煤田地质与勘探2025，Vol.53Issue(7)：128-140,13.DOI:10.12363/issn.1001-1986.25.03.0182
采动活化断层内水砂突涌规律及灾变机制
Regularity and mechanisms of water-sand inrushes within mining-activated faults
摘要
Abstract
[Background]During underground coal mining,water-sand mixtures within faults may rush into mine floors.The water-sand inrushes are especially prominent under the conditions of high water-yield properties and loose filling structures in fault zones,severely threatening the safe mining of coal mines.Previous studies focus primarily on the im-pact of a single factor on inrushes.Hence,it is significant to systematical investigate the regularity of water-sand in-rushes within faults under the combined effects of multiple factors.[Methods]Based on the fluid and granular mechan-ic theories,this study derived the instability criterion and flow formulas of water-sand mixtures.Using orthogonal exper-iments on three factors at four levels,along with a deformations-seepage test system for fractured rocks,this study in-vestigated the impacts of clay mass fraction,sand-grain size,and initial water pressure on the inrush behavior.[Results and Conclusions]Clay significantly inhibited the inrush behavior.Under a clay mass fraction of 40％,the inrush beha-vior exhibited extremely low flow and load.The initial water pressure served as the primary force driving the inrush be-havior.An increase in initial water pressure significantly enhanced the inrush intensity.The sand grain size manifested a nonlinearly regulating effect on the inrush behavior.Small or large sand grain sizes were prone to cause system instabil-ity,while moderate grain sizes could balance permeability and system stability.The multivariate statistical analysis re-veals that the impacts of various factors on the inrush behavior decreased in the order of clay content,initial water pres-sure,and sand-grain size.The predicted optimal test conditions to minimize the flow,load,and pore water pressure in-clude a clay mass fraction of 30％,an initial water pressure of 0.3 MPa,and sand grain size ranges of[0.3,0.5]mm,[1,2]mm,and[0.5,1.0)mm,respectively.The results of this study will provide a theoretical basis for the prevention and control of water-sand inrushes caused by mining-induced fault activation.关键词
煤矿/断层活化/水砂混合物/突水灾变/正交试验/影响因素/失稳条件Key words
coal mine/fault activation/water-sand mixture/water inrush/orthogonal experiment/influential factor/instability criterion分类
矿业与冶金引用本文复制引用
张士川,黄普,李杨杨,王成功,吴振华..采动活化断层内水砂突涌规律及灾变机制[J].煤田地质与勘探,2025,53(7):128-140,13.基金项目
国家自然科学基金项目(52474137) （52474137）
煤炭开采水资源保护与利用国家重点实验室开放基金项目(GJNY-20-113-19) （GJNY-20-113-19）
