scholarly journals Application of Polymer Curing Agent in Ecological Protection Engineering of Weak Rock Slopes

2019 ◽  
Vol 9 (8) ◽  
pp. 1585 ◽  
Author(s):  
Ding Yao ◽  
Guoping Qian ◽  
Jiawu Liu ◽  
Jialiang Yao
Keyword(s):  
Slope Instability ◽  
Weak Rock ◽  
Curing Agent ◽  
Rock Slopes ◽  
Acrylic Emulsion ◽  
Finite Element Software ◽  
Stability Of Slopes ◽  
Ecological Protection ◽  
Polymer Curing ◽  
The Stability

Under the action of water, weak rock slopes easily expand and the strength and stiffness decrease, which results in slope instability. The styrene–acrylic emulsion cement-matrix composite, a new type of polymer curing agent, was developed for the curing and treatment of weak rock slopes. The strength-reduction factor method and ANSYS finite element software were used to calculate and analyze the stability of slopes before and after protection. The stability safety factor of weak rock after protection increased by 30% from 2.0 to 2.6. In order to evaluate the performance of the polymer curing agent, the mixture test was carried out in the laboratory. It was found that the waterproofness, hydrophobicity, and microstructure of weak rock slopes with the polymer curing agent can be significantly improved. Finally, the polymer curing agent was adopted and the external-soil spray-seeding technique was used in physical engineering. From test results, it was indicated that the polymer curing agent for weak slopes is beneficial in improving the water-damage resistance of a slope surface and prevent or reduce the softening of weak rock so that plants can grow for a long time. The treatment for weak rock slopes was successfully combined with plant protection, achieving the dual effect of weak rock slope protection and ecological protection.

scholarly journals Research on the Ecological Protection of Coal Gangue Slope Based on a Polymer Curing Agent

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jian Zhang ◽  
Wen Yi ◽  
Weijia Yuan ◽  
Yifang Liu ◽  
Zifan Sui
Keyword(s):  
Network Structure ◽  
Raw Materials ◽  
Coal Gangue ◽  
Curing Agent ◽  
Acrylic Emulsion ◽  
Protection Mechanism ◽  
Growth Environment ◽  
Ecological Protection ◽  
Polymer Curing ◽  
Film Layer

To improve the ecological protection of coal gangue slopes, this work developed a polymer curing agent using a pure acrylic emulsion and cement as the main raw materials. By testing the workability, waterproofing, durability, and adhesion of the curing agent with different polymer-to-cement ratios, the optimum mixing ratio of the polymer curing agent was obtained, and the protection mechanism was analysed based on the test results and by scanning electron microscopy (SEM). Then, simulated slope and practical engineering applications were carried out. The results show that pure acrylic emulsion curing agent with a polymer-to-cement ratio of 6 : 5 is most suitable for the ecological protection of coal gangue slopes. The polymer curing agent can form a network structure film layer with a good waterproofing effect on the coal gangue surface. Simultaneously, the network structure film layer can reduce the influence of weathering and leaching on the coal gangue, prevent the heavy metal elements in coal gangue from entering the surrounding soil, improve the growth environment of plants, and improve the effect of ecological restoration. This research can be applied to the ecological protection of coal gangue slopes.

scholarly journals Assessment of Slope Instability and Risk Analysis of Road Cut Slopes in Lashotor Pass, Iran

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Mohammad Hossein Taherynia ◽  
Mojtaba Mohammadi ◽  
Rasoul Ajalloeian
Keyword(s):  
Rock Mass ◽  
Risk Analysis ◽  
Rock Slope ◽  
Classification Systems ◽  
Slope Instability ◽  
Rock Slope Stability ◽  
Rock Slopes ◽  
The Stability ◽  
Cut Slopes ◽  
Road Cut Slopes

Assessment of the stability of natural and artificial rock slopes is an important topic in the rock mechanics sciences. One of the most widely used methods for this purpose is the classification of the slope rock mass. In the recent decades, several rock slope classification systems are presented by many researchers. Each one of these rock mass classification systems uses different parameters and rating systems. These differences are due to the diversity of affecting parameters and the degree of influence on the rock slope stability. Another important point in rock slope stability is appraisal hazard and risk analysis. In the risk analysis, the degree of danger of rock slope instability is determined. The Lashotor pass is located in the Shiraz-Isfahan highway in Iran. Field surveys indicate that there are high potentialities of instability in the road cut slopes of the Lashotor pass. In the current paper, the stability of the rock slopes in the Lashotor pass is studied comprehensively with different classification methods. For risk analyses, we estimated dangerous area by use of the RocFall software. Furthermore, the dangers of falling rocks for the vehicles passing the Lashotor pass are estimated according to rockfall hazard rating system.

Geotechnical aspects of pipeline construction in Alberta

1983 ◽  
Vol 20 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Robert G. Marshall ◽  
Tony F. Ruban
Keyword(s):  
Slope Instability ◽  
Subsurface Water ◽  
Remedial Measures ◽  
Right Of Way ◽  
Stability Of Slopes ◽  
Severe Erosion ◽  
The Stability ◽  
The Right ◽  
Geotechnical Problems ◽  
Design Construction

Geotechnical engineering is playing an ever-increasing role in the design and construction of pipelines within the Province of Alberta and elsewhere in Canada. There is a growing geotechnical awareness developing within the pipeline industry that has been spurred, to some extent, by the high costs of geotechnical remedial measures and increased environmental concerns.This paper presents major geotechnical problems that the pipeline industry faces in the design, construction, and operation of pipelines within Alberta. Geotechnical considerations involved in the location of pipelines and specific methods incorporated in the design to ensure the stability of slopes and prevent erosion are presented. Recent improvements of existing methods used in the control of surface and subsurface water within the right-of-way are outlined.There have been cases where an operating pipeline has developed geotechnical problems, such as slope instability or severe erosion, that necessitate some form of remedial action. Methods used to monitor potentially unstable right-of-way slopes and the specific remedial measures implemented are presented.

The effect of Quaternary uplift on the stability of slopes in the central part the Skorusinske Vrchy mountains in the west Carpathians

1991 ◽  
Vol 7 (1) ◽  
pp. 659-664 ◽  
Author(s):  
M. Kovacik ◽  
R. Ondrasic
Keyword(s):  
Mass Movement ◽  
Slope Instability ◽  
Aerial Photographs ◽  
The West ◽  
Stability Of Slopes ◽  
Uplifted Block ◽  
West Carpathians ◽  
The Difference ◽  
The Stability ◽  
Geomorphological Evolution

AbstractThe Skorušinské vrchy mountains are part of the West Carpathians in northwest Slovakia near the Polish border. They consist of four Palaeogene sedimentary complexes and comprise a 1500 to 2000 m thick sequence of conglomerates, claystones, flyschoid rocks and sandstones. The older complexes erop out on the margins of the mountains and are covered by relatively thin clayey soils. The central part, the most highly uplifted block, consists of Eocene calcareous sandstone which are disturbed by joints and deep-seated faults. The difference in elevation between the mountain summits and the valley floors is more than 400 m.A detailed investigation of mass movement has been carried out using aerial photographs,air borne radar and satellite imagery foliowed by a field survey.Three main types of slope deformation were identified - rock block slides along bedding surfaces, rock siumps across bedding surfaces and landslides in slope debris. The occurrence of the largest and most deep-seated slides are controlled by faults. The presence of these mass deformations indicate the existence of tilted fault blocks which are the result of neotectonic arch uplift. About 15–17% of the area covered by sandstones is affected by mass movements. This paper describes the methodology of the investigation, the mechanism and genesis of slope deformations, the occurrence and parameters of slides and the role of the Quaternary uplift in the slope instability component of regional geomorphological evolution.

Influences of Joint Persistence and Groundwater on Wedge Failure Potential of Jointed Rock Slope

2020 ◽  
Author(s):  
Yu-Hsuan Chang ◽  
Cheng-Han Lin ◽  
Ming-Lang Lin
Keyword(s):  
Rock Slope ◽  
Water Pressure ◽  
Jointed Rock ◽  
Slope Instability ◽  
Rock Slope Stability ◽  
Rock Slopes ◽  
Wedge Failure ◽  
Large Landslide ◽  
Potential Failure ◽  
The Stability

<p>Joint persistence and groundwater are critical factors that influence the stability of rock slope. Persistence dominates the extent of pre-existing potential failure surfaces. Under certain conditions, slope instability may vary with time, as the propagation of existing joints leads to the development of fully persistence failure surfaces. At the same time, groundwater may travel through the fracture network and provides an external force to unstable rock masses, resulting in the damage of rock slope failure hard to predict. In general, when a rock slope consists of two or more sets of joints, the wedge failure often becomes the initial structurally controlled failure of a progressive large landslide. A classic case, which was occurred at a steep cut rock slope on 32.5k, Provincial Highway 7, Taiwan, had been completely recorded with UAV-surveys, field investigations and witness. The landslide first occurred on 13th May 2019 as a wedge failure with the magnitude of the volume of 892 m<sup>3</sup> and resulted in a large landslide on 29th July 2019 with the magnitude of the volume of 37234 m<sup>3</sup>, destroyed the protection measures and roads. According to the field investigation, groundwater was discovered flowing out from the line of intersection of persistence joints, which could be the main reason leads to the wedge failure and the progressive large rockslide. Hence, the couple mechanics-hydraulic behavior in a rock slope should be studied in more detail to mitigate such hazards.</p><p>In this study, sandbox model was applied to clarify the effects of the groundwater and joint friction on failures of single rock wedge. In addition, the software 3DEC, which is based on Distinct Element method, was carried out to extent the analysis conditions. The results of sandbox simulations were used to calibrate the performance of the numerical model, especially the coupled hydro-mechanical analysis. The stability of jointed rock slopes under different persistence and various water pressure conditions has been studied. It is believed that the study can enhance the way for stability analysis and monitoring of the potential failure of jointed rock slopes.</p><p>Keywords: Wedge failure; Joint persistence; Groundwater; Rock slope stability.</p><p> </p>

scholarly journals Study on the Stability of Slopes Reinforced by Composite Vegetation Combined with a Geogrid under Rainfall Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Qizhi Hu ◽  
Yong Zhou ◽  
Gaoliang Tao
Keyword(s):  
Southern China ◽  
Maximum Displacement ◽  
Protection Effect ◽  
Tree Distribution ◽  
Stability Of Slopes ◽  
Protection Method ◽  
Ecological Protection ◽  
Reinforced Slopes ◽  
The Stability ◽  
Dense Tree

The planting of shrubs and trees on geogrid-reinforced slopes is an important ecological slope protection method that is frequently implemented in the rainy areas of southern China. First, this paper analyzes the soil-fixing principle of the geogrid and root system and demonstrates the feasibility of using composite vegetation of shrubs and trees to reinforce the slope with a geogrid. Using the Yushi Expressway project in Guizhou, we conducted a stability analysis of slopes under different working conditions and different reinforcement modes. We determined that the ecological protection method of combining composite vegetation with a geogrid can effectively increase the stability of slopes. The maximum displacement of the ecological slope under rainfall conditions was reduced by 82% compared with the original slope, and the overall stability was improved by 35%. Four factors affect the slope stability: the depth of shrub reinforcement, depth of anchorage of trees, distribution of trees, and spacing of the geogrids. An orthogonal analysis considering these 4 factors with 3 levels was implemented. The following optimal combination was obtained to ensure ecological protection under rainfall conditions: a shrub reinforcement depth of 0.6 m, a tree anchorage depth of 3 m, a grid spacing of 0.4 m, and a top-sparse and bottom-dense tree distribution. The combined slope protection schematic was applied to the Yushi Expressway project in Guizhou, and a strong reinforced slope protection effect was observed.

scholarly journals A review of the relation between climate variability and mass removal processes

2021 ◽  
Vol 17 (1) ◽  
pp. 1-40
Author(s):  
LUIS CARLOS LEGUIZAMÓN BARRETO ◽  
JULY ROJAS
Keyword(s):  
Climate Variability ◽  
Probabilistic Models ◽  
Climatic Variability ◽  
National Level ◽  
Slope Instability ◽  
Mass Removal ◽  
Stability Of Slopes ◽  
Removal Processes ◽  
The Stability

This literature review article is a product of the Research Project “Relation Between Climate Variability with Mass Removal Processes. Tunja-Páez case study”, developed in the Universidad Pedagógica y Tecnológica de Colombia in the year 2020. Introduction: This article focuses on the review of research studies and advances made during the last decade regarding the influence of climatic variability on the dynamics of slopes. Objective: To determine the influence of climatic variability in areas that present slope instability in the Tunja-Páez road corridor located in the department of Boyacá. Methods: A systematic review of information from books, manuals, reports, guides, and scientific articles on climate change, climate variability, mass removal processes, meteorological variables, and their influence on the resilience and adaptation of infrastructure related to containment and slope drainage projects. Results: The studies indicate criteria that relate temperature, precipitation and seismic activity with the occurrence of mass movements. Conclusion: Climatic anomalies in terms of precipitation and temperature has allowed research methodologies using probabilistic models to be developed for estimating the occurrence of said phenomena in future scenarios. Originality: The presented literature indicates the influence of climatic variability in the resulting mass removal processes as evidenced in studies at the global and national level. Limitations: This article scientific studies have been compiled that contrast the problems in the stability of slopes of the Tunja-Páez road corridor, without going into the details of these problems.

scholarly journals Numerical investigation into the stability of earth dam slopes considering the effects of cavities

2019 ◽  
Vol 37 (4) ◽  
pp. 1397-1421
Author(s):  
Hawraa Alateya ◽  
Alireza Ahangar Asr
Keyword(s):  
Finite Element ◽  
Vertical Direction ◽  
Simulation Models ◽  
Horizontal Direction ◽  
Earth Dam ◽  
Earth Dams ◽  
Content Type ◽  
Finite Element Software ◽  
Stability Of Slopes ◽  
The Stability

Purpose This study is an attempt to estimate the influence of the presence of cavities on the stability of slopes in earth dams under rapid drawdown conditions. The purpose of this paper is to study the influence of different factors, such as the diameter and location of cavities, in addition to their existence effects. Design/methodology/approach A series of finite element simulation models were developed using PLAXIS 2D finite element software to analyse the stability of slopes in earth dams while considering various effects from cavities in the subsoil under rapid drawdown conditions. Findings The results indicated that the presence of cavities and an increase in the diameter of cavities decreased the stability of the upstream face dramatically for all examined locations in a horizontal direction; however, this effect was less on the downstream side. The results also showed that variations in the location of cavities in the horizontal direction have a greater effect on the stability than those in the vertical direction. The results revealed that increasing shear strength parameters of embankment does not reduce the influence of cavities on stability when those cavities are in critical locations. Originality/value A numerical model has been developed to simulate the effects of cavities on the stability of slopes in water-retaining structures/earth dams. The stability of earth dam slopes on upstream and downstream sides under rapid drawdown conditions considering various cavity effects, including their existence, diameter and location, were numerically analysed.

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