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

Author(s):  
Shamsan Alsubal ◽  
Indra S. H. Harahap ◽  
Nuraddeen Muhammad Babangida
2011 ◽  
Vol 261-263 ◽  
pp. 1709-1713
Author(s):  
Meng Yang ◽  
Xiao Min Liu

This paper introduces a new failure mode pattern of soil slope – the logarithmic spiral slippery fracture. A mathematical model for the logarithmic spiral slippery fracture is established, taking the anti-shear function of the soil-nailing into consideration. The shear of soil-nailing, axial force, and the safety coefficients based on the limiting equilibrium method are derived, leading to an accurate stability analysis of the strengthening of soil slope. A case study shows that the anti-shear function of the soil-nailing can be significant and should not be ignored in engineering design.


2021 ◽  
Vol 14 (7) ◽  
Author(s):  
Chao Liang ◽  
Zhijian Wu ◽  
Xinfu Liu ◽  
Zhaomei Xiong ◽  
Tao Li

2019 ◽  
Vol 9 (4) ◽  
pp. 4469-4473
Author(s):  
D. A. Mangnejo ◽  
S. J. Oad ◽  
S. A. Kalhoro ◽  
S. Ahmed ◽  
F. H. Laghari ◽  
...  

Slope instability may be a result of change in stress conditions, rise in groundwater table and rainfall. Similarly, many slopes that have been stable for several years can abruptly fail due to changes in geometry, weak soil shear strength or as the effect of an external force. Debris flows (i.e. slope failures) take place without any warning and can have devastating results. So, it is vital to understand the slope failure mechanism and adopt safety prevention measures. Soil nailing is one of the widely used stabilization techniques for soil slopes. In this study, soil nail technique is proposed to upgrade the existing slope in clay. A parametric study was conducted to understand the effects of different nail diameter (i.e. 25mm and 40mm) and nail inclination (i.e. 200, 250, 300, 350 and 400) on slope stability. Morgenstern-Price (i.e. limit equilibrium) method was used to determine the factor of safety of the slope. It was found that the factor of safety of the existing slope improved significantly with three rows of 40mm diameter nail at an inclination of 400.


2019 ◽  
Vol 21 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Jung-Su Kim ◽  
Hyun-Su Park ◽  
Byeong-Su Kim ◽  
Seong-Wan Park

1982 ◽  
Vol 19 (3) ◽  
pp. 225-231 ◽  
Author(s):  
Y. C. Koo

Structural defects in the form of relict joints are frequently found in residual soils derived from the decomposition of igneous and metamorphic rocks. Previous studies indicate that the shear strength along relict joints is generally less than that of the intact material and therefore such joints form planes of weakness in the jointed soil. Slope designs in jointed soils, based on the strength of the intact material without considering the presence of adversely oriented relict joints, may be unsafe. The distribution of mass strength of jointed soils in the field is bimodal, with the intact strength as an upper limit and the joint strength as a lower limit; it varies with direction and with the geometry of the potential slip surface. In order to describe this behaviour, a probabilistic method to estimate the mass strength is presented and its practical application is illustrated by a case study.


2013 ◽  
Vol 779-780 ◽  
pp. 506-509
Author(s):  
Yan Shuang Feng ◽  
Dong Jing ◽  
Song Wei ◽  
Kan Liang ◽  
Xin Yue Shi

To establish a learning and communication platform of design problem and solutions among designers for eliminating repetitive design errors become an important and urgent task. The analysis report on typical design case is a technical management method, which is a reliable and effective way to solve the problem mentioned above. This article expounds the implementation of the analysis report on typical design case and makes the suggestion on future design case study.


Author(s):  
T Rajesh Senthil Kumar ◽  
Sivakumar Venugopal ◽  
Balajee Ramakrishnananda ◽  
S Vijay

This paper proposes a methodology to harvest the benefits of camber morphing airfoils for small unmanned aerial vehicle (SUAV) applications. Camber morphing using discrete elements was used to morph the base airfoil, which was split into two, three, and four elements, respectively, to achieve new configurations, into the target one. . In total, thirty morphed airfoil configurations were generated and tested for aerodynamic efficiency at the Reynolds numbers of 2.5 × 105 and 4.8 × 105, corresponding to loiter and cruise Reynolds numbers of a typical SUAV. The target airfoil performance could be closely achieved by combinations of 5 to 8 morphed configurations, the best of which were selected from a pool of thirty morphed airfoil configurations for the typical design specifications of SUAV. Interestingly, some morphed airfoil configurations show a reduction in drag coefficient of 1.21 to 15.17% compared to the target airfoil over a range of flight altitudes for cruise and loiter phases. Inspired by the drag reductions observed, a case study is presented for resizing a SUAV accounting for the mass addition due to the morphing system retaining the benefits of drag reduction.


2021 ◽  
Author(s):  
◽  
Erin Shillington

<p>New Zealanders have a proud tradition of living close to nature (clean and green). This high interface with nature in traditional New Zealand dwellings is referred to as the “quarter-acre dream” by Mitchell (1972). However, the recent intensification of New Zealand cities has resulted in higher-density, multi-unit dwellings that have little interface with nature. As Auckland alone is expected to require an additional 400,000 homes within the next 30 years, a medium-density housing model that has a high nature-dwelling interface is potentially useful in reducing urban sprawl.  In contrast, many Japanese houses are effectively integrated with nature. The number of case studies available through books, journals and on websites suggests that it is possible to group these dwellings under the heading “garden houses”. For the purpose of this research, the term “Japanese Garden House” refers to Japanese houses in which the garden is an integral part of the architecture, as opposed to a separate spatial entity.  New Zealand walk-up apartments are analysed to show how this New Zealand housing model relates to nature in addition to revealing typical design elements. Thereafter, the adaptation of the Japanese Garden House for the New Zealand context is proposed as a mechanism to further connect urban dwellings with nature, thus increasing the interface between nature and inhabited space. The significant benefits this mechanism provides, including a positive effect on psychological and physiological wellbeing, are discussed. In order to adapt the features of Japanese Garden Houses to the New Zealand context, a detailed analysis of Japanese Garden Houses is undertaken to reveal design principles and strategies that characterise this type of dwelling. The analysis is limited to houses built in the last 15 years.  An investigation, through design, is carried out to determine whether the Japanese Garden House models could be used to reconnect walk-up apartments with nature. The investigation is tested on a typical Auckland site. In a case study design, principles and strategies discovered through analysis of Japanese Garden Houses are applied and, adapted to fit walk-up apartments and the New Zealand context. The outcome is a valuable new New Zealand housing model and a set of guidelines presented as a matrix including key principles, strategies and a menu of solutions with the potential to be applied more broadly by other architects, developers and city councils.</p>


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