Considering the only retaining structure L-type retaining wall used in Golmud-Lhasa sectionofQinghai-Tibet Railway, the earth pressure and frost-heavingforce was tested in a frost-thaw circle for one year, and several...Considering the only retaining structure L-type retaining wall used in Golmud-Lhasa sectionofQinghai-Tibet Railway, the earth pressure and frost-heavingforce was tested in a frost-thaw circle for one year, and several different analysis models were studied.Comparedwith site test and theory analysis, it was found that the actual earth pressure is much larger than the designedearth pressure. Hence, a revised analysis model of earth pressure is put forward, which could include another possible force except slide triangle or frost heaving force. The model in this paper is only consider the thrust force other than failure sliding wedge.This model could be used as reference for the design and construction of similar projects.展开更多
Eight monitoring sites are set along the Qinghai-Xizang Highway (QXH) to investigate the characteristics and process of interaction between permafrost and highway, including the up-per and down boundaries of active la...Eight monitoring sites are set along the Qinghai-Xizang Highway (QXH) to investigate the characteristics and process of interaction between permafrost and highway, including the up-per and down boundaries of active layer under natural surface, seasonally freezing-thawing depth under asphalt pavement, permafrost table temperature and roadbed stability. The investigation results show that the changes of active layer thickness and permafrost table temperature under asphalt pavement are greater than these under natural surface due to the absorbing heat action and less evaporation of asphalt pavement, as a result, the engineering geological problems such as thaw settlement and frost heave present frequently along QXH line and produce the adverse impact on roadbed stability.展开更多
文摘Considering the only retaining structure L-type retaining wall used in Golmud-Lhasa sectionofQinghai-Tibet Railway, the earth pressure and frost-heavingforce was tested in a frost-thaw circle for one year, and several different analysis models were studied.Comparedwith site test and theory analysis, it was found that the actual earth pressure is much larger than the designedearth pressure. Hence, a revised analysis model of earth pressure is put forward, which could include another possible force except slide triangle or frost heaving force. The model in this paper is only consider the thrust force other than failure sliding wedge.This model could be used as reference for the design and construction of similar projects.
基金the National Natural Science Foundation of China (Grant No. 90102006) Key Project of CAS(KZCX-SW-04) the Innovation Project of CAREERI (CACX210047 and CACX210086) and Post Doctoral Fund of Nanjing Unive
文摘Eight monitoring sites are set along the Qinghai-Xizang Highway (QXH) to investigate the characteristics and process of interaction between permafrost and highway, including the up-per and down boundaries of active layer under natural surface, seasonally freezing-thawing depth under asphalt pavement, permafrost table temperature and roadbed stability. The investigation results show that the changes of active layer thickness and permafrost table temperature under asphalt pavement are greater than these under natural surface due to the absorbing heat action and less evaporation of asphalt pavement, as a result, the engineering geological problems such as thaw settlement and frost heave present frequently along QXH line and produce the adverse impact on roadbed stability.
