Analysis of Engineering Interventions on Various Soil Combinations using PLAXIS-2D

Abstract

Slope Stability is a fundamental concept in geotechnical engineering as it plays an important role in the safety and sustainability of civil infrastructures. Rapidly increasing population and the demand of urbanization has made it necessary to utilize all the available area in different terrains. This makes it necessary to study the stability of slopes. The objective of this study is to analyse the stability of slopes with different soil combinations. It also sheds light on the changes in the displacement values when we use engineering methods, retaining wall, Diaphragm wall & anchors and geotextile. This study also shows the changes when loading conditions are applied on the soil combinations. To carry out this research we are using PLAXIS 2D, a finite element analysis software.

Introduction

I. INTRODUCTION

Slope Stability in the simplest terms refers to the capacity of a slope, natural or man-made, to resist deformation. A previously stable slope can also become unstable due to various reasons. Some factors that could potentially be the reason for instability of slopes are increased loading or lateral pressure, weathering or any changes in pore water pressure. For the safety and long-term viability of civil infrastructure, the stability of slopes is very crucial. Slope failures can cause minor as well as severe accidents which can lead to human as well as environmental safety risks. This work focuses on the analysis of slope stability of various soil combinations with various engineering methods and loading conditions with the help of PLAXIS 2D, a finite element analysis software.

II. OBJECTIVE

1. The objective of this study is to analyze the total maximum displacement of various soil combinations using PLAXIS 2D.
2. To study the displacement when retaining wall, diaphragm wall & anchors and geotextile are used.
3. To study the displacement when loading conditions are applied.

III. LIST OF CASES

The list of cases used for this study is given below:

1. Case 1: Loam (Upper Layer) + Sand (Lower Layer)
2. Case 2: Loam (Upper Layer) + Clay (Lower Layer)
3. Case 3: Peat (Upper Layer) + Loam (Lower Layer)
4. Case 4: Peat (Upper Layer) + Clay (Middle Layer) + Clay (Lower Layer)
5. Case 5: Loam (Upper Layer) + Sand (Middle Layer) + Clay (Lower Layer)
6. Case 6: Sand (Upper Layer) + Peat (Middle Layer) + Clay (Lower Layer)

IV. METHODOLOGY

The project work is divided into two sections with all six cases under each section.

Section 1: For the first part, we have the different soil combinations as listed in the list of cases. All the cases are in drained condition. They are analysed using the PLAXIS 2D software and the total maximum displacement is recorded for each case. Then we apply retaining wall, diaphragm wall & anchors and geotextile to compute the displacement values once more, individually. Comparison is then made among all three values.

Section 2: In the second part, the soil combinations are analysed under loading conditions. The load value taken in this study is 10kN/m. Again, retaining wall, diaphragm wall & anchors and geotextile are applied on the soil combinations under varying loading conditions. The recorded values of total displacement can then be compared.

Conclusion

All the conclusions derived based on the analysis of various soil combinations is summarized below: 1) A total of six cases with different soil combinations in upper, middle and lower layer were analyzed to find the total maximum displacement. 2) When no load was applied, Case 1 has the highest percentage change in total maximum displacement. It means that the displacement for this soil combination has decreased and the stability has increased while using engineering methods. 3) When a load of 10kN/m was applied, Case 4 has the highest percentage change in total maximum displacement. It means the displacement has decreased and stability has increased with the application of engineering methods. 4) Use of engineering methods to increase the stability of any slope can be very beneficial as it can help decrease the total maximum displacement.

References

[1] Alex Jacob, Ammu Anna Thomas, Aparna G Nath, Arshiq MP, “SLOPE STABILITY ANALYSIS USING PLAXIS 2D”, International Research Journal of Engineering and Technology (IRJET), Volume: 05 Issue: 04, Apr-2018, e-ISSN: 2395-0056. [2] Akshat Agarwal, Anurag Kumar, Shambhavi Chaturdevi, “Analysis of Embankments Reinforced With Geotextile”, International advanced research journal in science, engineering and Technology, Volume 10, Issue 5, May 2023, ISSN: 2393-8021 [3] Bidisha Chakrabarti, Dr. P. Shivananda, “TWO-DIMENSIONAL SLOPE STABILITY ANALYSIS WITH VARYING SLOPE ANGLE AND SLOPE HEIGHT BY PLAXIS-2D”, Journal of Emerging Technologies and Innovative Research (JETIR), Volume 4, Issue 11, November 2017, ISSN-2349-5162. [4] Kelvin Lim, A.J. Li, Andrei V. Lyamin, “Slope Stability Analysis for Filled Slopes Using Finite Element Limit Analysis Method”, Geotechnical Special Publication, Geo-Shanghai 2014 Conference, May 2014. [5] Ms.Hridya P, Abhay Kp, Amain P, Anamika C, Anjali Mathew, 2024, Slope Stability Analysis by Using Plaxis 2d in Kudiyanmala, International Journal Of Engineering Research & Technology (IJERT) Volume 13, Issue 03 (March 2024). [6] Mukthar V Basheer, Rajat Ravi, Sreedevi S, Sreelakshmi S,” Stability Analysis of Different Soilfil on Embankment Subgrade using Plaxis-2d”, International Journal of Engineering Research & Technology (IJERT), Volume 9, Issue 9, Special Issue – 2021, ISSN: 2278-0181

Copyright

Copyright © 2024 Aditya Meena, Alka Maurya, Khushi Thakur, Kongan Aryan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.