Current Application Of Mining Anchor

Current application of mining anchor

The original anchor retaining wall construction is completed and in use for a period of time, because in the planning of the unfavorable elements do not  part, the construction process of the construction of the quality of the construction is not controlled or not in accordance with the construction process of construction, in the process of application because of man-made or natural factors, etc. caused by some of the original anchors fail, and the failure of the anchor can not be approved to rehabilitate its resistance and therefore can not be used normally; so that because of the failure of the anchors Can not continue to supply resistance to bind the deformation of the slope, and other anchor bearing capacity can not be added will result in the anchor anti-slip force is less than the slope sliding force.    

At present, the design method of mining anchor support still stays in the stage of empirical design, and the newly developed on-site monitoring method can help to make further scientific judgment, and it is also developing to the scientific theoretical calculation. Theoretical calculation methods have some problems, and are still generally used only as a design reference basis, but there has been great progress in the last decade or so. The following engineering analogies to empirical means, to test as a means of on-site monitoring method and to calculate as a means of “theoretical analysis method” for a brief introduction.

The engineering analogy method is a widely used method, which directly proposes the design parameters of the anchor spray support based on the experience of similar projects that have been constructed. Usually, the engineering analogy method is based on the anchor spray support type and parameter table in the anchor spray support specification.

Site monitoring design method is a kind of information design construction method according to the principle of Neo method, which is generally divided into two stages: pre-design stage and final design stage. The final design is based on the site monitoring data, after analyzing or calculating the proposed design.

Field monitoring and measurement usually include section convergence measurement, surrounding rock deformation measurement, anchor stress measurement and other items, for section project also need to carry out spray layer surface contact stress and spray layer stress measurement.

Theoretical analysis method is divided into two categories: one is the analytical method, and the other is the numerical calculation method. The following mining anchor manufacturers to anchor suspension theory calculation as an example, to illustrate the essence of the theoretical analysis method.

When the strength calculation of anchor rods supporting individual dangerous rocks is carried out, the connection between the unstable rock mass block and the stable rock mass block needs to be ensured for the locally arranged anchor rods. Usually, the top arch anchors are commonly used in the “suspension theory” calculation, and the anchors on the side arch and side wall should ensure that the dangerous rocks do not slip, and the effect of anchor prestress and the shear strength of the sliding surface and are generally taken into account in the calculation. In general, only the effect of gravity is considered, and the following formula is usually used to determine the spacing of anchors and the depth of anchors into the stabilized rock.