A novel and simple fiber grating sensor based on high-duty-cyclesample fiber bragg grating is proposed and demonstratedexperimentally. This type of sensor can measure strain andtemperature simultaneously with merits o...A novel and simple fiber grating sensor based on high-duty-cyclesample fiber bragg grating is proposed and demonstratedexperimentally. This type of sensor can measure strain andtemperature simultaneously with merits of low cost, high sensitivityand immunity to electro- magnetic interference. The sensor has anaccuracy of 20 με and 0.8 deg.C over a strain range of 500～1 500 με and a temperature range of 5～36 deg.C under experimentalconditions.展开更多
针对湖南省四种不同塑性指数(PI)的路基软土,在控制无侧限抗压强度(UCS)为350 k Pa和700k Pa的条件下,研究了采用粉煤灰、石灰、水泥三种无机结合料进行改良的配比组合方案,并对改良土进行了循环加载试验以评价其动力性能(如回弹模量和...针对湖南省四种不同塑性指数(PI)的路基软土,在控制无侧限抗压强度(UCS)为350 k Pa和700k Pa的条件下,研究了采用粉煤灰、石灰、水泥三种无机结合料进行改良的配比组合方案,并对改良土进行了循环加载试验以评价其动力性能(如回弹模量和累积塑性应变)。研究结果表明,各种结合料组合对提高USC的效果排名为:(石灰+水泥)>水泥>(石灰+粉煤灰)>粉煤灰>石灰,为达到目标UCS,土的塑性指数越大,则改良所需的结合料组合排名越靠前。由于素土类型和改良方案的区别,UCS相近的改良土可能呈现较大差异的回弹模量。在同一UCS控制条件下,改良土回弹模量总体随着水/结合料比例的减小而提高,而累积塑性应变则总体随着该比例的减小而降低,回弹模量、累积塑性应变均与土的PI无明显相关性,在7 d的基础上适当延长养护时间可以有效提高回弹模量,在实际工程中,利用改良土应重视压实后的养护工作。展开更多
According to domestic media, Dali Town,which accounted for nearly one third of domestic total output of aluminum products,has started the energy-saving and emission-reducing campaign since last July.
文摘A novel and simple fiber grating sensor based on high-duty-cyclesample fiber bragg grating is proposed and demonstratedexperimentally. This type of sensor can measure strain andtemperature simultaneously with merits of low cost, high sensitivityand immunity to electro- magnetic interference. The sensor has anaccuracy of 20 με and 0.8 deg.C over a strain range of 500～1 500 με and a temperature range of 5～36 deg.C under experimentalconditions.
文摘针对湖南省四种不同塑性指数(PI)的路基软土,在控制无侧限抗压强度(UCS)为350 k Pa和700k Pa的条件下,研究了采用粉煤灰、石灰、水泥三种无机结合料进行改良的配比组合方案,并对改良土进行了循环加载试验以评价其动力性能(如回弹模量和累积塑性应变)。研究结果表明,各种结合料组合对提高USC的效果排名为:(石灰+水泥)>水泥>(石灰+粉煤灰)>粉煤灰>石灰,为达到目标UCS,土的塑性指数越大,则改良所需的结合料组合排名越靠前。由于素土类型和改良方案的区别,UCS相近的改良土可能呈现较大差异的回弹模量。在同一UCS控制条件下,改良土回弹模量总体随着水/结合料比例的减小而提高,而累积塑性应变则总体随着该比例的减小而降低,回弹模量、累积塑性应变均与土的PI无明显相关性,在7 d的基础上适当延长养护时间可以有效提高回弹模量,在实际工程中,利用改良土应重视压实后的养护工作。
文摘According to domestic media, Dali Town,which accounted for nearly one third of domestic total output of aluminum products,has started the energy-saving and emission-reducing campaign since last July.
