1 中国煤炭地质总局勘查研究总院, 北京 100039
2 中国矿业大学矿业工程学院, 徐州 221116
煤矸石浆液的流变性能影响注浆的可泵性, 可通过调节粒径和水矸比对流变性能进行调控。本文测试了新鲜煤矸石浆液的流变性能、流动度及流动时间, 研究了不同粒径(100目、150目、200目、250目、300目, 分别对应150 μm、106 μm、74 μm、58 μm和48 μm)及水矸比(1.0、1.5、2.0)对煤矸石浆液流变性能的影响, 探讨了流变参数、流动度及流动时间的变化规律, 并提出了注浆建议。结果表明: 水矸比是煤矸石浆液流变性能的主控因素, 煤矸石浆液在水矸比为1.0时, 符合Herschel-Bulkley模型, 颗粒粒径会影响浆液的屈服应力和塑性黏度, 屈服应力为2.5~3.6 Pa; 在水矸比为1.5、2.0时, 符合Bingham模型, 颗粒粒径只影响浆液的屈服应力, 屈服应力为0.1~0.7 Pa。不同粒径煤矸石浆液的流动度均不低于365 mm, 流动时间在27~31 s。为提高浆液的可泵性, 可考虑采用较大的水矸比(≥1.5)和较长的搅拌时间(>800 s)。
煤矸石 粒径 流变性能 屈服应力 流动度 流动时间 coal gangue particle size rheological property yield stress degree of fluidity flow time
Author Affiliations
Abstract
Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
A simple capillary-based extrinsic Fabry–Perot structure is presented and fabricated, using the manual welding method with the strain sensing characteristics investigated in detail. Strain sensitivities of 4.2, 2.8, and 2.4 pm/με are obtained experimentally with the interferometer length around 50 μm and the inner diameter of 75, 50, and 25 μm, respectively. The underlying physics of the strain sensitivity of this device is negatively correlated with the interferometer length and positively correlated with the capillary inner diameter, which provides two simple parameters to tailor the strain sensitivity.
060.2370 Fiber optics sensors Chinese Optics Letters
2017, 15(7): 070601
