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Junwei Z.,Southwest Petroleum University | Junwei Z.,Key Laboratory of Structure Engineering of Universities in Sichuan | Jinping L.,China Communications Construction Company Ltd. | Xiaojuan Q.,Southwest Jiaotong University
The Scientific World Journal | Year: 2013

The permafrost degradation is the fundamental cause generating embankment diseases and pavement diseases in permafrost region while the permafrost degradation is related with temperature. Based on the field monitoring results of ground temperature along G214 Highway in high temperature permafrost regions, both the ground temperatures in superficial layer and the annual average temperatures under the embankment were discussed, respectively, for concrete pavements and asphalt pavements. The maximum depth of temperature field under the embankment for concrete pavements and asphalt pavements was also studied by using the finite element method. The results of numerical analysis indicate that there were remarkable seasonal differences of the ground temperatures in superficial layer between asphalt pavement and concrete pavement. The maximum influencing depth of temperature field under the permafrost embankment for every pavement was under the depth of 8 m. The thawed cores under both embankments have close relation with the maximum thawed depth, the embankment height, and the service time. The effective measurements will be proposed to keep the thermal stabilities of highway embankment by the results. © 2013 Zhang Junwei et al. Source


Junwei Z.,Southwest Petroleum University | Yi Z.,Key Laboratory of Structure Engineering of Universities in Sichuan | Jinping L.,China Communications Construction Company Ltd. | Xiaojuan Q.,Southwest Jiaotong University
Electronic Journal of Geotechnical Engineering | Year: 2013

The evolution mechanism of cement concrete pavement diseases in high temperature permafrost is discussed in this paper to protect pavement from disease under the background of both G214 Highway and Mohe-Arctic Village Highway instigated. As the ground temperatures of permafrost in G214 Highway are higher, the cement concrete pavement mainly presents on the settlement deformation. The settlement deformation of cement concrete pavement caused unevenly transverse settlement of embankment. This is because of the unevenly transverse thermal distribution of the embankment. However, it is more interesting that the surface water and permafrost in Mohe-Arctic Village Highway is respectively more and thinner than in G214 Highway. The evolution mechanism of pavement diseases in Mohe-Arctic Village Highway is completely different from in G214 Highway. According to the field monitoring results of deformation and temperature along Mohe-Arctic Village Highway in permafrost regions of Northeast, the pavement diseases present not only the settlement deformation but also the frost heaving. The reason is that the deformation of embankment is mainly caused by the thermal field under the pavement with the original seasonal thawing and freezing layer changing. Source


Zhang J.,Southwest Petroleum University | Zhang J.,Key Laboratory of Structure Engineering of Universities in Sichuan | Mei Z.,Southwest Research Institute | Quan X.,Southwest Jiaotong University
Electronic Journal of Geotechnical Engineering | Year: 2013

The program of shield TBM + segment lining is mostly employed when the transfer water tunnels are excavated by TBM in China. The construction program of open TBM +composite lining of shotcrete support is selected in Dahuofang transfer water tunnel according to the conditions of mass rock and the program is carried out successfully. The support optimization system design of tunnel excavated by TBM, including the optimization of composite lining of shotcrete support substituting for segment lining, is realized in tunnel of Complex Mountain. The design of composite lining of shotcrete combined with TBM construction fully embodies the ideas of NATM (New Australian Tunnel Method). Dynamic design method has been taken in support construction at the same time. Support lining parameters have been adjusted and optimized timely according to past similar cases and insitu monitoring so as to achieve a rapid construction and save quantities of investment. The practice experiences of composite lining of shotcrete support will supply with reliable theory and practice in construction of TBM in the future. © 2013 ejge. Source


Zhang J.,Southwest Petroleum University | Zhang J.,Key Laboratory of Structure Engineering of Universities in Sichuan | Mei Z.,Southwest Research Institute | Quan X.,Southwest Jiaotong University
Electronic Journal of Geotechnical Engineering | Year: 2013

Wen-chuan earthquake has been the most destructive and the largest spreading region one in China since 1949. The heavy disaster area has exceeded 10,000 square kilometers. Earthquake magnitude of Ms 8.0 Wen-chuan earthquake exceeded the Ms 7.8 Tang-shan earthquake in 1976. The 18 tunnels damaged by Wen-chuan earthquake were investigated to study the causes of these damages for supplying seismic design of the tunnel. Tunnels have long been considered to have the ability to resist earthquakes with little damage. However, investigations of highway tunnels after Wenchuan Earthquake in Sichuan revealed that many highway tunnels suffered different extents of significant damage. This paper mainly discusses failure characteristics and influencing factors of highway tunnels damage due to the Chinese Wenchuan Earthquake. It was found that 17 of the 18 tunnels investigated were damaged. According to records of geological conditions, design documents, construction methods and maintenances on highway tunnels in Dujiangyan-Wenchuan highway, the damage patterns are summarized based on the characteristics and the distribution of the lining cracks. The results indicate that the damage degree of tunnels is closely relevant to fault zones, Epicenter and Seismic propagate, Geology condition, Depth and Structure of tunnel and Seismic capacity of the tunnel. © 2013, EJGE. Source


Zhang J.,Southwest Petroleum University | Zhang J.,Key Laboratory of Structure Engineering of Universities in Sichuan | Mei Z.,Southwest Research Institute | Quan X.,Southwest Jiaotong University
Electronic Journal of Geotechnical Engineering | Year: 2013

Segmental lining as standard practice in design and construction for a machine-bored tunnel become more and more serious increasingly in leakage problems presently. The composite lining consisting of sprayed concrete or shotcrete and final lining based on NATM theory was used by the engineers of China for a machine-bored tunnel and settled leakage problems better. Geological prediction technology making use of waves induced by TBM tunneling, continuous conveyor mucking technology, full ring-pass lining trolley, and invert lining trolley, ensure continuous excavation of open TBM. The monitoring results indicated that the design and construction for a machine-bored tunnel are quite reasonable. © 2013, EJGE. Source

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