A method for calculating the effective anchorage length of a non-prestressed anchor cable of a rock slope

Abstract

The invention discloses a method for calculating the effective anchoring length of a non-prestressed anchor cable of a rock slope. Firstly, a rock mass failure body model around a non-prestressed anchor cable grouting body is established. The velocity field around the grouted rock mass is established, and the energy loss and external force power in the slip plane are deduced. According to the reciprocal theorem of internal and external work, the calculation formula of the maximum pulling force that the anchor cable can bear is deduced. The stress distribution of rock failure surface element isestablished, and the maximum drawing force formula of anchor cable is deduced according to the equilibrium condition of the force. Combined with the formula of maximum drawing force deduced above, the formula of effective anchorage length of anchor cable is deduced. This method can be applied to complex and changeable rock geological conditions with uncertain engineering conditions. Based on theplastic mechanics limit analysis method, the mechanical model is established, and the load distribution law of rock mass around the anchor rod is obtained. The effective anchorage length of the anchorrod is deduced through the solution of the ultimate pullout force of the system anchor rod and the design is carried out.

Description

technical field [0001] The invention relates to a calculation method for the effective anchorage length of rock slope anchor cables, in particular to a calculation method for the effective anchorage length of non-prestressed anchor cables for rock slopes. Background technique [0002] At present, anchor cable support has become the first choice in the foundation pit support scheme in my country. In the face of this phenomenon, domestic and foreign researchers have conducted a large amount of qualitative or quantitative analysis on the theoretical research of this technology, such as indoor experiments, outdoor experiments, and theoretical discussions. However, the research and discussion on the anchor cable mechanism, as well as the doubts and debates, have never ceased. The domestic and foreign counterparts not only have not reached a consensus, but also have very different understandings. Many engineering technologies still rely on unified code requirements or engineering...

AI Technical Summary

Problems solved by technology

Many engineering technologies still rely on unified code requirements or engineering experience for design or construction, lacking theoretical basis. At the same time, due to the complex and changeable nature of the rock mass in each region, the formation background of each stratum in each region is different, and the geological structure history of each region is also different. These are not the same, and these all endow the anchor cable support with different mechanical properties. Facing such an environment with complex stress and large differences in the properties of some materials, it is difficult to understand the anchoring mechanism of the anchor cable support system. for accurate analysis

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