分布式光纤传感技术在采煤塌陷残余变形监测上的应用

Application of distributed optical fiber sensing technology in monitoring residual deformation in coal mining subsiding area

文章针对采煤塌陷区深部岩土体分层变形监测的难题,介绍了分布式光纤感测技术原理及测试方法,并通过工程试验,验证了该方法应用于采空区残余变形监测的可行性。结果表明:分布式光纤感测技术应用于采煤塌陷残余变形具有明显的优势,不仅可以监测地层的沉降变形大小,还可以精确定位深部变形岩层的层位和深度;根据光纤应变测试曲线可对被测岩土层进行分层,划分出采煤塌陷"三带",即冒落带、导水裂隙带和弯曲沉降带。

To cope with the difficulty of monitoring deep rock-soil body deformation in coal mining subsiding area, the principle and test method of distributed optical fiber sensing technology are introduced. Based on the concrete engineering examples, the feasibility of its application in monitoring residual deformation in the worked-out section is studied. It is demonstrated that the distributed optical fiber sensing technology has great advantage in monitoring the residual deformation in coal mining subsiding area, which can not only test the scale of settlement and deformation, but also precisely locate the stratum and depth of the deep deformed rock formation. Based on the fiber strain test curve, the tested strata can be divided into ＂three zones＂, namely caving zone, fault zone and bending deformation zone, for coal mining.