济三矿风井厚松散层沉降变形光纤光栅监测方法

Monitoring and Measuring Method with Optical Fiber and Optical Grating for Thick Loose Strata Subsidence and Deformation in Mine Ventilation Shaft of Jisan Mine

为了准确预测深厚松散层深部层位因失水压缩变形,分析总结了松散层不同深度黏土层和砂层的失水特征、压缩变形特性,采用松散层钻孔植入式光纤光栅监测系统,对济三矿风井处第四系松散地层104—180 m段埋设的18个光纤光栅传感器进行了长期的实时监测,由光栅传感器监测的松散层应变得出了各层位的压缩变形量。监测结果表明,松散层下组的厚砂砾层是产生主要压缩变形层,可塑状态的厚黏土层也有较大压缩变形,其余层位压缩变形小。下组厚砂砾层和厚黏土层是重点监测层位,为深钻孔植入式光纤光栅监测系统监测设计提供了依据。

In order to accurately predict the compacted deformation due to water lost in the deep layer of the thick loose strata,the paper analyzed and summarized the water lost features and compacted deformation features of the different depth clay layer and sand layer of the loose strata.The optical fiber and optical grating monitoring system in the borehole of the loose strata was applied to the long term real-time monitoring and measurement with 18 optical fiber and optical grating sensors set in the 104—180 m section of the Quaternary system loose strata at the mine ventilation shaft of Jisan Mine.The optical grating sensors would monitor and measure the compacted deformations at each layer of the strains in the loose strata.The monitoring and measuring results showed that the thick gravel layer-low group of the loose strata was the main compacted deformation layer occurred,the plastic state thick clay layer had a high compacted deformation and the rest layers had a small compacted deformation.The low group,including the thick gravel and thick clay layer was the key monitoring and measuring layers,which could provide the references to the design of the optical fiber and optical grating monitoring and measuring system in the deep borehole.