摘要
为了探索厚松散地层深部失水层位的钻孔注水特性,采用一种新型的光纤光栅传感系统实现了某矿松散层注水过程中应变的在线监测。介绍了在深度+115.83～+135.15 m处松散层注水实施过程,及通过2个钻孔对注水层位应变和水位监测的光纤Bragg光栅系统及水位监测系统,注水试验注水压力值依次为0.1,0.2,0.3 MPa和总注水量达到4226.84 m3。分析了注水压力、注水量和松散层应变变化的关系,松散层在注水前后和过程中松散层应力应变状态。试验表明,随着注水压力升高和注水量增加,松散层压缩状态得到改善,较注水前,注水后注水层位呈明显拉伸状态。光纤光栅监测系统灵敏、稳定,能够实现对松散层深部注水的过程实时监测,试验为进一步实施松散层地区沉降治理提供了重要的依据。
In order to explore the behavior of dewatered unconsolidated strata during the process of injecting water through a borehole from the surface, a new type of fiber Bragg grating（FBG） sensing system was successfully used for the real-time strain monitoring of unconsolidated strata during a water injection process into a dewatered unconsolidat- ed strata of a coal mine. The unconsolidated strata water injection test was implemented through a borehole from the surface at a depth of ＋ 115.83 to ＋ 135.15 m. The employed fiber Bragg grating sensing system and monitoring change of the ground water level were introduced at the depth in the unconsolidated strata where the water injection was con- ducted through two boreholes from the surface. Water injection pressures during the test were 0.1,0. 2,0. 3 MPa,and the total water injection volume was 4 226.84 m3. The relationship between the water injection pressures,water injec- tion volume and the strain change of the unconsolidated strata, the stress and strain conditions of the unconsolidated strata before and after water injection were analyzed. The results show that the dewatering compression of the unconsoli- dated strata is reduced with increasing water injection pressures and water injection volumes. When comparing the condi- tions before and after water injection,it is found that the stress of the unconsolidated strata is in tension after the injec- tions. The FBG monitoring system is very sensitive and stable, and it can realize the real-time strain monitoring of the water injection process within a deep unconsolidated strata through a surface borehole. This FBG monitoring system and the test result presented are very important for understanding further treatment of settlement in unconsolidated strata.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第2期200-205,共6页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50774060)
国家自然科学基金科学仪器专项资助项目(41027002)
陕西省岩层控制重点实验室资助项目(08JS42)
关键词
光纤Bragg光栅监测系统
松散地层
注水试验
fiber Bragg grating monitoring system
unconsolidated strata
water injection test
