The deformation and failure of mining slopes in layered rocks predominantly result from shear landslides.However,the instability process of the Pusa rock avalanche in Guizhou,China,revealed a unique damage phenomenon:...The deformation and failure of mining slopes in layered rocks predominantly result from shear landslides.However,the instability process of the Pusa rock avalanche in Guizhou,China,revealed a unique damage phenomenon:prominent breaking and toppling of rock blocks occurred in the central section of the mountain,with a lack of commonly observed shear landslide features.This paper aims to investigate the underlying reasons behind this distinctive damage pattern.The study employs various methods including geological survey,UAV aerial survey,physical simulation,and discrete element numerical simulation.The findings indicate that the geological conditions,characterized by a hard upper layer and a soft lower layer along with underground mining activities,play a significant role in triggering the landslide.Furthermore,the presence of a columnar structured rock mass emerges as the primary factor influencing the instability of the Pusa rock avalanche.To elucidate the mining failure mechanism of the rock mass with vertical joints,we propose a"subsidence-buckling"failure model.Following the subsidence and collapse of the roof rock mass in the goaf,the columnar rock mass in the upper and middle portions of the slope undergoes deflection and deformation,forming a three-hinged arch structure.This structural configuration converts the pressure exerted by the overlying rock mass into both vertical pressure and lateral thrust.Under the influence of external loads,the slope experiences buckling failure,ultimately leading to instability upon fragmentation.By shedding light on these findings,this study contributes to a better understanding of the spatiotemporal evolution of mining slope fractures and their impact on slope stability.展开更多
【目的】为获得白芷转录组序列信息,了解不同产地间白芷的差异表达基因情况。【方法】以白芷根为研究对象,采用Illumina HiSeq X Ten平台对不同产地白芷进行高通量转录组测序,并对其差异表达基因进行筛选和分析。【结果】川白芷产地间...【目的】为获得白芷转录组序列信息,了解不同产地间白芷的差异表达基因情况。【方法】以白芷根为研究对象,采用Illumina HiSeq X Ten平台对不同产地白芷进行高通量转录组测序,并对其差异表达基因进行筛选和分析。【结果】川白芷产地间、亳白芷产地间及川白芷与亳白芷间的差异基因总数分别为2686、1704、11549条,分别被GO富集注释11038、434、5604条,差异基因的主要功能与细胞组成、细胞、细胞器、结合、催化活性、细胞过程及代谢过程有关。KEGG通路分类显示,差异表达基因被分为4大类,24个小类,所在通路主要与代谢过程相关。与白芷主要化学成分香豆素和挥发油合成相关的4-香豆酸连接酶、丙氨酸氨解酶、3-羟基-3-甲基戊二酰辅酶A还原酶在川白芷中表达量升高,1-脱氧-D-木糖-5-磷酸合成酶、脱氢多萜醇焦磷酸合成酶在川白芷中表达量降低。【结论】通过转录组测序分析了不同产地白芷根基因差异表达状况,为白芷药材道地性品质的形成提供了理论依据。展开更多
基金funded by the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project(SKLGP2022Z001)National Natural Science Foundation of China(Grant No.41877273)+3 种基金Science and Technology Plan Project of Sichuan Province(Grant No.2021YJ0053)Sichuan Natural Science Foundation(Grant No.2022NSFSC1176)Innovative Research Groups of the National Natural Science Foundation of China(Grant No.41521002)POWERCHINA Science and technology project(Grant No.DJ-ZDXM-2020-03)。
文摘The deformation and failure of mining slopes in layered rocks predominantly result from shear landslides.However,the instability process of the Pusa rock avalanche in Guizhou,China,revealed a unique damage phenomenon:prominent breaking and toppling of rock blocks occurred in the central section of the mountain,with a lack of commonly observed shear landslide features.This paper aims to investigate the underlying reasons behind this distinctive damage pattern.The study employs various methods including geological survey,UAV aerial survey,physical simulation,and discrete element numerical simulation.The findings indicate that the geological conditions,characterized by a hard upper layer and a soft lower layer along with underground mining activities,play a significant role in triggering the landslide.Furthermore,the presence of a columnar structured rock mass emerges as the primary factor influencing the instability of the Pusa rock avalanche.To elucidate the mining failure mechanism of the rock mass with vertical joints,we propose a"subsidence-buckling"failure model.Following the subsidence and collapse of the roof rock mass in the goaf,the columnar rock mass in the upper and middle portions of the slope undergoes deflection and deformation,forming a three-hinged arch structure.This structural configuration converts the pressure exerted by the overlying rock mass into both vertical pressure and lateral thrust.Under the influence of external loads,the slope experiences buckling failure,ultimately leading to instability upon fragmentation.By shedding light on these findings,this study contributes to a better understanding of the spatiotemporal evolution of mining slope fractures and their impact on slope stability.
文摘【目的】为获得白芷转录组序列信息,了解不同产地间白芷的差异表达基因情况。【方法】以白芷根为研究对象,采用Illumina HiSeq X Ten平台对不同产地白芷进行高通量转录组测序,并对其差异表达基因进行筛选和分析。【结果】川白芷产地间、亳白芷产地间及川白芷与亳白芷间的差异基因总数分别为2686、1704、11549条,分别被GO富集注释11038、434、5604条,差异基因的主要功能与细胞组成、细胞、细胞器、结合、催化活性、细胞过程及代谢过程有关。KEGG通路分类显示,差异表达基因被分为4大类,24个小类,所在通路主要与代谢过程相关。与白芷主要化学成分香豆素和挥发油合成相关的4-香豆酸连接酶、丙氨酸氨解酶、3-羟基-3-甲基戊二酰辅酶A还原酶在川白芷中表达量升高,1-脱氧-D-木糖-5-磷酸合成酶、脱氢多萜醇焦磷酸合成酶在川白芷中表达量降低。【结论】通过转录组测序分析了不同产地白芷根基因差异表达状况,为白芷药材道地性品质的形成提供了理论依据。
