A Study of Soil-Reinforcement Interface Friction

Wang, Zhenggui; Richwien, Werner

doi:10.1061/(asce)1090-0241(2002)128:1(92)

Cited by 61 publications

(14 citation statements)

References 6 publications

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“…Seo et al (2012) suggested the ultimate skin friction of a soilnail in cohesive soil utilising the initial suggestion proposed by Wang and Richwien (2002), as shown in Equation 10.…”

Section: Geotechnical Engineering Volume 170 Issue Ge6mentioning

confidence: 99%

“…Therefore, the Japan Geotechnical Society (JGS, 2000) empirically proposed the ultimate skin friction (τ f ) based on the standard penetration test (SPT)-N value. Wang and Richwien (2002) suggested a theoretical equation that considers soil dilation to obtain the ultimate skin friction. Seo et al (2012) modified this theoretical solution to make it suitable for use with cohesive soils.…”

Section: Introductionmentioning

confidence: 99%

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Net load–displacement estimation in soil-nail pullout tests

Seo

Pelecanos²,

Kwon³

et al. 2017

Proceedings of the Institution of Civil Engineers - Geotechnica

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Soil-nails are used to stabilise a soil mass by exploiting the resistance generated by the skin friction between the ground and grout and the tensile stiffness of the reinforcing material. A load-displacement curve is obtained from in situ pullout load tests performed by considering the elastic shear modulus and ultimate skin friction capacity between the soil and grout. This study determines the shear behaviour between the soils and grout analytically, especially the soil-dilation effect during shearing that is one of the main factors affecting the ultimate skin friction, even though this estimation is rather cumbersome. Many studies assume a full bond between the grout and the steel reinforcing bar, thus neglecting their relative displacement. In this study, the net load-displacement between the ground and grout is obtained by subtracting the nail elongation from the load-displacement of the pullout tests when estimating the shear displacement. Numerous field pullout tests are performed in this study under various ground conditions and through various construction methods. The dilatancy angles are estimated dependent on the soil type by comparing the net load-displacement curve obtained in the field with that obtained theoretically.

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“…Seo et al (2012) suggested the ultimate skin friction of a soilnail in cohesive soil utilising the initial suggestion proposed by Wang and Richwien (2002), as shown in Equation 10.…”

Section: Geotechnical Engineering Volume 170 Issue Ge6mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Net load–displacement estimation in soil-nail pullout tests

Seo

Pelecanos²,

Kwon³

et al. 2017

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

show abstract

“…These reported works include the popular pullout test for soil nails, as conducted by McDonald & Ims [16], Su et al [17] and Pei et al [18]. In addition, Wang & Richwien [19] examined the soil-nail interface friction, while Yin et al [20] investigated the effect of grouting pressure on the pullout resistance of a manmade compacted decomposed granite fill. Also, Yin & Xu [21] reported on the expedience of installing soil nail for supporting a foundation pit.…”

Section: Introductionmentioning

confidence: 99%

Screw-in Soil Nail for Slope Reinforcement Against Slip Failure: A Lab-Based Model Study

Chan¹

2017

geomate

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Slope failures occur when the shear resistance along the slip plane is exceeded. This can be caused by excessive load imposed at the slope crest or compromised stability of the slope, e.g. disturbed dimensions of the slope. In order to prevent slope failure, stabilisation or reinforcement measures need to be taken. A common solution is to intercept the slope failure plane with reinforcement elements, such as soil nails and ground anchors. In soil nailing, reinforcement bars are installed on the slope to effectively resist the additional shear forces from the imposed loads, hence reducing the probability of failure in the long run. This paper describes the innovation of soil nail with screw-in installation mechanism instead of the conventional push-in approach. The screw-in installation ensures better soil-nail grip and less disturbance during the slope stabilisation procedure, especially in terms of noise and spoils. In addition, the novel nail has a hollow stem which improves shear resistance with greater soil-nail surface contact on the inner wall. The opening at the nail head also enables displaced air to escape as the nail is screwed into the slope and soil pushed into the inner hollow cavity. The prototype nails were tested in a slope model with different configurations, and were found to reduce the Angular Distortion Ratio by 37 % and the Volumetric Deformation Index as much as 33 % respectively. The novel screw-in soil nail could be potentially used to stabilize natural and man-made slopes, though full-scale simulations are recommended to formulate the installation procedure and to validate the effectiveness.

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“…They found out that the apparent coe cient of bond friction between nails and soil was a ected by the friction angle of the soil, the rate of soil dilation during shear, the sti ness of the soil, and diameter of the nail in relation to mean particle size of the soil [9]. Wang and Richwien [10] also studied the friction mobilized between the soil and nails by comparing results of pull-out tests and direct shear tests. They observed that the mobilized friction between soil and nails was mainly dependent on the elastic parameters of the soil and its dilatancy angle.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the static behavior of stepped soil nail walls

Ahmadi

Borghei

2017

Scientia Iranica

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This paper presents a numerical investigation into the static behavior of stepped soil nail walls constructed in dry sandy soils. The nite element method was used to study in uence of wall geometry and soil parameters on behavior of the walls. We analyzed walls with heights of 10, 15, and 20 m. This study shows that the wall deformation and the nail tensile forces of the stepped soil nail wall are smaller than those of the typical soil nail wall. If properties of soils such as friction angle, cohesion, and elastic modulus decrease, more decrease in the wall lateral displacement and nail tensile forces of a stepped soil nail wall would occur. Therefore, stepped soil nail walls are more e ective in soft soils than in hard soils. When a step is located at the middle of the wall height, the wall lateral displacement and nail tensile forces are minimized; hence, the ratio of the optimal step depth to the wall height is 0.5. As the step width increases, the wall deformation and nail forces decrease. Numerical analysis demonstrates that the minimum step width is approximately 0.1 times the wall height.

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A Study of Soil-Reinforcement Interface Friction

Cited by 61 publications

References 6 publications

Net load–displacement estimation in soil-nail pullout tests

Net load–displacement estimation in soil-nail pullout tests

Screw-in Soil Nail for Slope Reinforcement Against Slip Failure: A Lab-Based Model Study

Numerical investigation of the static behavior of stepped soil nail walls

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