透壁式通风管_块石复合路基降温效果模型试验及数值模拟_刘戈.pdfVIP

DOI 10.11779/CJGE201502011 – –3.5 2.5 m/s – 20% 2.2 – 4.06 m/s 101 – U416.1 A 2015 (1979 ) E-mail: liuge1994@ Model test and numerical simulation of cooling effect of ventilated duct-crashed rock composite embankment 1 1 2 1 1 LIU Ge , WANG Shuang-jie , SUN Hong , YUAN Kun , LI Jin-ping (1. CCCC First Highway Consultants Co., LTD, Xi’an 710075, China; 2. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China) Abstract: In order to study the cooling effect of ventilated duct-crashed rock composite embankment, a series of model tests are carried out under plateau environment conditions. The average annual temperature is -3.5 , the average wind speed is 2.5 m/s, and the dominant wind direction is northwest. The air convection velocity in crashed rock, the change process of temperature at feature points and the temperature field of model are analyzed. The results indicate that an enhanced convection effect in embankment can be generated by the ventilated duct-crashed rock composite embankment. Under the effect of grooming by the ventilated duct, the air convection velocity in the composite embankment is 20% higher than that in a single crashed rock embankment, and the cooling rate at t