scholarly journals Evaluating the Behavior of Embankments after Widening considering Soil Consolidation and Splicing Mode

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Xiaobo Xing ◽  
Zhenhao Bao ◽  
Wei Li
Keyword(s):  
Mechanical Response ◽  
Coupling Model ◽  
Differential Settlement ◽  
Soil Consolidation ◽  
Construction Process ◽  
Height Difference ◽  
Reconstruction Project ◽  
Embankment Height ◽  
Road Widening ◽  
Consolidation Time

Increased traffic volume has made it necessary to increase highway capacities by widening embankments and pavements. Differential settlement of foundation consolidation and rational utilization of existing embankments are the main problems encountered in road reconstruction. In this paper, the finite difference method is used to simulate the construction process of using the existing embankments directly in the reconstruction project of expressway, and the fluid-solid coupling model of foundation settlement is established to calculate the differential settlement between foundation and subgrade. The influence of road widening mode and embankment height on differential settlement is analyzed. The mechanical response of subgrade under differential settlement is simulated and the law of uneven settlement of main reconstruction forms is investigated. The dynamic response of existing embankments soil under the action of rammer is systematically evaluated. The results show that, with the increase of consolidation time, the differential settlement is gradually obvious at the junction of the new and existing embankments, and there is a possibility of landslide along the junction of new embankments, which should be dealt with in engineering. The smaller the height difference between the existing foundation and the new foundation is, the more the position of the maximum settlement point of the foundation moves towards the new foundation. The greater the height of the new subgrade is, the greater the uneven settlement is. The criterion based on the single rammed energy and compaction stopping standard is proposed to determine the reinforcement depth of existing embankment.

Old and New Embankment Splicing Technology in Highway Reconstruction Project

2014 ◽  
Vol 587-589 ◽  
pp. 1190-1193 ◽  
Author(s):  
Gao Zhan
Keyword(s):  
Differential Settlement ◽  
Processing Technology ◽  
Good Effect ◽  
Construction Technology ◽  
Construction Process ◽  
Treatment Technology ◽  
High Quality ◽  
Rational Use ◽  
Cutting Slope ◽  
Reconstruction Project

In order to make a better convergence of old and new roadbed,according to treatment technology about highway reconstruction project of new and old roadbed lap,we introduced the four good construction technology detailedly used in the construction process. Four kinds of processing technology can significantly reduce differential settlement caused by road diseases,and strengthen the widening subgrade integrity.The results show that the appropriate cutting slope and excavation steps, a good degree of compaction, the rational use of geosynthetic materials, the use of the use of high quality packing can make the new and old roadbed integrity, achieve good effect of design and construction and reduced the incidence of disease.

scholarly journals Soil shrinkage and consolidation study on flood embankments in swamp irrigation areas

2021 ◽  
pp. 101-110 ◽  
Author(s):  
Lusmeilia Afriani ◽  
Gatot Eko Susilo ◽  
Sri Nawangrini ◽  
Iswan Iswan
Keyword(s):  
Laboratory Tests ◽  
Linear Shrinkage ◽  
Soil Samples ◽  
Field Observations ◽  
Soil Consolidation ◽  
North East ◽  
Soil Shrinkage ◽  
Embankment Height ◽  
The One ◽  
Downstream Area

Research in this paper discusses shrinking and consolidation of flood embankments soil in swamp irrigation areas. The flood embankments are made from swampy soil materials. The focus of this research is the reduction of dyke embankment height that occurs due to soil shrinkage and soil consolidation. Investigations about the time of consolidation and land subsidence that occurred on the embankment at certain periods after the embankment established were also carried out in this study. The research sites are some swamp irrigation areas in the Tulang Bawang Watershed, around North-East Lampung, Indonesia. This research was carried out by conducting laboratory tests on soil samples and field observations on the reduction in height of flood embankments in the study area. The research shows that the main cause of total decrease on the embankment is due to linear shrinkage, consolidation of soil under the embankment, an immediate subsidence, and the subsidence of the embankment themselves. Their contribution to total decrease of embankment is 42.51%, 34.48%, 18.32%, and 4.62%, respectively. Results also indicate that the ratio between the percentage of embankment consolidation in downstream area happen faster than the one in upstream area of the river.

scholarly journals Research on Mechanical Response of Pavement Structure to Differential Settlement of Subgrade on Highway Widening

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Quanjun Shen ◽  
Yu Lu ◽  
Yaohui Yang ◽  
Guanxu Long
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Mechanical Response ◽  
Element Model ◽  
Differential Settlement ◽  
Failure Strength ◽  
Pavement Surface ◽  
Practical Engineering ◽  
Pavement Structure ◽  
The Finite Element Model

Based on the widening project of Ri-Lan highway in China, the finite element model is established by PLAXIS. By applying differential settlement at the bottom of the pavement, the mechanical response of the pavement structure is analysed. Finally, the differential settlement control standard indicated by crack strength is proposed. The results show that, under the effect of differential settlement, within about 4 cm of old pavement surface and upper base bear tensile stress, the base first reaches the failure strength. Under 4 cm of the old pavement surface, the subbase first reaches the failure strength. The differential settlement control standard of the pavement structure is determined by the splitting strength of the material, and we, respectively, control the differential settlement of less than 23.4 mm, where the corresponding cross-slope rate is 0.33%, and below 75.2 mm, where the corresponding cross-slope rate is 0.54%. It could support practical engineering applications.

Rigid–flexible coupled dynamic response of steel–concrete bridges on expressways considering vehicle–road–bridge interaction

2019 ◽  
Vol 23 (1) ◽  
pp. 160-173
Author(s):  
Enli Chen ◽  
Xia Zhang ◽  
Gaolei Wang
Keyword(s):  
Dynamic Response ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Interaction Model ◽  
Coupling Model ◽  
Concrete Bridges ◽  
Dynamic Coupling ◽  
Vehicle Model ◽  
Flexible Coupling ◽  
Bridge Model

Steel–concrete bridges on highways are now widely used, and their dynamic coupling effect is more prominent under heavy vehicles. At present, for the study of vehicle–bridge coupling, it is difficult to reflect the mechanical response characteristics of the bridge pavement because the bridge pavement (road) is often considered as a load. In order to get closer to reality, we use the whole vehicle model and the bridge model to realize the dynamic coupling of highway vehicle–bridge. Moreover, the vehicle model can take into account tire characteristics, such as various linear and nonlinear suspension characteristics, and tire–ground contact characteristics. So, a new vehicle–road–bridge interaction method with higher computational efficiency is proposed. This method can be used not only to analyze the overall mechanical response of bridge structure such as deflection and stress but also to analyze the dynamic characteristics of driving vehicles and the coupling force between tires and pavement and then to analyze the dynamic deformation and stress of asphalt pavement layers on the bridge. First, according to the construction drawings of a steel–concrete bridge on a highway and a Dongfeng brand three-axle vehicle, a vehicle–road–bridge interaction rigid–flexible coupling model was established. Second, the correctness and effectiveness of the vehicle–road–bridge interaction model were verified by field testing. Finally, the dynamic response of the vehicle–road–bridge interaction rigid–flexible coupling model was analyzed.

Cutting Stability Analysis under the Influence of Blasting

2012 ◽  
Vol 170-173 ◽  
pp. 3035-3040
Author(s):  
Peng Fei Xiao ◽  
Wen Xue Gao ◽  
Bing Hui Hou ◽  
Ning Ning Chen
Keyword(s):  
Time History ◽  
Slope Instability ◽  
Construction Process ◽  
Protective Measures ◽  
Field Displacement ◽  
History Analysis ◽  
Blasting Excavation ◽  
Reconstruction Project ◽  
Vibration Wave ◽  
The Stability

The blasting effect is an important factor to influence the stability of the slope blasting construction, understanding the reasons of the slope instability under blasting construction, taking reasonable effective protective measures, which can greatly reduce slope instability phenomena during the construction. Combining with the 111 national highway (Tanghekou ~Beijing boundary) reconstruction project, through numerical simulation, using strength reduction fem for time history analysis, discuss under blast loads slope's the stress field, displacement field and the spread rule of vibration wave, systematically analysis blasting excavation impact on slope stability summarizing in construction process the question should be pay attention ,which can be a guidance for relevant similar engineering design and construction.

Characteristics of EPS Materials and the Application in Road and Bridge Projects

2014 ◽  
Vol 501-504 ◽  
pp. 1418-1423 ◽  
Author(s):  
Yun Hua Luo ◽  
Hai Ying Hu ◽  
Zhi Xing Huang ◽  
Yu Cheng Zhang
Keyword(s):  
Corrosion Resistance ◽  
Correlation Analysis ◽  
Water Resistance ◽  
Expanded Polystyrene ◽  
Differential Settlement ◽  
Bridge Engineering ◽  
Light Water ◽  
The Road ◽  
Soft Foundation ◽  
Road Widening

EPS (Expanded Polystyrene) materials have the features of super light, water resistance, anti-ageing, corrosion resistance and well supporting itself .They are now widely used in civil engineering because of their unique features for its unique characteristics. This paper introduces the properties of EPS and the application of EPS in the road and bridge engineering. The correlation analysis showed that The pressure on the foundation can be greatly reduced by the EPS filling embankment in soft foundation, and the settlement and displacement of the EPS embankment are small and its stability is good. The application of EPS in the embankment of a bridge can solve the bumping problems due to differential settlements of road and bridge. EPSs application can reduce differential settlement in the embankment splicing and strengthen intensity in the embankment splicing, which making the new and old expressway as a union in the road-widening project.

scholarly journals Dynamic Analysis of Metro Train-Monolithic Bed Track System under Tunnel Differential Settlement

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Jiqing Jiang ◽  
Beibei Dong ◽  
Zhi Ding ◽  
Gang Wei ◽  
He Zhang ◽  
...  
Keyword(s):  
Southern China ◽  
Soft Soil ◽  
Coupling Model ◽  
Differential Settlement ◽  
Track System ◽  
Metro Tunnel ◽  
The Time Domain ◽  
Dynamic Coupling Model ◽  
Train Safety ◽  
Vibration Performance

The metro tunnel lines built in a soft soil area may suffer from tunnel differential settlement due to the high compressibility of soft soil, the engineering constructions nearby tunnel lines, and the cyclic load of metro trains. In this paper, a dynamic coupling model for a metro train-monolithic bed track system under tunnel differential settlement is established. A cosine function is introduced to simulate a real settlement curve measured from a metro tunnel in southern China, and the vibration performance of the train-track system under tunnel settlements is investigated in both the time domain and frequency domain. Based on the standards for the train safety and passengers’ comfort, the speed limit for the metro train traveling on a monolithic bed track with different settlement distributions are concluded. The present research could be useful for the operation and maintenance of metro tunnels in soft soil areas.

Management Research on Treatment Measures for Differential Settlement of Tianjin-Binhai Expressway's Widened Subgrade

2014 ◽  
Vol 505-506 ◽  
pp. 28-34
Author(s):  
Yu Guo Wei ◽  
Wei Feng Zhou ◽  
Yuan Yuan Li
Keyword(s):  
Quality Control ◽  
Mechanical Response ◽  
Differential Settlement ◽  
Design Parameters ◽  
Management Research ◽  
Analysis Model ◽  
Treatment Measures ◽  
Pavement Structure ◽  
Final Settlement

Control of differential settlement of widened subgrade is one of key pints for the quality control of expressway reconstruction and extension projects and a focus for many scholars. In the paper, the analysis model of the pavement structure stress is built based on character and design parameters of the subgrade and pavement of Tianjin-Binhai Expressway. The control standards for the subgrade and pavements differential settlement of Tianjin-Binhai Expressway are confirmed through analyzing the pavements mechanical response under different differential settlements and treatment measures are taken according to classification of different differential settlements to control the final settlement amount within the preset range, which provides references for renovation and extension projects in future.

scholarly journals 4D modeling of concentrating mill tailings dam protecting dike soil consolidation

2020 ◽  
Vol 7 (7) ◽  
pp. 55-62
Author(s):  
Nadezhda A. Kalashnik ◽  
Keyword(s):  
Alluvial Soils ◽  
Tailings Dam ◽  
Soil Consolidation ◽  
Engineering Construction ◽  
Mining Enterprise ◽  
Mill Tailings ◽  
Water Saturated ◽  
Technical Basis ◽  
Fi Ltration ◽  
Consolidation Time

Introduction. The research aims to study concentrating mill tailings dam protecting dike soil consolidation on the example of a mining enterprise of the Kola Peninsula. Research methodology. The research is based on 4D modeling (taking into account a time factor) using PLAXIS software solution. The computer hydro-geomechanical 3D model of the concentrating mill tailings dam fragment has been developed allowing to investigate both geomechanical and fi ltration processes, and their collateral infl uence on protecting dike and alluvial beach soil consolidation. The following options of tailings dam hydro-geomechanical condition development are considered: a reference state at the current parameters of operation, increase in the level of water-saturated tail deposits and the subsequent consolidation of bulk and alluvial soils within 1, 2, 3, 5, 10, 15, 20, 30, 50 and 80 days. Research results and analysis. The received results have been analyzed on the dynamics of the tailings dam hydro-geomechanical condition therefore revealing its behavior in time. It has been established that the nature of bulk and alluvial soils consolidation is identical, however, differs signifi cantly in terms of quantity. Conclusions. Dependences of bulk and alluvial soils consolidation of the tailings dam hydraulic engineering construction on consolidation time are established providing a scientifi c and technical basis for its mechanical state and stability assessment, and for engineering recommendations about the terms of the following stage of dams building.

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