In recent years, the use of self-drilling rock bolts to support soil-rock mixed slopes has become a common method to deal with slope deformation and damage. How does the self-drilling rock bolt support this soil-rock mixed slope? Today, Sinorock will give you a brief introduction.
In the construction of many expressways, many soil-rock mixed slopes need to be supported. What is soil-rock mixed slope? In simple terms, a soil-rock mixed slope is a slope composed of both soil and rock structures. Under the action of external force, the soil-rock mixed slope has various deformation and failure modes due to its structural characteristics, such as water damage and slump caused by rain erosion on the surface and shallower strata, and due to the poor strength of the soil itself. The arc-shaped sliding of the soil caused by the problem, and the overall sliding of the slope soil controlled by the soil-rock structure plane. The diversity of its own deformation and failure modes and the complexity of its influencing factors lead to frequent occurrence of soil-rock mixed slope diseases, which are difficult to cure. It has become an important problem for engineers and technicians in the process of highway construction and operation.
For the soil-rock mixed slope, several problems need to be paid attention to when using self-drilling rock bolts for support.
1. Classification: Due to the various failure modes of the slope, there are problems of shallow slump and arc-like slippage of the middle soil, and the slopes have different problems at different heights and stages. Therefore, it is necessary to use self-drilling rock bolts for anchoring. When using self-drilling rock bolts to support the soil-rock mixed slope, the grading series and the slope ratio of each grade should be determined according to the overall slope and overall length of the slope.
2. The design depth of self-drilling rock bolts should be deep enough: because the shallow layers of soil-rock mixed slopes are mostly soil structures, the drilling depth of the bolts is not enough, and the anchors formed after grouting are still in unstable rock and soil. In the layer, the anchoring effect cannot be achieved. In other words, it is basically equivalent to not anchoring the slope.
3. Set up drainage system during construction: Since the shallow structure of soil-rock mixed slope is seriously affected by rainwater, drainage holes and surface interception and drainage measures should be supplemented during anchoring treatment to prevent rainwater from being drained in time and aggravating The infiltration depth causes the shallow soil to be slippery.
The use of self-drilling rock bolts to support the soil-rock mixed slope requires in-depth analysis of its structural composition. It is necessary to consider the control of the deep slip deformation of the slope, and at the same time to prevent the deformation and damage of the middle and shallow soil. In general, the self-drilling rock bolts for the treatment of soil-rock mixed slopes have good coordination and mutual adaptability between the anchoring structure and the rock and soil due to the anchoring and strengthening effects of the anchoring measures on the rock and soil. It can form a common working system with the slope rock and soil mass, which can realize the purpose of making full use of the strength of the rock and soil mass itself.
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