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Zhang S.,Tianjin Institute of Urban Construction | Liu H.,Tianjin Institute of Urban Construction | Wang Y.,Tianjin Architecture Design Institute
Advanced Materials Research | Year: 2013

By studying the entries of Solar Decathlon Europe 2010, the thesis sums up the new trends of green building's skin materials, which are adjustable building skin materials, innovative application of traditional materials, solar skin integrated with architecture, regional context and aesthetic expression of the building skin materials. It is expected that the study can provide some reference and inspiration for the development of green building. © (2013) Trans Tech Publications, Switzerland.


Li R.,Tianjin University | Liu R.,Tianjin University | Xu Y.,Tianjin Architecture Design Institute | Lin M.-B.,Tianjin University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

Vehicle bumping at bridge head is a common quality problem in highway construction on soft soil foundation. Reasonable transition of flexible and rigid foundations is the core of solving this problem. On the basis of summarizing the relavent research results, the cement-mixing-pile-foundation treatment scheme adopted in the connection area of bridge and highway project in Tianjin is simulated by ABAQUS. The influences of treatment scope, gradient of pile length and variable pile length on eliminating the first and second vehicle bumpings are analyzed. The results show that cement mixing pile method is very effective in eliminating the vehicle bumping at bridge head. With the enlargement of the length of treatment scope, differential settlement also increases slightly, but the vehicle bumping at the section between the treated and untreated area can be alleviated. The increase of the pile length ratio in the highway extension direction will alleviate the vehicle bumping both at bridge head and in the section between treated and untreated areas. The increase of the length of cement mixing pile will aggravate the vehicle bumping at the section between the treated and untreated areas.


Sun L.-Q.,Tianjin University | Yan S.-W.,Tianjin University | Xu Y.,Tianjin Architecture Design Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The deformation is the dominant factor of the quality of the road constructed on the soft soil foundation. Tianjin Dongjiang port is located on the hydraulic filled soil foundation which is improved by using vacuum preloading method. Roads in this area often suffer wave type asymmetry settlement, which seriously affects the usage of the road and causes damage to both vehicles and human being. It is found that the initial wave asymmetry deformation of the road on very soft soil foundation is usually existing and will be developing continuously under the traffic load. The mechanism of the wavy failure of the road is discussed by establishing a mechanical model. The method of using geogrids to reduce the asymmetry deformation is proposed; the reinforcing effect is analyzed using finite element method.


Liu R.,Tianjin University | Li B.,Tianjin University | Wang H.-B.,Tianjin University | Zhang J.,Tianjin University | Xu Y.,Tianjin Architecture Design Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

In-service hydrocarbons must be transported at high temperature and pressure to ease the flow and prevent solidification of the wax fraction. The buckling of submarine pipelines occurs due to the introduction of axial compressive forces caused by the constrained expansions set up by thermal and internal pressure actions. Vertical buckling is particularly of interest with respect to buried submarine pipelines. To lay pipeline in trench with a certain depth is an effective measure to avoid vertical thermal upheaval buckling. Therefore, it is very important that study of the maximum resistance which soil can provide as well as the soil resistance changing procedure with the pipeline buckling amplitude. Fine sand was chosen as the soil medium in view of Bohai Gulf conditions. A model test was carried out to establish the relationship between soil resistance and pipeline displacement in laboratory. The pipeline segments with different diameters and different covered depths were used in the test. The soil resistance and the pipe segments vertical displacement were both recorded in great details. Then the numerical analyzing methodology was applied to simulate the model test procedure. Test data and analyzing results show that when the pipeline doing vertical uplift movement, process of soil resistance exertion can be affected by the buried rate of pipeline, when the buried rate is small, soil resistance decreases until stable after reaching peak; while when buried rate is large, the soil resistance doesn't significantly reduced after its peak. In the practice, the maximum soil resistance can be gained when the pipeline upward displacement reaches to approximate 0.1D.


Zheng G.,Tianjin University | Du Y.-M.,Tianjin University | Diao Y.,Tianjin University | Deng X.,Tianjin Architecture Design Institute | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

The unloading effect of excavations can cause deformation of the adjacent existing tunnels, which may seriously influence the operation and safety of the tunnels and hence should be strictly controlled. Based on the field measurements of a project in Tianjin and a large number of case histories, the finite element method considering the small strain of soil is adopted to conduct parametric studies on the relationship between the deformation of the existing tunnels and the excavation construction. According to various deformation controlling criteria for the existing tunnels, the retaining side of excavation is zoned with different deflection modes and maximum horizontal displacements of retaining structures. It is shown that the influenced zone can be simply characterized by a right trapezoid, which can be used to predict the deformation of the existing tunnels approximately according to the relative locations of the tunnels, deflection modes and maximum horizontal displacements of retaining structures. For a given deflection mode of the retaining structures and a deformation controlling criterion, the influenced zone expands as the maximum horizontal displacement of the retaining structure increases. Under the same criteria and maximum horizontal displacement of the retaining structures, the range of the influenced zone increases with the variation of deflection modes in the order of cantilever type, convex type, composite type and kick-in type. © 2016, Chinese Society of Civil Engineering. All right reserved.


Liu H.,Tianjin University | Liu B.,Tianjin University | Li X.,Tianjin Architecture Design Institute
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

In order to study the pressure loss of Trifluoromethane fire-extinguishing system, on the basis of experimental and theoretical analysis, the CFD simulation and the pressure loss calculation have been proposed and established, and then the new formula was gotten and then verified through experiments .The results show that the method of pressure loss calculation based on CFD, is visual, high reliable, and can more accurately describe the pressure loss.


Zheng G.,Tianjin University | Wang Q.,Tianjin University | Deng X.,Tianjin Architecture Design Institute | Liu Q.-C.,Tianjin Architecture Design Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

If the confined aquifer is not completely cut off by the diaphragm wall during the pressure-relief process which is used for preventing the heave failure of deep excavation, the sphere of influence of ground settlement caused by pressure-relief of confined aquifer is much larger than that caused by the excavation. Therefore, the deformation characteristics of the existing shield tunnels caused by pressure-relief of confined aquifer are simulated by finite element method; and then the diaphragm wall is inserted into the confined aquifer, the effect of the length of diaphragm wall into the confined aquifer on the deformation of tunnel is analyzed. The results show that, as the length of diaphragm wall inserted into the confined aquifer increases, the settlement of tunnel decreases. But because of the deformation of wall, horizontal movement of the tunnel is considerable during the pressure-relief process. So it should be pointed out that when the tunnel is close to the dewatering well, even there is a diaphragm wall cutting off the confined aquifer, the influence of dewatering on the horizontal deformation should be paid attention to. Besides, the long-term pressure-relief process will cause severe settlement of the tunnel; so it should be avoided when the confined aquifer is not completely cut off. ©, 2014, Academia Sinica. All right reserved.


Lin M.-B.,Tianjin University | Liu R.,Tianjin University | Xu Y.,Tianjin Architecture Design Institute | Li R.,Tianjin University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

The excavation results in unloading state of the soils, which influences the original loading characteristics of uplift piles. Based on the numerical simulation method, change of the bearing behaviors of the uplift piles caused by excavation is systematically studied. The rules of ultimate uplift capacity, side friction and axial force are discussed by comparing different excavation scopes and relative locations. The results show that, excavation leads to soil rebound under the bottom, induces positive side friction in the upper part of the piles and negative side friction in the under part, and reduces the ultimate uplift capacity of the piles. Moreover, the degree of decrease is proportional to the size of the foundation excavation. The variation of side friction and axial force of the center pile caused by foundation pit excavation is more obvious than that of side pile and corner pile and change of corner pile is the minimum. The ultimate uplift capacity of the center pile is largely affected by the curtain effect of group piles.


Liu R.,Tianjin University | Yan S.-W.,Tianjin University | Wang H.-B.,Tianjin University | Zhang J.,Tianjin University | Xu Y.,Tianjin Architecture Design Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Buckling of submarine pipelines may occur due to the action of axial soil frictional force caused by relative movement of soil and pipelines, which is induced by the thermal and internal pressure. The buckling may take place either laterally or vertically. The likelihood of occurrence of the buckling phenomenon is largely determined by the capability of the soil to resist pipeline movements. A series of large-scale model tests are carried out to facilitate the establishment of substantial data base for a variety of burial pipeline topologies. Fine sand is chosen as the supporting medium in view of Bohai Sea geotechnical conditions. Dry testing is employed for convenience. The pipes with diameters of 30 mm, 50 mm and 80 mm are used respectively. The pipes are buried in different depth-to-diameter ratios between 1 and 9. The uplift, lateral and axial resistances are recorded during the tests. Results show that the soil resistance depends on the pipe diameters and cover depth. For the same cover depth, the lateral soil resistance is more than twice as the uplift one. Based on the observed data, empirical formulas are established.


Huang Z.-W.,Tianjin Architecture Design Institute | Huang X.,Tianjin Architecture Design Institute | Hu X.-Y.,Tianjin Architecture Design Institute | Qi L.,Tianjin Architecture Design Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Foundation pit excavation above metro will influence the displacement of the existing metro tunnel. Based on soil-structure interaction model, a three-dimensional analysis model for metro tunnels is established, which is used to analyze the influence of foundation pit excavation on the displacement of the existing metro tunnel. The displacement of metro tunnels is controlled using technical measures, which include soil reinforcement and block excavation. The results indicate that the displacement of metro tunnels will be changed because of foundation pit excavation. The displacement of metro tunnels can be controlled using soil reinforcement and block excavation, and soil reinforcement effect is the most obvious.

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