the vertical stress of roadside support is 1.5 MPa,and the horizontal displacement of roadway surrounding rock is very small;when the main roof breaks,the vertical stress of roadside support increases to 3.22 MPa,and the deformation rate reaches the maximum;with the overlying strata touch the gangue,the vertical stress of roadway surrounding rock and the deformation rate of two sides are gradually stable.