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A Typical Design of Soil Nailing System for Stabilizing a Soil Slope: Case Study

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A Typical Design of Soil Nailing System for Stabilizing a Soil Slope: Case Study ISSN (Print) : 0974-6846 Indian Journal of Science and Technology, Vol 10(4), DOI: 10.17485/ijst/2017/v10i4/110891, January 2017 ISSN (Online) : 0974-5645 A Typical Design of Soil Nailing System for Stabilizing a Soil Slope: Case Study Shamsan Alsubal, Indra S. H. Harahap and Nuraddeen Muhammad Babangida Universiti Teknologi Petronas, 32610, Seri Iskandar, Perak, Malaysia; [email protected], [email protected], [email protected] Abstract Slope failures, is a common issue in construction industry, such that engineers have to avoid its risk on human lives and properties by an appropriate technical design of stabilizing methods. Soil nail is one of such stabilization methods. In this paper, soil-nailing system was studied in terms of inclination, spacing and length to determine the most appropriate spacing were applied to a hypothetical homogenous soil slope (with inclination of 30o, 40o, 45o, 60o, 70o and 90o) and the Factorvalues forof Safety effective (FOS) stabilization was evaluated of soil in slope. each Tocase. find To the validate optimum the soil results, nail system,the optimum different soil soil nail nail angle inclination, corresponding length toand a slope of 50o was applied to a case study slope, and the FOS of the case study slope was evaluated as well. The case study slope is located at Cadangan Menjalankan Kerja-Kerja Forensik Di Persiaran Endah, Seputeh Wilayah Persekutuan Kuala slope. For soil slope with steepness of 30o, 45o, 60o, 70o, and 90o; the best FOS was found with soil nail inclination (to the horizontal)Lumpur. Results of 50 showedo, 40o, 20 thato, 15 theo, and soil 10nailso respectively. inclination; The spacing effect and of lengthsoil nails have inclination significant on effect the stability on the stability of the soil-nailed of the soil walls is slight when the degree of inclination of the soil nails varies within 5o–20o to the horizontal. The stability of the slope with deep-seated slip surface and less effect with shallow slip surface. The bond length behind the slip surface should be enoughdecreases to withallow the the increase nail to use of spacingits allowable between load. soil nails. Soil nail length has significant effect on the stability of soil slope Keywords: Landslide, Slope Stability, Soil Nails, Soil, Slope Failure 1. Introduction length of the soil nail, results in improved stability of the slope. Furthermore, soil nails delays the occurrence of Slope stability issues are amongst the main problems local deformation6. in construction industry in Malaysia because of nature The design of soil nail in loose fill slope needs to of the topography and the weather conditions. Soil nail consider static liquefaction and sliding. According to a method has gained popularity in Malaysia due to its tech- numerical study, the installation of soil nails nearly per- nical suitability, ease of construction and relative free pendicular to the slope face could lead to significant slope maintenance1. Soil nailing strengthen and improve the movement due to interface liquefaction, and this move- stability of slopes by installing a closely-spaced steel bars ment could be reduced by the provision of embedded toe into a slope and the construction process, proceeds from wall to increase the structural rigidity of the soil nail fac- top to down2–4. Soil nail are usually installed into pre- ing system along the potential slip surface7. drilled holes and grouted by grout hose under pressure; Soil nails inclination has an influence on the per- the grout transfers loads through friction to the soil nails formance of soil-nailed slopes. This is evident in an which leads to the stability of the ground5. Soil nailing experimental study conducted on the effect of soil nail significantly increase the stability of slopes. An increased inclination subjected to seepage flow at 30g; the crest *Author for correspondence A Typical Design of Soil Nailing System for Stabilizing a Soil Slope: Case Study settlement of a slope with 79o and nail inclination of 25o 3. Materials and Methods to the horizontal was found to be 4.1% of the slope height while it was 2.6% of the same slope with 10o The effect of soil nail’s inclination, length, and spacing of nail inclination8. Soil nails inclination effectiveness was examined using Slope/W software with homoge- is maximized when they are installed at their corre- nous soil slope. Then a cross-section of a case study soil sponding optimum soil-nail orientation9. Another slope was identified for a stability check, before and after numerical study conducted on the behavior of steep application of soil nails. The optimum degree of soil nails soil nailed slope under seismic conditions, indicated inclination, which yielded the highest FOS in homoge- that the magnitude of displacement was greater in neous soil slope, was compared with the optimum degree horizontally placed nails than that of inclined nails. in the case study soil slope. The analysis method used in Therefore, the installation of inclined nails for steep this analysis was Spencer’s method. slopes is a better option than the installation of hori- zontal nails10. The friction angle of the soil has the 2.1 Model Parameters to Determine the highest impact on FOS for soil-nailed slope followed Effect of Soil Nail Inclination on Slope 11 by the soil cohesion and then the nail’s length . A Stability numerical study conducted on the effect of nail incli- nation on soil nailed wall stability, found that the Several values of soil nails inclination were chosen for o variation of FOS is small when nail inclination var- this study. The inclinations varied between 15 - 60 to the o ies between 10–20o and increasing the nail inclination horizontal with an increment of 5 in each analysis. As o o o decreases the factor of safety. Nails’ length has a sig- for the hypothetical homogenous slope, 30 , 45 , and 60 nificant effect on the location of the slip surface and inclination with specific height of 15m were considered. o o the factor of safety12. Soil nails length for analysis of In addition, 70 and 90 soil slopes with specific height of preliminary cross section is estimated to be 70% of 10m were considered. These considerations were deemed the slope height and longer nails will be needed for sufficient to yield a generic representation of slope failure weaker soils which having a deep-seated slip sur- problems in Malaysia, as the considered case study slope face13. Strut nails are installed in case of surcharge or is located in Malaysia as well. The soil properties used in heavy load on the top of the soil nailed or if the walls this modeling are taken from the laboratory result of case are thick and the required bearing resistance is higher study soil shown in Table 1. The length of soil nails spac- than the bearing resistance of the soil13. ing were assumed to be 12m and 1.5m respectively. Six Designers should consider and identify all modes of rows of soil nails were applied into the slope for this mod- failure in the design of soil-nailed system under the spe- eling to determine the ideal degree of soil nail inclination cific ground and groundwater conditions. The installation by knowing the highest factor of safety. of widely spaced soil nails may not be effective in ensur- ing that the soil nails and the ground act as integral mass 2.2 Model Parameters to Determine the and avoiding local instability between the nails. Closely- Effect of Soil Nail Length on Slope Stability spaced soil nails are not economically effective and Tow slopes with 40o and 60o steepness were considered 9 difficult to install properly . The soil nail spacing should for determination of the effect of soil nail length. Six rows be close to achieve massive soil nails interaction within of soil nails, with different soil nail inclination (rang- the soil mass and it is recommended to be 1m to 2.5m in ing between 0 - 70o, with increment of 5o) were installed 14 either horizontal or vertical directions . The main objec- on the slope. The soil properties used in this modeling tive of this study is to apply the most effective design of is shown in Table 1. The proposed soil nails length were soil nails system to a case study soil slope so that the high- 15m, 12m and 8m, which corresponded to 100%, 80%, est FOS is achieved. and 53% of the slope height respectively. Table 1. Soil properties of the slope Parameter Unit Weight, γ Cohesion, C Angel of Nail spacing (KN/m3) (KN/m2) friction (m) Value 18.34 0 34o 1.5 2 Vol 10 (4) | January 2017 | www.indjst.org Indian Journal of Science and Technology Shamsan Alsubal, Indra S. H. Harahap and Nuraddeen Muhammad Babangida 2.3 Model Parameters to Determine the the application of soil nailing. The second one is to deter- Effect of Soil Nail Spacing on Slope Stability mine the FOS for the slope after the application of soil nailing for various soil nailing analysis in order to find Similar to the modeling of soil nail inclination, six rows the ideal soil nailing inclination and compare it with the of soil nails were applied into the slope for this modeling. previous part of analysis. The soil properties used in this modeling are taken from The slip surface is chosen to be along the cross-section the case study soil data shown in Table 2. The proposed G-G (SI report). The geometry of nailed slope is designed soil nails spacing were 1, 1.5, 1.8, 2 and 2.5m, these values into three cut slopes of 6m in height for each cut and 50o are similar and close to the values used in practical indus- inclination to the horizontal as shown in Figure 1.
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