The 9th General Team of Airport Construction of China

Chengdu, China

The 9th General Team of Airport Construction of China

Chengdu, China
SEARCH FILTERS
Time filter
Source Type

Gao W.,Wuhan University | Zhang L.-Y.,The 9th General Team of Airport Construction of China | Zhang F.-J.,Wuhan Construction Engineering Group Co.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

Critical slip surface searching is vital to slope stability analysis. Essentially, this is a path searching problem, which can be solved by the ant colony optimization method. To overcome the shortcomings of traditional ant colony optimization, the premium-penalty strategy is introduced, and the pheromone diversity of the good paths and the ordinary ones is increased to polarize pheromone density of all paths. Thus, a new algorithm namely Premium-Penalty Ant Colony Optimization is proposed to discrete and simulate the problem of the critical slip surface searching, by which the critical slip surface of slope can be located. Through two typical examples, one with simple slope and the other with complicated slope, and an application example of a slope project of a dam, the efficiency and effectiveness of the new algorithm are verified. The results show that, not only for simple slope but also for complicated slope, the new algorithm can always find the better critical slip surface in shorter time than many previous algorithms, and the new algorithm can be used in engineering practice very well.


Song F.,Chang'an University | Song F.,Key Laboratory of Highway Construction and Maintenance Technology in Loess Region | Li Y.-L.,Chang'an University | Zhang L.-Y.,The 9th General Team of Airport Construction of China | Zhang K.,Shenzhen Investigation and Research Institute Company Ltd
International Journal of Earth Sciences and Engineering | Year: 2014

As a new type of retaining structure, the geocell flexible retaining wall has a broad application prospect in the road slope protection. In this paper, based on the analysis of the results of centrifugal model tests and numerical simulation, the failure modes for geocell flexible retaining wall under different height-width ratios and soil strengths are investigated. On this basis, mathematical expression of failure modes of geocell flexible retaining wall with different height-width ratios and backfill strengths is formulated and corresponding sliding surfaces are also given. The results of this study can provide theoretical references for the design. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.


Song F.,Chang'an University | Song F.,Chongqing Jiaotong University | Li Y.-L.,Chang'an University | Zhang K.,Shenzhen Investigation and Research Institute Company Ltd | Zhang L.-Y.,The 9th General Team of Airport Construction of China
International Journal of Earth Sciences and Engineering | Year: 2014

Geocell reinforced retaining walls have been widely used in civil engineering for the protection of slopes. In order to decrease the horizontal deformation and increase the safety factor of the wall, the lengths of geocells in some layers are extended in the backfill to serve as reinforcement. However, the optimum sectional form of the geocell reinforced retaining wall hasn’t been fully studied. In this paper, by employing the geotechnical FEM software Plaxis, the effects of the location and the length of lengthening geocell layers on the mechanical properties of the wall are investigated. Research results indicate that the safety factor of the wall is the biggest when the location of the lengthening geocell layer is about 1/3 of the wall height from the bottom of the wall bottom. If the number of the lengthening geocell layers maintains the same, the safety factor of the wall with the lengthening geocell layers locating at the lower part of the wall is bigger than that of the wall with the geocell bar strips placed at the upper part. Besides, when the length of the lengthening geocell layer equals about the wall height, the safety factor of the wall is the biggest. © 2014 CAFET-INNOVA TECHNICAL SOCIETY.


Song F.,Chongqing Jiaotong University | Chen H.,Chang'an University | Xiao B.,Shenzhen Investigation and Research Institute Company Ltd | Zhang L.-Y.,The 9th General Team of Airport Construction of China
International Journal of Earth Sciences and Engineering | Year: 2014

As a new type of retaining structure, the geocell two-stage retaining wall, has a broad application prospect in the road slope protection. However, its optimum section form has not been systematically investigated. In this paper, the effects of height proportion and the length of the overlapping part of the two stages on the horizontal displacement of the wall back, the size of the sliding wedge and the safety factor are investigated by employing the geotechnical FEM software Plaxis. The research results indicate that, when the proportion of the height of the lower stage in the total height of the wall and the length of the overlapping part of the two stages are small, the horizontal displacement of the wall back is small, the size of the sliding wedge and the safety facor are both large. Based on the analysis of numerical simulation results, the optimum sectional form of the geocell two-stage retaining wall is discussed. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.


Song F.,Chang'an University | Xu W.-Q.,Huateng Ltd Liability Company of Road Test Examination in Sichuan | Zhang L.-Y.,The 9th General Team of Airport Construction of China | Peng Y.-G.,The General Construction Company of Xian
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The geocell flexible retaining wall is a new type of retaining structures for the slope protection; and it is widely used in highway engineering. The earth pressure against flexible retaining walls is closely related to the mode and amount of wall displacement. By employing the FEM software Plaxis, the deformation laws of geocell flexible retaining wall under different conditions are investigated. The effects of height-width ratio, slope ratio and surcharges on the deformation behavior of the flexible retaining wall is computed and analyzed. The study results show that when the height-width ratio is relatively large, the amount of horizontal displacement and flexural deformation of the wall is also large. And the shape of the wall back is an outer convex parabola. With the decrease of the height-width ratio, the amount of horizontal displacement and flexural deformation of the wall reduces and the shape of the wall back changes in turn. The amount of horizontal displacement of the top of the wall is large when the slope is steep but rapidly decreases when the slope becomes gentle. With the increase of the surcharge on the surface of the slope top, the amount of horizontal displacement of the wall top gradually decreases; while that of total wall displacements and flexural deformation gradually increases. The study results in can provide theoretical basis for the evaluation of the earth pressures against the geocell flexible retaining wall and thus have reference value for the design of such retaining walls.


Song F.,Chang'an University | Xie Y.-L.,Chang'an University | Yang X.-H.,Chang'an University | Zhang L.-Y.,The 9th General Team of Airport Construction of China
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

The geocell flexible retaining wall, a new type of retaining structures, has a broad application prospect in road slope protection. Flexural deformation of the flexible retaining wall will take place under the effect of earth pressures. Therefore, the failure mode of the geocell flexible retaining wall differs significantly from that of rigid retaining wall. And the backfill surface is always subjected to the surcharge. The failure process and failure mode of the geocell flexible retaining wall with surcharge acting on the backfill surface are studied by means of the centrifugal model tests. Moreover, its failure mode is compared with that of the one without the effect of surcharge. The results indicate that the surcharge acting on the backfill surface has little effect on the failure mode of the geocell flexible retaining wall, and thus the same failure mode with the one whose backfill surface is not acted by the surcharge can be employed in the calculation of earth pressures against the flexible retaining wall.

Loading The 9th General Team of Airport Construction of China collaborators
Loading The 9th General Team of Airport Construction of China collaborators