锦丰金矿深部地应力测量及分布规律分析

锦丰金矿矿体最大埋深900 m以上,目前已逐步转入深部500 m开采,区域地应力明显增大,巷道支护体开裂变形、片帮、底鼓等问题日益突出。为了切实掌握深部地应力的实际状态,采用空心包体应力解除法和DCDA法测得标高157 m、90 m、24 m、-59 m共4个标高段的9组应力数据,结果显示:深部最大水平主应力方向为北东向,在90 m水平以上,地应力以垂直应力为主;90 m以下逐步转为以水平构造应力为主。采深最低处90 m标高最大水平主应力为17.3 MPa。通过数据趋势拟合推测矿体埋深最深处-250 m标高的最大水平主应力将达到42.97 MPa。本次地应力实测成果可作为矿山深部巷道工程布置和支护方案设计的重要依据。

Crustal stress survey and distribution rule analysis deep in Jinfeng Gold Mine

Jinfeng Gold Mine is buried 900 m at the deepest point and now is gradually going to the 500 m deep mining where crustal stress significantly rises inducing problems such as supporting bodies cracking and deforming,wall caving and squeezed floor.In order to master actual situations of deep crustal stress,hollow inclusion stress relief method and DCDA method obtained 9 groups of stress data by measuring 4 elevations,that is 157 m,90 m,24 m and-59 m.The results show that the maximum horizontal main stress in deep part is NE,and above 90 m elevation,the crustal stress is dominated by vertical stress;below 90 m elevation,it is gradually replaced by horizontal tectonic stress.The maximum horizontal main stress is 17.3 MPa at the deepest mining depth of 90 m elevation.It is indicated by data trend fitting that at the deepest part of ore bodies burial depth-250 m elevation,the maximum horizontal main stress could be 42.97 MPa.The crustal stress measurement achievement can be used as important reference for the roadway engineering layout and support scheme design deep in mines.