Some reasons for soil nailing wall’s safety and quality assurance

The soil nailing wall is a kind of technology for supporting and strengthening the in-situ soil. The soil nails are integrated with the soil around tightly, so that they can form into a type of composite soil, relying on the frictional force of contact surface. Based on the analysis of the constructional scheme of the national stadium, the key factors for controlling the quality of the construction were found. The quality system during the project should be managed strictly. And the diameter, length and strength of the anchorage ought to be executed exactly. This scheme provided reasons for the national...

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Practice of hole drilling for soil nails

Soil nail construction involves the formation of holes followed by insertion of steel reinforcement, grouting and construction of soil-nail head typically in a recess on the slope surface. In Hong Kong, drilling of a soil-nail hole is commonly carried out by pneumatic percussive rigs (Plate 1) with air as the flushing medium. Temporary casing is normally not required in the typical saprolitic soils encountered in Hong Kong. In special circumstances, a more robust drilling rig, for example, the Odex type drilling equipment, is used for driving temporary casing into a hole concurrent with drilling to prevent the hole from collapsing...

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Suitability of soil nailing with respect to soil types

As soil nail construction requires temporary stability in both the staged excavation and also the drilled hole stability, any soils with sufficient temporary self-support of about 2m sub-vertical height for minimum of 1 to 2 days and hole stability for minimum four hours are considered suitable ground for soil nailing. With the above criteria, the following soil types would be suitable for soil nailing: i. Stiff fine/cohesive soils ii. Cemented granular soils iii. Well graded granular soils with sufficient apparent cohesion of minimum 5kPa as maintained by capillary suction with appropriate moisture content iv. Most residual soils and weathered rock...

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Design procedures of soil nail wall

The global stability of soil nail walls is commonly evaluated using two-dimensional limit equilibrium principles, which are used for conventional slope stability analyses. In practise, different shapes of the failure surface behind the soil nail wall have been considered in various methods to analyze the global stability of soil nail walls. Some of these shapes of the failure surfaces include: (1) planar , (2) bi-linear with a two-wedge slipping mass (e.g., German method as in Caltrans, 1991), (3) parabolic , (4) log spiral , and (5) circular . Numerical comparisons among different methods show that differences in the geometry of...

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Design on soil-nailing wall Supporting of Foundation Pit in Bao Tou

Project Summary Proposed site is located in the north of the west of the east river road at bao tou . The side of the building has leisure square and commercial shop and underground garage on the north and south of village .The excavation depth is11 meters . Engineering geology According to the geological survey report, the soil is divided into miscellaneous fill,collapsible loess, silt, coarse sand. The physical and mechanical indexes of soil are shown in table 1. Table 1 Physical and mechanical properties of soils Layer soil type name Layer thickness(m) Severe(kN/m3) cohesive force(kPa) Angle of internal friction(°)...

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Hampton Roads Bridge-Tunnel

The Hampton Roads Bridge-Tunnel (HRBT) is a 3.5-mile (5.6 km)-long Hampton Roads crossing for Interstate 64 and U.S. Route 60. It is a four-lane facility comprising bridges, trestles, man-made islands, and tunnels under the main shipping channels for Hampton Roads harbor in the southeastern portion of Virginia in the United States. It connects the historic Phoebus area of the independent city of Hampton near Fort Monroe on the Virginia Peninsula with Willoughby Spit in the city of Norfolk in South Hampton Roads, and is part of the Hampton Roads Beltway. To ease the traffic pressure, the expansion of the I-64...

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Hollow bar soil nail of Sinorock can meet specific demands

Hollow bar soil nail can be installed in sites with weak rocks, loose soil, weathered layer, sand with stone layer and so difficult to create a hole in complex formation. The unconsolidated ground condition favor the technique of Hollow bar soil nail for fast and simple method of installed compared to the traditional method. For simultaneously drilling and injecting, it is usually performed in cases where the ground needs to be further improved or stabilized during installation. The installation of Hollow bar soil nail is simple and fast, the cost is less, and more important is that the Rock anchor...

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Best suited conditions for soil nailing

In general, the economical use of soil nailing requires, the ground has to be stand unsupported in a vertical or steeply – sloped cut of 1 to 2 m in height for one to two days. In addition, it is highly desirable that an open drill hole can maintain its stability for at least several hours neither the execution of the work would be more challenging. Geologically the best suited conditions for soil nailing would be characterized as the stiff to hard fine-grained soils which include stiff to hard clays, clayey silts, silty clays, sandy clays, and sandy silts are...

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The application and main functions of soil nail wall

Soil nail wall construction is a technique used to bring soil stability in areas where landslides might be a problem. Soil nail can prevent landslides by inserting steel reinforcement bars into the soil and anchoring them to the soil strata. It is called Soil Nail because it’s like having a nail being hammered into the soil, where the nails, are the steel bars. Soil Nail Wall Applications The process of soil nail wall construction has some areas in which is recommended and could provide great benefits, especially when no other option is available. One of the most important things about...

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Sinorock, Your Best Choice Among Soil Nail Suppliers

To be perfect soil nail suppliers, product quality is very important, however, it is not the only thing that soil nail suppliers should focus on. The devil’s in the detail. There are lots of soil nail suppliers,Sinorock is just one of them, while, Sinorock is the one who cares details mostly. Details in service Sinorock provides various communication channels for customers with fast response such as Skype, What’s App and E-mail. Skype, What’s App will be 7*24 online. Emails will be replied in 4h. We adheres to the “one-to-one” service strategy. There will always be a certain representative to serve...

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