Based on investigating the present greening situation of 18 overpasses in the urban area of Kunming City,4 typical plant furnishing modes for overpass were concluded,that is,Type Ⅰ,which was the multi-layered plant d...Based on investigating the present greening situation of 18 overpasses in the urban area of Kunming City,4 typical plant furnishing modes for overpass were concluded,that is,Type Ⅰ,which was the multi-layered plant disposition pattern composed of all arbor,shrub and herbaceous plant species;TypeⅡ,which was mainly composed of shrub and herbaceous species with a 2-layered structure;Type Ⅲ was the turf grass pattern with sparsely disposed trees;Type Ⅳ,which was the simple groundcover greening pattern.1 or 2 typical overpasses from each type were sampled separately for evaluating the landscape effects of the typical green space around each type of overpass by adopting AHP model,and the results showed that the evaluated landscape effect of Type Ⅰ was 'good',that of Type Ⅱ was 'moderate',that of Type Ⅲ was 'moderate to good',and that of Type Ⅳ was 'poor'.展开更多
To analyze the characteristics of ground vibration caused by blasting demolition of urban overpass, in this paper we introduced the measurement method and then studied the characteristics of recorded ground vi- bratio...To analyze the characteristics of ground vibration caused by blasting demolition of urban overpass, in this paper we introduced the measurement method and then studied the characteristics of recorded ground vi- brations. Through the analysis of peak acceleration, peak frequency and duration, results indicated that the ver- tical component of vibration is the most important in the region close to the collapse point; the collapse of bridge segments will lead to superposition of ground vibration, and isolation measures can reduce the peak ac- celeration but increase the duration of vibration; blasting and collapse vibration cause no damage to the re- served structure which indicates that blastin~ demolition is a safe and effective method.展开更多
In order to improve the efficiency of overpass and the safety level of pedestrian, this paper aims to investigate the contributing factors for selective preference of overpass. Eight overpasses were investigated in Xi...In order to improve the efficiency of overpass and the safety level of pedestrian, this paper aims to investigate the contributing factors for selective preference of overpass. Eight overpasses were investigated in Xi＇an, and a questionnaire was conducted by the pedestrians near the overpass. Totally, 1131 valid samples （873 used of overpasses and 258 non-used of overpasses） were collected. Based on the data, a binary logit （BL） model was developed to identify what and how the factors affect the selective preference of overpass. The BL model was calibrated by the maximum likelihood method. Likelihood ratio test and McFadden-R2 were used to analyze the goodness-of-fit of the model. The results show that the BL model has a reasonable goodness-of-fit, and the prediction accuracy of the BL model can reach 81.9%. The BL model showed that the selective preference of overpass was signifi- cantly influenced by eight factors, including gender, age, career, education level, license, detour wishes, detour distance, and crossing time. Besides, the odds ratios of significant factors were also analyzed to explain the impacts of the factors on selective preference of overpass.展开更多
The overpass at Dongbianmen was opened to the public in 1988. Its design and construction were difficult because the ancient buildings nearby needed to be protected. The design was complicated because a highway, a rai...The overpass at Dongbianmen was opened to the public in 1988. Its design and construction were difficult because the ancient buildings nearby needed to be protected. The design was complicated because a highway, a railway and a river intersect here.展开更多
In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production...In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production,the separate transportation mode of underpass bridge and overpass steel trestle is proposed to optimize the open pit development transportation system,so as to solve the practical problems that the horizontal cross of transport vehicles causes vehicle blockage,affects production schedule and production safety.The results show that the horizontal crossing road can be changed into a separate type of overpass steel trestle,which can realize the classified transportation of large and small vehicles,reduce the traffic density,make vehicles with different functions go their own way,eliminate the hidden danger of traffic accidents,and improve the production efficiency.展开更多
文摘Based on investigating the present greening situation of 18 overpasses in the urban area of Kunming City,4 typical plant furnishing modes for overpass were concluded,that is,Type Ⅰ,which was the multi-layered plant disposition pattern composed of all arbor,shrub and herbaceous plant species;TypeⅡ,which was mainly composed of shrub and herbaceous species with a 2-layered structure;Type Ⅲ was the turf grass pattern with sparsely disposed trees;Type Ⅳ,which was the simple groundcover greening pattern.1 or 2 typical overpasses from each type were sampled separately for evaluating the landscape effects of the typical green space around each type of overpass by adopting AHP model,and the results showed that the evaluated landscape effect of Type Ⅰ was 'good',that of Type Ⅱ was 'moderate',that of Type Ⅲ was 'moderate to good',and that of Type Ⅳ was 'poor'.
文摘To analyze the characteristics of ground vibration caused by blasting demolition of urban overpass, in this paper we introduced the measurement method and then studied the characteristics of recorded ground vi- brations. Through the analysis of peak acceleration, peak frequency and duration, results indicated that the ver- tical component of vibration is the most important in the region close to the collapse point; the collapse of bridge segments will lead to superposition of ground vibration, and isolation measures can reduce the peak ac- celeration but increase the duration of vibration; blasting and collapse vibration cause no damage to the re- served structure which indicates that blastin~ demolition is a safe and effective method.
基金sponsored by the National Natural Science Foundation of China(No.51178108)the Scientific Research Foundation of Graduate School of Southeast University(No.YBJJ1458)the Fundamental Research Funds for the Central Universities and the Scientific Innovation Research of College Graduates in Jiangsu Province(Nos.KYLX_0173,KYLX_0174)
文摘In order to improve the efficiency of overpass and the safety level of pedestrian, this paper aims to investigate the contributing factors for selective preference of overpass. Eight overpasses were investigated in Xi＇an, and a questionnaire was conducted by the pedestrians near the overpass. Totally, 1131 valid samples （873 used of overpasses and 258 non-used of overpasses） were collected. Based on the data, a binary logit （BL） model was developed to identify what and how the factors affect the selective preference of overpass. The BL model was calibrated by the maximum likelihood method. Likelihood ratio test and McFadden-R2 were used to analyze the goodness-of-fit of the model. The results show that the BL model has a reasonable goodness-of-fit, and the prediction accuracy of the BL model can reach 81.9%. The BL model showed that the selective preference of overpass was signifi- cantly influenced by eight factors, including gender, age, career, education level, license, detour wishes, detour distance, and crossing time. Besides, the odds ratios of significant factors were also analyzed to explain the impacts of the factors on selective preference of overpass.
文摘The overpass at Dongbianmen was opened to the public in 1988. Its design and construction were difficult because the ancient buildings nearby needed to be protected. The design was complicated because a highway, a railway and a river intersect here.
文摘In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production,the separate transportation mode of underpass bridge and overpass steel trestle is proposed to optimize the open pit development transportation system,so as to solve the practical problems that the horizontal cross of transport vehicles causes vehicle blockage,affects production schedule and production safety.The results show that the horizontal crossing road can be changed into a separate type of overpass steel trestle,which can realize the classified transportation of large and small vehicles,reduce the traffic density,make vehicles with different functions go their own way,eliminate the hidden danger of traffic accidents,and improve the production efficiency.
