variety of methods including traditional factor of safety approaches, including BS (BSI, ) and (BSI, ), CIRIA C (Phear et al, ) . Publisher: CIRIA. Soil nailing is a technique where either natural ground or fill material is reinforced by the insertion of slender tension-carrying elements called . thread Hi, My dissertation is within the scope of nailing in soils. I would like to consult the book mentioned in the topic title with the.

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The design of a soil nailed system for slope stabilization will be improved, if the pullout resistance can be more accurately estimated. The behaviour c367 grouted nails in the field is influenced by a number of uncertain factors, such as variations in the water content and soil properties, quality of cement grout, and uncontrolled test parameters including vertical overburden pressure, grouting pressure, and roughness of a drilled hole.

Turner and Jensen reported the application of soil nailing in the stabilization of active landslides. The Eng-Tips staff will check this out and take appropriate action.

PUB C Soil nailing – best practice guidance, CIRIA – Publication Index | NBS

A uniform surcharge was applied at the top of the slope. But this stress increase in the soil far away from the soil nail has a less distinct interface, such as at the locations of P-Cells 5 and 6. The volumemeter, connected to the top rubber bag for overburden pressure cirua, monitored the water volume change in the rubber bag during testing. Hong Kong c37 a substantial portion of urban developments located on or near steep hillsides, resulting in the creation of 57, sizable man-made slopes.

Furthermore, the evaluation of soil nail resistance at the ultimate state other than in a progressive way is the focus of most studies, even though the loads on the soil cigia are mobilized gradually, in accordance with the soil deformation.

Offers guidance on the design, construction, testing and maintenance for soil nailing used on walls and slopes. It seems that the displacements at the two peak values are different.


The steel rebar was 40mm in diameter and 1. The interface direct shear tests Su showed that the friction between the flexible plastic film and the inside surface of the box was only 6. The influence of both grouting pressure and overburden pressure on the soil nail pullout interface shear resistance is cirua not well understood owing to the complexity of soil-grout interactions.

Before the test, a flexible plastic film was used to cover the inner surfaces of the box, as shown in Figure 4. The nails were relatively closely spaced and grouted into pre-drilled holes. Juran and Elias reported that for cohesionless soils, grouting pressures of to kPa were commonly used to prevent caving as the casing would be withdrawn.

It was his supports and experienced guidance that made this work possible. Don’t have an account? Approximately pullout tests were also performed on nails under various overburden pressures. Close this window and log in. Many authors such as Jewell and WrothPedleyBarr et al. Tei carried out series of soil nail pullout tests in c6377 types of sands using a mm long, mm wide and mm high pullout box, as shown in Figure 2.

Thus, previous pullout test results can be used for comparisons ciriw those of the present study. By joining you are opting in to receive e-mail. Literature Review the analysis of a soil nailed system, no matter which method is used, the simulation of the interaction between the soil nail and the ground is an important factor that influences the result of soil nail pullout resistance, and hence the factor of safety of the whole soil nailed system.

Soil nailing – best practice guidance (C637)

The soil nailing design method in Hong Kong is based on limit equilibrium approach Powell and Watkinswhere only the contribution of tensile pullout resistance ciri the nail reinforcement in the passive zone is considered. Before insertion of the steel bar, 4 strain gauges and a series of FBG sensors were attached on the bar surface, as shown in Figure 4.

The soil plasticity index Ip is In Hong Kong, soil nails are extensively used for slope improvement works. The waterproof triaxial cell has two functions: Cirix the stresses around the soil nail were increased to a higher level during the saturation, the effect of soil dilation in a saturated condition would be smaller than that at a lower stress level in an unsaturated condition.


Soil nailing – best practice guidance (C)

The possible reasons are: Creep displacements and the force distribution changes in the nails caused by creep effects were observed. In addition, this model can clearly demonstrate the influences of a few key parameters, such as soil dilation, soil nail bending, and soil modulus of subgrade reaction, which are of great interests to engineers.

Monitoring can provide knowledge of the performance of the structure, verify design assumptions and parameters, and enhance understanding on the mechanism of soil nails.

The stresses and pore water pressures developed in the soil, the pullout force and displacement of the soil nail, and the strains developed along the soil nail are plotted for each phase of the experiment.

It can be seen that, although the applied grouting pressure of kPa in the grouting barrel was kept for 30 mins, the increased pressure at P-Cells 1, 2, 3 and 4 is only maintained for about 10 mins and then decrease, with time, to stable values. Want access to British Standards? All the pullout tests were conduced in a saturated condition. In the shear box apparatus, as the nail length is relatively too small to generate a large axial force, the nail bending makes a larger contribution to the shear resistance of the soil-nail interface.

This installation technique is rapid 4 to 6 per hour and causes little ground disruption. Xiria can be seen that the calculated shear stresses on the nail surface are distributed unevenly along the soil nail.

The locations of the strain gauges and FBG sensors are shown in Figure 4. It is found that both overburden pressure and grouting pressure have influences on soil nail pullout resistance, and their influences are interactional.