为了有效监测贵州西部地区因长期进行地下采矿引起的地面持续性沉降,本文以纳雍县中岭煤矿区为研究区,基于SBAS-InSAR技术,对覆盖其范围的91期Sentinenl-1A升轨影像(2019—2021年间),利用SVD奇异值准则获取了观测时段内的地面沉降范围...为了有效监测贵州西部地区因长期进行地下采矿引起的地面持续性沉降,本文以纳雍县中岭煤矿区为研究区,基于SBAS-InSAR技术,对覆盖其范围的91期Sentinenl-1A升轨影像(2019—2021年间),利用SVD奇异值准则获取了观测时段内的地面沉降范围和深度,进行了时序分析,通过采煤工作面和野外调查等手段,验证了监测结果的准确性与可靠性。结果表明:(1)在观测时段内,在研究区共探查到3处典型持续沉降中心,其视线向(Line of sight,LOS)年平均形变速率变化范围在31.92-48.56 mm·a^(-1),最大沉降速率达到-48.56 mm·a^(-1);(2)通过分析认为,研究区形变特征符合采矿沉陷规律,且随着时间的累积,沉降变形从起初不明显到变化剧烈,再到逐渐趋于稳定过程,其范围特征呈东西向延伸,渐有合并趋势,并不断向南北向扩张。从验证情况分析,认为基于SBAS-InSAR技术获取的地面沉降信息可靠,准确率达85%以上,可为矿山安全开采、沉降灾害的预治提供参考。展开更多
In this paper,the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal theory.The following results were achieved.1...In this paper,the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal theory.The following results were achieved.1)According to the results of volume and surface fractal dimension,meso-pores can be classified into Mep-1,Mep-2,and Mep-3,respectively.Micro-pore can be classified into Mip-1,Mip-2,and Mip-3,respectively.2)Pore types play an important role in affecting the heterogeneity of meso-pores.The volume heterogeneity(VHY)of Mep-1 is simpler than that of Mep-2 and Mep-3 in type A samples.However,the VHY of Mep-1 becomes gradually larger than that of Mep-2 and Mep-3 from type A to type B and C.The VHY of open pore in the same diameter is higher than that of semi-open or closed pore.Meanwhile,the surface heterogeneity(SHY)of types A and B samples is significantly larger than that of type C,the SHY of semi-open or closed pores is more complicated than that of open pores.3)Coal rank mainly affects the heterogeneity of micro-pores.The heterogeneity of type A is always smaller than that of type B and C.The VHY of Mip-1 is more complicated than that of Mip-2 and Mip-3 in the same samples,and the sensitivity of the VHY of Mip-1 and Mip-2 to the degree of coal rank is smaller than that of Mip-3.Meanwhile,the SHY of Mip-1 and Mip-2 is simpler than that of Mip-3 in the same sample,the SHY of micro-pores remains stable as the pore size decreases,and the affect of coalification level on SHY decreases with the decrease in pore diameter.Full-scale fractal characterization has enabled quantitative characterization of adsorption pore properties and provided useful information with regards to the similarity of pore features in different coal reservoirs.展开更多
文摘为了有效监测贵州西部地区因长期进行地下采矿引起的地面持续性沉降,本文以纳雍县中岭煤矿区为研究区,基于SBAS-InSAR技术,对覆盖其范围的91期Sentinenl-1A升轨影像(2019—2021年间),利用SVD奇异值准则获取了观测时段内的地面沉降范围和深度,进行了时序分析,通过采煤工作面和野外调查等手段,验证了监测结果的准确性与可靠性。结果表明:(1)在观测时段内,在研究区共探查到3处典型持续沉降中心,其视线向(Line of sight,LOS)年平均形变速率变化范围在31.92-48.56 mm·a^(-1),最大沉降速率达到-48.56 mm·a^(-1);(2)通过分析认为,研究区形变特征符合采矿沉陷规律,且随着时间的累积,沉降变形从起初不明显到变化剧烈,再到逐渐趋于稳定过程,其范围特征呈东西向延伸,渐有合并趋势,并不断向南北向扩张。从验证情况分析,认为基于SBAS-InSAR技术获取的地面沉降信息可靠,准确率达85%以上,可为矿山安全开采、沉降灾害的预治提供参考。
基金sponsored by the Major National Science and Technology Projects(No.2016ZX05044002003)the Fundamental Research Funds for the Central Universities(No.2017CXNL03)the Surface well placement optimization via the topology analysis of well spatial form(41402291)。
文摘In this paper,the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal theory.The following results were achieved.1)According to the results of volume and surface fractal dimension,meso-pores can be classified into Mep-1,Mep-2,and Mep-3,respectively.Micro-pore can be classified into Mip-1,Mip-2,and Mip-3,respectively.2)Pore types play an important role in affecting the heterogeneity of meso-pores.The volume heterogeneity(VHY)of Mep-1 is simpler than that of Mep-2 and Mep-3 in type A samples.However,the VHY of Mep-1 becomes gradually larger than that of Mep-2 and Mep-3 from type A to type B and C.The VHY of open pore in the same diameter is higher than that of semi-open or closed pore.Meanwhile,the surface heterogeneity(SHY)of types A and B samples is significantly larger than that of type C,the SHY of semi-open or closed pores is more complicated than that of open pores.3)Coal rank mainly affects the heterogeneity of micro-pores.The heterogeneity of type A is always smaller than that of type B and C.The VHY of Mip-1 is more complicated than that of Mip-2 and Mip-3 in the same samples,and the sensitivity of the VHY of Mip-1 and Mip-2 to the degree of coal rank is smaller than that of Mip-3.Meanwhile,the SHY of Mip-1 and Mip-2 is simpler than that of Mip-3 in the same sample,the SHY of micro-pores remains stable as the pore size decreases,and the affect of coalification level on SHY decreases with the decrease in pore diameter.Full-scale fractal characterization has enabled quantitative characterization of adsorption pore properties and provided useful information with regards to the similarity of pore features in different coal reservoirs.
