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    沙漠区超大采高工作面采煤沉降特征及其浅层土壤物理特性响应

    Characteristics of coal mining subsidence in ultra-high mining heights in desert areas and responses of shallow soil physical properties

    • 摘要: 我国沙漠区生态环境脆弱、水资源匮乏,但开采强度巨大,因此对沙漠区高强度采煤浅表损伤规律的研究意义重大。以陕煤曹家滩煤矿高强度开采为背景,采用数值模拟和现场测试等方法研究了沙漠区高强度采煤沉降规律。在采动损伤认识的基础上,通过取样测试对采煤沉陷区土壤的容重和孔隙度变化规律进行了研究。结果表明:现场实测显示多工作面大规模开采后形成W形的剖面,沉降盆地中靠近首先开采的工作面一侧的沉降明显大于另一侧,最大沉降值为3.39 m,模拟值为3.40 m;两工作面之间最小沉降值为1.12 m,模拟值为1.26 m,数值模拟和现场实测结果相似。煤炭开采土壤容重随着裂缝宽度的增加呈现出减小的趋势,与无裂缝区域的土壤容重相比,裂缝宽度为20~40和60~100 cm的区域土壤容重变化较大,分别下降0.08和0.07 g/cm3。土壤容重随着沉陷深度的增加呈现出逐渐减小的趋势,与地表无沉陷的区域相比,沉陷深度为0~20 cm时,土壤容重有一定程度的增加,而沉陷深度为20~40和40~60 cm时土壤容重无明显差异。土壤孔隙度随着裂缝宽度的增加呈现出逐渐增加的趋势,裂缝宽度为0~20、20~40、40~60、60~100 cm时,土壤孔隙度分别变化了0.5%、-1.2%、2.3%、1.7%。土壤孔隙度随沉陷深度的增加呈现出逐渐增加的趋势,沉陷深度为0~20 cm的区域与未沉陷区域相比,土壤孔隙度无明显差异,沉陷深度为20~40和40~60 cm的区域与未沉陷区域相比,分别增加了5.8%和9.0%。研究为黄河流域沙漠区绿色开采提供了借鉴。

       

      Abstract: The ecological environment in China’s desert regions is fragile, and water resources are scarce, yet the mining intensity is extremely high. Therefore, studying the shallow damage patterns caused by high-intensity coal mining in desert areas is of great significance. Taking the high-intensity mining of Shaanxi Coal Caojiatan Mine as a case study, this research employs numerical simulation and field testing methods to investigate the subsidence patterns of high-intensity coal mining in desert regions. Based on an understanding of mining-induced damage, soil bulk density and porosity changes in mined subsidence areas were studied through sampling and testing. Results show that field measurements indicate a W-shaped profile formed after large-scale multi-working face mining, with significantly greater subsidence near the initially mined working face (maximum subsidence of 3.39 m, compared to a simulated value of 3.40 m). The minimum subsidence between two working faces was 1.12 m (simulated value: 1.26 m), demonstrating consistency between numerical simulation and field measurements. Soil bulk density decreased as crack width increased, with notable reductions in areas with 20–40 and 60–100 cm crack widths (decreases of 0.08 and 0.07g/cm3, respectively, compared to crack-free zones). Soil bulk density gradually decreased with increasing subsidence depth, showing a certain increase at 0–20 cm subsidence depth but no significant difference at 20–40 and 40–60 cm depths. Soil porosity increased progressively with crack width, varying by 0.5%, –1.2%, 2.3%, and 1.7% for crack widths of 0–20, 20–40, 40–60, and 60–100 cm, respectively. Soil porosity also increased with subsidence depth, showing no significant difference at 0–20 cm depths compared to non-subsided areas but increasing by 5.8% and 9.0% at 20–40 and 40–60 cm depths, respectively. The research provides valuable insights for green mining practices in desert regions of the Yellow River Basin.

       

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