Understanding the deterioration behaviors and mechanisms of rocks under thermo-hydromechanical(THM)interactions is crucial for mitigating slope instability.In this study,the physicomechanical properties of silty mudst...Understanding the deterioration behaviors and mechanisms of rocks under thermo-hydromechanical(THM)interactions is crucial for mitigating slope instability.In this study,the physicomechanical properties of silty mudstone subjected to THM interactions were investigated by triaxial tests.The underlying micro-mechanisms were revealed using microscopic tests.The triaxial test results indicate that the strength parameters of silty mudstone decrease by 89.50%(deformation modulus),78.15%(peak strength),70.58%(cohesion),and 48.65%(friction angle)under 16 THM cycles,a load of 300 kPa,and alternating between 0℃water immersion and 60℃drying.The SEM test results indicate that the deterioration of silty mudstone strength primarily results from hydrothermal-expansion softening and cracking driven by the TLHM interactions.The specimens manifest shear failure under confining pressure exceeding 140 kPa.Furthermore,a new constitutive model considering hydrothermalexpansion strain and non-linear deformation characteristics was developed.The discrepancy between the experimentally measured peak strength and the damage constitutive model prediction remains below 5%.The proposed model is verified to be in satisfactory agreement with the experimental results.The self-designed THM apparatus overcomes the limitations of traditional investigations,enabling simultaneous consideration of thermal,hydraulic,and mechanical interactions.展开更多
目的了解后疫情时期综合医院在院患者肺结核流行病学变化特征,为今后江西省结核防控新模式探索提供参考依据。方法收集2020至2022年江西某三甲医院肺结核患者传染病报卡信息,采用GeoDa1.22软件行空间自相关分析,采用SPSS 22.0、Excel 2...目的了解后疫情时期综合医院在院患者肺结核流行病学变化特征,为今后江西省结核防控新模式探索提供参考依据。方法收集2020至2022年江西某三甲医院肺结核患者传染病报卡信息,采用GeoDa1.22软件行空间自相关分析,采用SPSS 22.0、Excel 2019软件完成报告发病率计算、三间分布分析、结果可视化。结果3年共计收集报告肺结核患者2327例,男女比2.31,平均年龄57(46,69)岁,年均报告发病率为81.65/万,病原学阳性报告发病率占比逐年上升(χ^(2) for trend=8.760,P<0.001),报告发病率在男性不同年龄段占比差异有统计学意义(χ^(2) males=22.560,P=0.012)。全局Moran s I指数为-0.022~-0.046(P=0.290~0.370),局部聚集热点主要在南昌市、抚州市、宜春市。2020、2021年以冬季为报告高峰,2022年秋季为报告高峰。结论未来应持续关注高危人群、空间地理风险预警、提高入院筛查率及探索综合医院患者就诊习惯等角度,探索符合江西省情况的医院肺结核感染防控新模式。展开更多
基金supported by“the National Natural Science Foundation of China(52378440,52078067,52078066,42477143,52408458)the Key Science and Technology Program in the Transportation Industry(2022-MS1-032,2022-MS5-125)+4 种基金the Natural Science Foundation of Hunan Province(2023JJ10045)the Outstanding Innovative Youth Training Program of Changsha City(kq2305023)Scientific Research Foundation of Hunan Provincial Education Department(24B0292)Water Resources Science and Technology Project of Hunan Province(XSKJ2023059-41)the Guangxi Key Research and Development Program(AB23075184)。
文摘Understanding the deterioration behaviors and mechanisms of rocks under thermo-hydromechanical(THM)interactions is crucial for mitigating slope instability.In this study,the physicomechanical properties of silty mudstone subjected to THM interactions were investigated by triaxial tests.The underlying micro-mechanisms were revealed using microscopic tests.The triaxial test results indicate that the strength parameters of silty mudstone decrease by 89.50%(deformation modulus),78.15%(peak strength),70.58%(cohesion),and 48.65%(friction angle)under 16 THM cycles,a load of 300 kPa,and alternating between 0℃water immersion and 60℃drying.The SEM test results indicate that the deterioration of silty mudstone strength primarily results from hydrothermal-expansion softening and cracking driven by the TLHM interactions.The specimens manifest shear failure under confining pressure exceeding 140 kPa.Furthermore,a new constitutive model considering hydrothermalexpansion strain and non-linear deformation characteristics was developed.The discrepancy between the experimentally measured peak strength and the damage constitutive model prediction remains below 5%.The proposed model is verified to be in satisfactory agreement with the experimental results.The self-designed THM apparatus overcomes the limitations of traditional investigations,enabling simultaneous consideration of thermal,hydraulic,and mechanical interactions.
文摘目的了解后疫情时期综合医院在院患者肺结核流行病学变化特征,为今后江西省结核防控新模式探索提供参考依据。方法收集2020至2022年江西某三甲医院肺结核患者传染病报卡信息,采用GeoDa1.22软件行空间自相关分析,采用SPSS 22.0、Excel 2019软件完成报告发病率计算、三间分布分析、结果可视化。结果3年共计收集报告肺结核患者2327例,男女比2.31,平均年龄57(46,69)岁,年均报告发病率为81.65/万,病原学阳性报告发病率占比逐年上升(χ^(2) for trend=8.760,P<0.001),报告发病率在男性不同年龄段占比差异有统计学意义(χ^(2) males=22.560,P=0.012)。全局Moran s I指数为-0.022~-0.046(P=0.290~0.370),局部聚集热点主要在南昌市、抚州市、宜春市。2020、2021年以冬季为报告高峰,2022年秋季为报告高峰。结论未来应持续关注高危人群、空间地理风险预警、提高入院筛查率及探索综合医院患者就诊习惯等角度,探索符合江西省情况的医院肺结核感染防控新模式。
