scholarly journals Ecological Retaining Wall for High-Steep Slopes: A Case Study in the Ji-Lai Expressway, Eastern China

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Peng Jiang ◽  
Jin Li ◽  
Shen Zuo ◽  
Xin Zhuang Cui
Keyword(s):  
Field Experiments ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Eastern China ◽  
Earth Pressure ◽  
Horizontal Displacement ◽  
Steep Slope ◽  
Protection Scheme ◽  
Steep Slopes

Research on the retaining structures for high-steep slopes is extremely significant because of its real-world applications and far-reaching implications. A flexible geocell-reinforced ecological retaining wall as a high-steep slope protection scheme was developed and applied to the slope protection project of the Ji-Lai Expressway by analyzing the reinforcement mechanism of the geocell used. The lateral displacement and Earth pressure distribution on the flexible ecological retaining wall applied to the high-steep slope were studied using finite element numerical simulations and verified using field experiments. Results reveal that the wall maximum horizontal displacement is 2/3 H away from the wall toe because of the replacement of the upper part of soil. There is an obvious bucking effect on the active Earth pressure around the stiffened site, and the flexible deformation of the retaining wall helped effectively release some of the Earth pressure. Consequently, the measured value is lower than the theoretical value. Through this case study, it is demonstrated that the flexible ecological retaining wall as a slope protection technology can be successfully applied to steep slopes with a height of more than 15 m. Moreover, it brings significant advantages for protecting the ecological environment and improving the highway landscape.

INVESTIGATING THE INTERACTION BETWEEN STABILIZED EXCAVATION BY NAILING AND ADJACENT URBAN TUNNELS: CASE STUDY

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Somaye Hosseini ◽  
Mahmood Parsaei
Keyword(s):  
Large Scale ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Analysis Tool ◽  
Horizontal Distance ◽  
Subway Tunnel

Urban development could be evaluated by considering the transportation and construction industries. The transportation industry development causes an increase in the urban subway lines as well as underground tunnels. Concerning the construction industry, the large-scale buildings development such as commercial malls, high-rise buildings, and underground parking structures may require deep excavations at metropolitan projects. In this paper, a parametric study is carried out by considering the distance of a tunnel from a retaining wall with the staged construction. PLAXIS 2.0D ver.8.5 software is used as an analysis tool. The results show that existing tunnels are affected more than retaining walls during an excavation when the structural response is considered. By increasing the horizontal distance of tunnel center from the wall, lateral displacement and the bending moment of the tunnel would decrease 14% and the vertical displacement and bending moment of tunnel’s Crown would reduce by 15% and 12%, respectively. These interaction effects become negligible after a distance of 5 times the tunnel diameter. Besides, the existence of the tunnel in the vicinity of excavations would increase the top horizontal displacement of the retaining wall by about 13%. It is worthwhile to point out that the current paper is based on a case study on Sharif University multistory underground parking located near the subway tunnel in Tehran city stabilized by deploying a nailing and anchorage system.

Study on the applicability of a retaining wall using batter piles in clay

2016 ◽  
Vol 53 (8) ◽  
pp. 1195-1212 ◽  
Author(s):  
Minsu Seo ◽  
Jong-Chul Im ◽  
Changyoung Kim ◽  
Jae-Won Yoo
Keyword(s):  
Lateral Displacement ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Integrated System ◽  
Element Analysis ◽  
Test Execution ◽  
The Earth ◽  
National University ◽  
Clay Ground ◽  
Batter Piles

A retaining wall using batter piles has been developed and studied to improve existing earth-retaining structures at Pusan National University. The earth-retaining method is a temporary excavation method using an integrated system of front supports and batter piles. The batter piles connected to the front supports significantly reduce the earth pressure acting on the front supports by distributing it to batter piles to increase structural stability. In this study, the existence of batter piles, the fixity of the tips of front supports or batter piles, the spacing between batter piles, and the verticality of front supports are varied across model tests. The lateral displacement of the earth-retaining wall decreased by approximately 40% and 15% for the existence and fixity of batter piles, respectively. The applicability of the earth-retaining method using batter piles has been verified with finite element analysis and field test execution in clay ground.

OCENSA Oil Pipeline Damage due to the Construction of an Embankment for a Highway on Soft Soils: Case Study

2017 ◽  
Author(s):  
Julian Corrales ◽  
Hugo Alberto García García ◽  
Alejandro Marín ◽  
Mauricio Pereira Ordóñez
Keyword(s):  
Lateral Displacement ◽  
Load Capacity ◽  
Horizontal Displacement ◽  
Oil Pipeline ◽  
The Road ◽  
River Flood ◽  
Adjacent Soil ◽  
The Caribbean ◽  
Magdalena River

The OCENSA pipeline crosses the Valley of the Magdalena river flood on its way to the Caribbean Sea, the area of the valley is commonly inundated during the rainy season on shallow waters that remain flooded swamps. These swamps soils are composed by extremely soft peat with thicknesses greater than 15 meters. In June 2016 started the construction of a highway with an embankment of 6 meters in height which was more than 30 meters away from the OCENSA 30” pipeline, Due to the high compressibility of peat, to construct the road the soil is subjected to a process of consolidation and the height of the embankment was corrected adding more material. In July 29 2016 occurs a failure by load capacity on the ground under the embankment and as a result of this fault a lateral displacement of the adjacent soil producing a horizontal displacement in the pipeline of more than 50 cm. This document shows results from the affectation to the pipe and the measures taken to correct the situation.

scholarly journals Multi-Criteria Parametric Verifications for Stability Diagnosis of Rammed-Earth Historic Urban Ramparts Working as Retaining Walls

2021 ◽  
Vol 11 (6) ◽  
pp. 2744
Author(s):  
Álvaro R. Serrano-Chacón ◽  
Emilio J. Mascort-Albea ◽  
Jacinto Canivell ◽  
Rocío Romero-Hernández ◽  
Antonio Jaramillo-Morilla
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Retaining Walls ◽  
International Committee ◽  
Lateral Earth Pressure ◽  
Research Sector ◽  
Overall Stability ◽  
Urban Contexts ◽  
And Control

Institutions such as ICOFORT (International committee on fortifications and military heritage) encourages the development of diagnosis strategies for the conservation and maintenance of historic earthen walls as highly necessary. Thus, it is important to be aware of the conditions in urban contexts, where the deterioration can be more aggressive and the risk of damage increases. Despite this, there are many strategies of constructive diagnosis for these kinds of monuments, but not many of them are concerned with the structural assessment of situations in which the ramparts work as a retaining wall in an unforeseen way. The medieval ramparts of Seville (Spain) are shown as a completely representative case study of the above-mentioned situation. In the research sector, the monument resists the lateral earth pressure developed by the new difference in height at both sides of the wall. Based on the limited states principle and on different international codes formulation, a tool was programmed to carry out automatic calculations to verify the case study’s overall stability conditions using standard sections. The obtained results were based on the overturning, bearing, and sliding overdesign factors (ODF) and determined a stable situation that could be at risk because of changes in the surrounding such as, excavations or the movements of the ground water table, or seismic events. Thus, the need and usefulness of strategies and control instruments that should be integrated into heritage intervention projects have been proved.

scholarly journals Stability analysis of composite I-shaped masonry reinforced retaining wall

2020 ◽  
Vol 198 ◽  
pp. 02032
Author(s):  
Wu Yuedong ◽  
Zhang Lei ◽  
Xu Nan ◽  
Lui Jian
Keyword(s):  
Numerical Simulation ◽  
Retaining Wall ◽  
Single Layer ◽  
Earth Pressure ◽  
Horizontal Displacement ◽  
Finite Element Software ◽  
The Earth ◽  
Overall Stability ◽  
The Stability ◽  
Reinforced Retaining Wall

Based on the actual project, the influence of geogrid on the stability of the retaining wall of the single-layer masonry reinforced retaining wall is studied through field test and finite element software ABAQUS numerical simulation. The influence of geogrid on the stability of the retaining wall was determined by analyzing the changes in the pressure of the backfill, the displacement of the retaining wall and the strain of the geogrid, and changing the length and spacing of the geogrid through the controlled variable method. The results show that the geogrid can limit the horizontal displacement of the soil, balance the earth pressure, and improve the overall stability of the retaining wall. By increasing the length of the geogrid and reducing the distance of the geogrid, the design of the retaining wall is optimized, which has good economic and time benefits.

Performance of a Combined Retaining Wall Structure Supporting a High Embankment on a Steep Slope: Case Study

2020 ◽  
Vol 20 (6) ◽  
pp. 05020002
Author(s):  
Mingxing Xie ◽  
Junjie Zheng ◽  
Rongjun Zhang ◽  
Lan Cui ◽  
Chenxi Miao
Keyword(s):  
Retaining Wall ◽  
Steep Slope ◽  
Wall Structure

Double Twisted Hexagonal Wire Mesh Retaining Wall Seismic Numerical Analysis

2011 ◽  
Vol 243-249 ◽  
pp. 3899-3906
Author(s):  
Yun Li ◽  
Zhao Hui Qin
Keyword(s):  
Numerical Analysis ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Horizontal Displacement ◽  
Wire Mesh ◽  
Lateral Earth Pressure ◽  
Strength And Deformation

Based on constitutive model of soil and reinforcement-soil, a numerical analysis program is compiled by finite difference method. Strength and deformation characteristics of double twisted hexagonal wire mesh retaining wall under seismic loading are analyzed by 3D finite difference method. The behaviors such as horizontal displacement, settlement of retaining wall, earth pressure of basement and distribution of lateral earth pressure along wall-back are obtained.

Seismic sedimentology of sand-gravel bodies on the steep slope of rift basins — A case study of the Shahejie Formation, Dongying Sag, Eastern China

2018 ◽  
Vol 6 (2) ◽  
pp. SD13-SD27 ◽  
Author(s):  
Xiaomin Zhu ◽  
Rong Pan ◽  
Shunli Li ◽  
Hongbao Wang ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Eastern China ◽  
Steep Slope ◽  
Coarse Grained ◽  
Rift Basins ◽  
Dongying Sag ◽  
Near Shore ◽  
Shahejie Formation ◽  
Depositional Systems ◽  
Seismic Sedimentology ◽  
Steep Slopes

A variety of genetic types of reservoirs with good hydrocarbon accumulation conditions have been developed in petroliferous rift basins. The near-provenance, coarse-grained depositional system on the steep slopes of rift basins has become an important oil and gas exploration area. However, due to the large changes in lithologies and difficulties in its identification and characterization, the challenges in oil/gas exploration are significant. Seismic sedimentology, in this case, provides an effective means of identifying and characterizing the complex, coarse-grained sediments. We use a large number of cores, logs, and seismic data and establish the third- and fourth-order sequence frameworks in the Shahejie Formation on the steep slope of the northern Dongying Sag in eastern China. Three types of lithofacies, including conglomerates, sandstones, and mudstones with 12 subspecies facies types have been identified and the relationship between different lithofacies types and depositional systems is determined. The relative changes of the lake level control the distribution of depositional systems in a sequence framework. Lowstand system tracts of SQ3 and SQ4 in the Shahejie Formation mainly developed near-shore subaqueous fans and a small number of slump turbidite fans. Small-scale offshore fans mainly develop in lacustrine transgressive systems tracts, and fan deltas, flood-type sublake fans, slump turbidite fans, and near-shore subaqueous fans mainly developed in highstand systems tracts. The study of seismic sedimentology, based on the theory of seismic lithology and seismic geomorphology, have been carried out. Stratal slices are used to identify and characterize the morphology and temporal-spatial distributions of various types of sand-gravel bodies on the steep slopes of the Dongying Sag based on core calibration and establish the model of seismic sedimentology for various types of sand-gravel bodies in different systems tracts.

Model Test of Mechanical Characteristics of Cantilever Retaining Wall with Mutual Anchor

2011 ◽  
Vol 90-93 ◽  
pp. 508-513
Author(s):  
Hong Bo Zhang ◽  
Xiu Guang Song ◽  
Jian Hong Jiang ◽  
Ya Nan Zang ◽  
Zhi Gang Dou
Keyword(s):  
Model Test ◽  
Mechanical Characteristics ◽  
Lateral Displacement ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Lateral Earth Pressure ◽  
Force Characteristics

In order to analysis force characteristics and changes of the anchor tension during the process of filling soil of the pull cantilever retaining wall, a model test is designed for research. The test mainly monitors basal earth pressure, lateral earth pressure of the retaining wall, anchor shaft force, lateral displacement of the retaining wall.

scholarly journals Early Identification for Prospective Housing Area in the Landslide Potential Zone

2019 ◽  
Author(s):  
Helmi Setia Ritma Pamungkas ◽  
Solihin . ◽  
Laila Mardlotillah Yogaswara
Keyword(s):  
Early Identification ◽  
Survey Methods ◽  
Retaining Wall ◽  
Steep Slope ◽  
Soil Survey ◽  
Shallow Foundation ◽  
Survey Method ◽  
Landslide Risk ◽  
Potential Zone ◽  
Steep Slopes

Identification of area for prospective housing before construction is much needed, especially area with a steep slope and young volcanic that have landslide risk. The risk of landslides is not only caused by high rainfall or steep slope but can be caused by shocks due to earthquakes. It is necessary to identify the rock types in the prospective housing near Mount Salak in Cijeruk area, Bogor Regency. The purpose of this research is early identification types of rocks, soils, and potential of a landslide in prospective housing by geological and soil survey methods. The geological survey method used is to identify morphometry and lithology specially landslide, whereas soil survey identifies soil characteristics. According to results of research, morphometry at prospective housing is included moderately until steep slope category. Steep slopes potentially cause landslides with debris avalanche type. Characteristics of soil at Cijeruk support it has an of high coefficient of linear extensibility; this condition affects the shallow foundation movement. Therefore needs additional material so that the coefficient of linear extensibility value becomes low. The soil in this location comes from volcanic activity with tuff and lapilli types, sometimes found pebbles until boulder, and they are not lithification. If the location of the housing is exposed to an earthquake with a scale of 5 SR, it would be high shocks and areas with steep slopes would cause landslides. For maintenance from landslides, retaining walls need to be made with the type of gravity wall and cantilever wall. The distance between the retaining wall and housing is 15 meters. The type of foundation to be used is the foundation of the spread footing.

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