How to support high slopes with self drilling anchor bolts?

Time:2021-09-26From:sinorock View:

In geotechnical engineering, the construction of high slopes is challenging for engineers. High slopes generally refer to a slope above 10m and below 100m, or the height of the rock slope is above 15m and below 100m. If the high slope is unstable, it is very prone to catastrophic and sudden natural disasters such as landslides and mudslides. According to different geological conditions and construction conditions, different support forms should be selected. As a new type of anchor bolt, self drilling anchor bolts can effectively solve the problems of difficult drilling caused by complex geological conditions on high slopes, which can ensure project progress and reach the ideal state.
Self drilling anchor bolt is mainly composed of hollow anchor bar, nut, plate, coupler, centralizer and drill bit. The system integrates the functions of drilling, grouting and anchoring together, and the hollow anchor bar can be cut and lengthened according to project requirements, which not only saves labor force and material resources, but also is convenient. It is a more reasonable solution to solve the problem of high slope support encountering complex stratum.

Solution using self drilling anchor bolt for small and medium-sized slopes
For small and medium-sized slopes, it is necessary to connect the bolt heads to ensure bending rigidity. When designing a support plan, we should determine the slope angle of the foundation slope. Under the condition of ensuring the stability of subgrade and reducing the cost, the slope rate method and self drilling anchors are combined for comprehensive design. The design plan can make use of the anchoring force provided by self drilling anchors to effectively reduce the interference to surrounding soil, and can carry out construction in a smaller area and accelerate the construction speed.
Solution using self drilling anchor bolt for super high slopes
For slopes with an elevation of 130m and above, if you use self drilling anchors for construction, you need to cut the slope appropriately, adjust the flatness and cut the slope ratio to 1:1.2. The slope surface needs to use reinforced concrete frame beams, and self drilling anchor rods are drilled at the nodes of frame beams. In order to have good drainage, the slope surface is designed as a PVC porous drainage pipe. The advantage of the design is that the use of self drilling anchors can greatly reduce the number of drilling holes and reduce the loss of prestress, so that it has a strong supporting force.
In the process of high slope support, the treatment cost is expensive and difficult. Compared with traditional steel bars, self drilling anchor rods not only have the characteristics of light weight and high strength, but also provide supporting force after excavation of rock and soil, which can improve the strength of rock and soil, and control rock and soil deformation. Therefore, when treating high slopes, especially high slopes in loose formations, the use of self drilling anchors can greatly reduce the difficulty of treatment, reduce costs and ensure good stability of high slopes.

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