scholarly journals SLOPE STABILITY ANALYSIS CONSIDERING WEIGHT OF TREES AND ROOT REINFORCEMENT

2019 ◽  
Vol 27 (4) ◽  
pp. 201-208
Author(s):  
Majid Lotfalian ◽  
Mehran Nasiri ◽  
Amir Modarres ◽  
Wei Wu
Keyword(s):  
Slope Stability ◽  
Soil Type ◽  
Soil Reinforcement ◽  
Tree Age ◽  
Stability Factor ◽  
Slope Stabilization ◽  
Root Reinforcement ◽  
Root Cohesion ◽  
The Stability ◽  
Old Trees

We study the effect of roots of alder trees on soil reinforcement and slope stabilization. Two types of soil, i.e. Marl and Clayey soils and alders of three ages are considered. The slope stability is studied according to the tree indices based on tree age and soil type. The effect of root reinforcement on slope stability is considered by an additional cohesion. The stability analyses are carried out by the FEM. We perform parameter studies considering tree age, soil type and surcharge. The results indicate that soil type is effective on cohesion. The results also showed that with increasing age of trees from 7 to 15 years, the amount of additional root cohesion increased and with the increase of the age of trees to 20 years this amount slightly decreased. Also, with regard to a constant slope geometry, the type of soil and the uniform surcharge pressure, 7-year-old trees have shown better performance in slope stabilization. It has been observed that as the age of alder trees grows, although the amount of additional root cohesion increases, however, due to increased surcharge pressure, the overall slope stability factor decreases.

Root reinforcement in plantations of Cryptomeria japonica D. Don: effect of tree age and stand structure on slope stability

2008 ◽  
Vol 256 (8) ◽  
pp. 1517-1526 ◽  
Author(s):  
Marie Genet ◽  
Nomessi Kokutse ◽  
Alexia Stokes ◽  
Thierry Fourcaud ◽  
Xiaohu Cai ◽  
...  
Keyword(s):  
Slope Stability ◽  
Cryptomeria Japonica ◽  
Stand Structure ◽  
Tree Age ◽  
Root Reinforcement

scholarly journals FUNCTION OF INTERCEPTION, EVAPOTRANSPIRATION AND ROOT REINFORCEMENT OF PLANT ON SLOPE STABILIZATION

2020 ◽  
Vol 15 (1) ◽  
pp. 19-26
Author(s):  
Euthalia Hanggari Sittadewi
Keyword(s):  
Slope Stability ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Tree Canopy ◽  
Shear Stresses ◽  
Slope Stabilization ◽  
Root Reinforcement ◽  
Soil Shear Strength ◽  
Positive Effect

The ability of plants to carry out the functions of interception, evapotranspiration and root reinforcement provides an effective and contributes to an increase in slope stability. Canopy has a role in the process of interception related to the reduction of amount the infiltrated water and the rapid fulfilment of soil moisture. Through the evapotranspiration mechanism, plants can reduce pore water pressure in the soil so that the trigger force for landslides can be reduced and the soil will be more stable. The roots mechanically strengthen the soil, through the transfer of shear stresses in the soil into tensile resistance in the roots. Roots also bind soil particles and increase surface roughness, thereby reducing the process of soil displacement or erosion. There is a positive relationship between the density of the tree canopy with the value of rainfall interception, evapotranspiration with a decrease in pore water pressure in the soil and the ability of root anchoring and binding with an increase in soil shear strength, indicating that the function of interception, evapotranspiration and strengthening of plant roots have a positive effect on increasing slope stability. Plants selection that considers the level of interception, the rate of evapotranspiration and root reinforcement by adjusting environmental and slopes conditions will determine the success of slope stabilization efforts by vegetative methods.Keywords : interception, evapotranspiration, root reinforcement, slope stabilization.

scholarly journals Soil Effects on Stem Growth and Wood Anatomy of Tamboril Are Mediated by Tree Age

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1058
Author(s):  
Talita dos Santos Angélico ◽  
Carmen Regina Marcati ◽  
Sergio Rossi ◽  
Magali Ribeiro da Silva ◽  
Júlia Sonsin-Oliveira
Keyword(s):  
Soil Type ◽  
Wood Anatomy ◽  
Tree Age ◽  
Soil Conditions ◽  
Plant Soil ◽  
Wood Traits ◽  
Soil Effects ◽  
Old Trees ◽  
The Relationship ◽  
Effect Of Age

Soil influences the growth of trees and the characteristics of the wood; but could this influence change during the ontogeny of trees? To answer this question, we analyzed the wood anatomy of 9-year-old trees and 2-year-old saplings of Enterolobium contortisiliquum, known as “tamboril”, growing in eutrophic and oligotrophic soil in the Brazilian Cerrado, and assessed the effect of age on plant–soil relationship. Sapwood samples were collected from the main stem, anatomical sections were prepared in the lab, and 12 anatomical wood traits were measured. Individuals in eutrophic soil had greater stem diameter and height than those in oligotrophic soil. Trees in eutrophic soil had vessel-associated parenchyma cells with abundant storage compounds. Fibers walls were 47% thicker and intervessel pits diameter were 14% larger in trees of eutrophic soil. A greater proportion of solitary vessels (74%) was observed in trees rather than in saplings (50%). The secondary xylem of trees was mainly formed by fibers (63%) whereas in saplings it was mainly formed by storage tissue (64%). Our study provides evidence that the influence of soil conditions on tree growth reflects variations in wood anatomical features. No significant response to soil type was observed in saplings, thus demonstrating that the relationship between soil type and wood growth is mediated by tree age. These findings help to develop reliable reforestation strategies in tropical ecosystems characterized by different levels of soil fertility.

scholarly journals Pengaruh Biopolimer Pada Stabilitas Lereng Swelling soil

2021 ◽  
Vol 5 (3) ◽  
pp. 307-316
Author(s):  
Dewi Amalia ◽  
Bagus Guritno ◽  
Geni Firuliadhim
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Soil Type ◽  
Analysis Program ◽  
Swelling Soil ◽  
The Difference ◽  
The Stability ◽  
Cracked Soil

Many studies have begun to develop the concept of cracked soil. The results of research related to cracked soil are able to answer the irregularities that occur, such as the difference in the results of the stability analysis which is considered safe with the conventional bishop method, while the conditions in the field are landslides. Swelling soil is soil that is susceptible to changes in water content. This type of soil is very prone to cracking. To build infrastructure on the swelling soil type, an improvement must be made, one of which is by mixing the swelling soil with biopolymer. The results of this biopolymer mixing are then modeled in the New Slope Stability Analysis Program (NSSAP) 1.0 which refers to the concept of cracked soil. From the analysis, it was found that the slope safety factor before improvement with biopolymer was 0.305 and the safety factor after improvement with biopolymer was 2.006. From the results of this study, it can be seen that the role of biopolymers in stabilizing swelling soil is quite large, which is around 558%.

Analysis of the Relative Position of the Slope and Underground Mining Area and its Influence Properties

2013 ◽  
Vol 634-638 ◽  
pp. 3277-3281 ◽  
Author(s):  
Shi Guo Sun ◽  
Hong Yang ◽  
Chun Sheng Li ◽  
Bao Lin Zhang ◽  
Jia Wang ◽  
...  
Keyword(s):  
Slope Stability ◽  
Underground Mining ◽  
Mining Area ◽  
Open Pit ◽  
Stability Factor ◽  
Mining Depth ◽  
Extracellular Region ◽  
Geological Conditions ◽  
Slope Rock ◽  
The Stability

The stability state of slope rock mass is relating to each other’s relative location during the transformation from open-pit to underground mining, it’s the most disadvantageous influence on the slope stability when the underground mining area is located in the toe of slope, and it’s the best influence as in the slope extracellular region. Slope stability factor changes with the geometric dimensions of underground mining increased, but not in direct proportion. Under the condition of constant geometric dimensions of mining area, the influence on slope stability is changing with the mining depth increased. Thus indicating that the influence on slope stability by underground mining has its spatial property, and to determine the specific influence value requires a combination of many factors, such as the relationship of relative spatial position, the geometric dimensions of mining area, engineering geological conditions and so on.

Slope Stability Comparatively Analyzed with 2D and 3D FEM

2012 ◽  
Vol 220-223 ◽  
pp. 2908-2911
Author(s):  
Jie Qun Liu ◽  
Jin Long Liu
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
3D Model ◽  
Model Analysis ◽  
Stability Factor ◽  
Surface Load ◽  
3D Fem ◽  
The Stability ◽  
2D And 3D ◽  
2D Model

A typical slope has been comparatively analyzed with 2D and 3D FEM, it is showed that the length of surface load at top surface of slope shorted, the stability factor of slope of 3D model increased, which is far more than that of 2D model. In a certain degree, the safety factor got by 3D model is bigger than that of 2D model, so the safety factor of slope is underestimated by 2D model analysis sometimes.

Determination of Critical Height of Slope Filled by Red-Bed Soft Rock under Seismic Loading

2011 ◽  
Vol 261-263 ◽  
pp. 1655-1659
Author(s):  
Guo Xiong Wu ◽  
Xiang Shou Chen ◽  
Jing Sheng Ding ◽  
Wang Fei Ding
Keyword(s):  
Slope Stability ◽  
Soft Rock ◽  
Seismic Loading ◽  
Stability Factor ◽  
Critical Height ◽  
Seismic Loadings ◽  
Linear Slope ◽  
The Stability ◽  
Fill Slope ◽  
Red Bed

The combined influence of the earthquakes and the widespread red-bed soft rock as fill material necessitates the increasing attention on the slope stability in the west region of Yunnan province. To determine the critical height of slope filled by such soft rock under seismic loading, this paper establishes a model simulating a fill slope based on the finite element method and the strength reduction theory. The influence of different slope configurations, including different slope ratios, heights, and side forms on the slope stability is analyzed, and with the stability factor equal or greater than 1.1 as designated in the specifications, the slope critical heights are back calculated. The results show: (1)seismic loading has a significant influence on the slope stability, although its decreasing magnitude slows down with the increase of the slope height.; (2)the fill slope 16m in height is most instable under seismic loading, so the slope at or greater than 16m high is not recommended; (3)whatever the loading forms on the slope, either under the gravity loading only or the combined gravity and seismic loadings, the linear slope is most instable, with increasing stability for concave and step slopes.

scholarly journals Analisis Stabilitas Lereng Dengan Perkuatan Geotekstil Woven Akibat Pengaruh Termal Menggunakan Metode Elemen Hingga. (Hal. 61-72)

2019 ◽  
Vol 5 (2) ◽  
pp. 61
Author(s):  
Imron Maulana Fauzi ◽  
Indra Noer Hamdhan
Keyword(s):  
Thermal Expansion ◽  
Stability Analysis ◽  
Slope Stability ◽  
Thermal Effect ◽  
Thermal Capacity ◽  
Soil Reinforcement ◽  
Effect Analysis ◽  
Soil Parameter ◽  
Embankment Slope ◽  
The Stability

ABSTRAKAda beberapa jenis perkuatan tanah untuk mengantisipasi longsoran yang sering digunakan di Indonesia seperti halnya geotekstil. Analisis stabilitas dilakukan pada lereng timbunan dengan kemiringan 1V:1H, 1V:1,5H dan 1V:2H dengan membandingkan kondisi lereng timbunan tanpa perkuatan geotekstil, lereng timbunan dengan perkuatan geotekstil serta lereng timbunan dengan perkuatan geotekstil yang dipengaruhi oleh termal menggunakan software PLAXIS 2D 2017. Analisis pengaruh termal dilakukan dengan memvariasikan besaran nilai suhu dan parameter termal tanah (kapasitas, konduktivitas dan ekspansi). Terjadi penurunan stabilitas lereng timbunan dengan perkuatan geotekstil yang diakibatkan oleh semakin besarnya nilai suhu termal dan terjadi peningkatan stabilitas lereng dengan perkuatan geotekstil akibat meningkatnya nilai ekspansi termal, sedangkan nilai konduktivitas dan kapasitas termal tidak berpengaruh.   Kata kunci: lereng timbunan, geotekstil, stabilitas, suhu, parameter termal tanah. ABSTRACTThere are several types of soil reinforcement to anticipate landslide that are often used in Indonesia as well as geotextile. The stability analysis is carried out on the slope of the embankment with a slope of 1V:1H, 1V:1,5H and 1V:2H by comparing the slope conditions of the embankment without geotextile reinforcement, slope of embankment with geotextile reinforcement and slope of embankment with geotextile reinforcement that influenced by thermal using PLAXIS 2D 2017. The thermal effect analysis is carried out by varying the value of temperature and soil thermal parameters (capacity, conductivity and expansion). There is a decrease in the stability of the embankment slopes with geotextile reinforcement caused by the increasing thermal temperature value and an increase in slope stability with geotextile reinforcement due to the increase of thermal expansion value, while the conductivity and thermal capacity have no effect.Keywords:  embankment slope, geotextile, stability, temperature, thermal soil parameter.

Seismic and static 3D stability of two-stage rock slope based on Hoek–Brown failure criterion

2016 ◽  
Vol 53 (3) ◽  
pp. 551-558 ◽  
Author(s):  
X.-L. Yang ◽  
Z.-X. Long
Keyword(s):  
Slope Stability ◽  
Objective Function ◽  
Rock Slope ◽  
Seismic Stability ◽  
Dissipated Energy ◽  
Inertia Force ◽  
Stability Factor ◽  
Two Stage ◽  
Stability Of Slopes ◽  
The Stability

Two-stage slope is beneficial to improve slope stability in comparison with single-stage slope. Based on nonlinear Hoek–Brown criterion, a three-dimensional failure mechanism is employed to estimate the stability of two-stage rock slope, with the effect of seismic inertia force being taken into account. A generalized tangential technique is used to formulate the stability factor problem as a classical optimization problem corresponding to the dissipated energy. The upper-bound solutions are obtained by minimizing the objective function with respect to the location of sliding body center and the location of tangency point. The seismic inertia force is considered and incorporated into the objective function. In comparison with previously published solutions using the linear Mohr–Coulomb criterion, the validity of the present solutions is shown. The analytical expressions for two-stage slope are derived to estimate the seismic stability of slopes. Numerical results for different types of rocks are presented for practical use in engineering, and the effects of different parameters on slope stability are discussed.

scholarly journals CALIBRATION OF DISTRIBUTED SHALLOW LANDSLIDE MODELS IN FORESTED LANDSCAPES

2010 ◽  
Vol 41 (3) ◽  
pp. 23 ◽  
Author(s):  
Gian Battista Bischetti ◽  
Enrico Antonio Chiaradia
Keyword(s):  
Slope Stability ◽  
Success Rate ◽  
Stability Index ◽  
Shallow Landslide ◽  
Space Distribution ◽  
Root Cohesion ◽  
Susceptibility Maps ◽  
Index Mapping ◽  
Forested Landscapes ◽  
The Stability

<p>In mountainous-forested soil mantled landscapes all around the world, rainfall-induced shallow landslides are one of the most common hydro-geomorphic hazards, which frequently impact the environment and human lives and properties. In order to produce shallow landslide susceptibility maps, several models have been proposed in the last decade, combining simplified steady state topography- based hydrological models with the infinite slope scheme, in a GIS framework. In the present paper, two of the still open issues are investigated: the assessment of the validity of slope stability models and the inclusion of root cohesion values. In such a perspective the “Stability INdex MAPping” has been applied to a small forested pre-Alpine catchment, adopting different calibrating approaches and target indexes. The Single and the Multiple Calibration Regions modality and three quantitative target indexes – the common Success Rate (SR), the Modified Success Rate (MSR), and a Weighted Modified Success Rate (WMSR) herein introduced – are considered. The results obtained show that the target index can 34 003_Bischetti(569)_23 1-12-2010 9:48 Pagina 34 significantly affect the values of a model’s parameters and lead to different proportions of stable/unstable areas, both for the Single and the Multiple Calibration Regions approach. The use of SR as the target index leads to an over-prediction of the unstable areas, whereas the use of MSR and WMSR, seems to allow a better discrimination between stable and unstable areas. The Multiple Calibration Regions approach should be preferred, using information on space distribution of vegetation to define the Regions. The use of field-based estimation of root cohesion and sliding depth allows the implementation of slope stability models (SINMAP in our case) also without the data needed for calibration. To maximize the inclusion of such parameters into SINMAP, however, the assumption of a uniform distribution of probability of the parameters must be overtaken. In small and steep catchments where there is an intrinsic susceptibility to instability phenomena, moreover, an additional class of low probability of instability (0.81)&lt;1.0) has been proposed to better discriminate the areas classified as unstable.</p>

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