[目的]溶洞的注浆处理是地铁隧道工程中的难点,施工时溶洞的不恰当处理极易引发事故,因此有必要对小型溶洞裂隙数量和注浆压强之间的关系进行研究。[方法]针对需注浆填充的城市小型非连通型溶洞(体积不大于8 m 3)的裂隙数量不确定问题,...[目的]溶洞的注浆处理是地铁隧道工程中的难点,施工时溶洞的不恰当处理极易引发事故,因此有必要对小型溶洞裂隙数量和注浆压强之间的关系进行研究。[方法]针对需注浆填充的城市小型非连通型溶洞(体积不大于8 m 3)的裂隙数量不确定问题,采用Fluent数值模拟软件中的多相流Mixture模型进行不同裂隙数量的溶洞注浆数值模拟,计算模拟注浆时,测试区的注浆压强随时间的变化情况,并与实际工程溶洞注浆压强数据进行对比分析。[结果及结论]对于体积不大于8 m 3的小型非连通型溶洞,其模拟注浆时测试区的注浆压强与裂隙数量呈平方反比关系,注浆压强随着裂隙数量的增加而降低;当裂隙面积达到0.048 m 2时,注浆压强不再降低;注浆压强随着裂隙位置的增高而降低。在实际工程中,可通过对比同类型体积不超过8 m 3小型非连通溶洞之间的注浆压强数据,判断溶洞的相对裂隙数量,调整与优化后续的注浆方案。展开更多
Submicron scale temperature sensors are crucial for a range of applications,particularly in micro and na-noscale environments.One promising solution involves the use of active whispering gallery mode(WGM)microresonato...Submicron scale temperature sensors are crucial for a range of applications,particularly in micro and na-noscale environments.One promising solution involves the use of active whispering gallery mode(WGM)microresonators.These resonators can be remotely excited and read out using free-space structures,simplifying the process of sensing.In this study,we present a submicron-scale temperature sensor with a remarkable sensitivity up to 185 pm/℃based on a trian-gular MAPbI3 nanoplatelet(NPL)laser.Notably,as temperature changes,the peak wavelength of the laser line shifts lin-early.This unique characteristic allows for precise temperature sensing by tracking the peak wavelength of the NPL laser.The optical modes are confined within the perovskite NPL,which measures just 85 nm in height,due to total internal reflec-tion.Our NPL laser boasts several key features,including a high Q of~2610 and a low laser threshold of about 19.8μJ·cm^(−2).The combination of exceptional sensitivity and ultra-small size makes our WGM device an ideal candidate for integration into systems that demand compact temperature sensors.This advancement paves the way for significant prog-ress in the development of ultrasmall temperature sensors,opening new possibilities across various fields.展开更多
文摘[目的]溶洞的注浆处理是地铁隧道工程中的难点,施工时溶洞的不恰当处理极易引发事故,因此有必要对小型溶洞裂隙数量和注浆压强之间的关系进行研究。[方法]针对需注浆填充的城市小型非连通型溶洞(体积不大于8 m 3)的裂隙数量不确定问题,采用Fluent数值模拟软件中的多相流Mixture模型进行不同裂隙数量的溶洞注浆数值模拟,计算模拟注浆时,测试区的注浆压强随时间的变化情况,并与实际工程溶洞注浆压强数据进行对比分析。[结果及结论]对于体积不大于8 m 3的小型非连通型溶洞,其模拟注浆时测试区的注浆压强与裂隙数量呈平方反比关系,注浆压强随着裂隙数量的增加而降低;当裂隙面积达到0.048 m 2时,注浆压强不再降低;注浆压强随着裂隙位置的增高而降低。在实际工程中,可通过对比同类型体积不超过8 m 3小型非连通溶洞之间的注浆压强数据,判断溶洞的相对裂隙数量,调整与优化后续的注浆方案。
文摘Submicron scale temperature sensors are crucial for a range of applications,particularly in micro and na-noscale environments.One promising solution involves the use of active whispering gallery mode(WGM)microresonators.These resonators can be remotely excited and read out using free-space structures,simplifying the process of sensing.In this study,we present a submicron-scale temperature sensor with a remarkable sensitivity up to 185 pm/℃based on a trian-gular MAPbI3 nanoplatelet(NPL)laser.Notably,as temperature changes,the peak wavelength of the laser line shifts lin-early.This unique characteristic allows for precise temperature sensing by tracking the peak wavelength of the NPL laser.The optical modes are confined within the perovskite NPL,which measures just 85 nm in height,due to total internal reflec-tion.Our NPL laser boasts several key features,including a high Q of~2610 and a low laser threshold of about 19.8μJ·cm^(−2).The combination of exceptional sensitivity and ultra-small size makes our WGM device an ideal candidate for integration into systems that demand compact temperature sensors.This advancement paves the way for significant prog-ress in the development of ultrasmall temperature sensors,opening new possibilities across various fields.
