The Application Of Prestressed Anchorage Technoogy In Mine Slope Support

Since the advent of prestressed anchorage technology, it has become one of the most economic and effective way to improve the stability of geotechnical engineering and to solve the problem of geotechnical engineering complex and difficult,because of the characteristics of simple and reasonable construction process, save the engineering cost, construction safety and fast. With the development of the prestressed geotechnical anchoring technology is becoming more perfect in our country, prestressed anchor technology has been widely used in the construction of large project, and achieved good supporting effect.The prestressed anchor cable (rod) support system strengthening high slope, is the common method of application of geotechnical anchoring technology in high slope engineering. It use the shear strength of the rock and soil around the anchor rope (rod) to transfer structure tension or maintain the stability of the surface of excavation.Due to the use of anchor cable (rod), the anchor produce a compression stress zone and it has the effect of the reinforcement to tratum reinforcement; it can enhance the The strength of the formation, improve mechanical properties of the formation; it can make the structure and chain of formation together, forming a complex of joint work, so that it can under tension and shear effectively, and can improve the shear strength of the potential slip surface, effectively prevent the slope displacement and failure, thus ensuring the stability and safety of side slope. According to the type of slope and the possible failure modes, slope stability calculation method divided into circular sliding method and the sliding method, etc.. The fractured rock slope stability of soil slope or a larger scale weathering strongly should be calculated with the stability of rock slope weathering degree arc sliding method, a strong or not strong should be calculated with plane sliding method, for the complex geological conditions, the same side slope slope stability with different rock mass should be calculated with sliding method.Prestressed anchor cable (rod) support system for anchorage support of rock and soil mass basically dominated by tensile type.This system is widely used in rock slope, soil slope, foundation pit and anchorage foundation and supporting work. Cable (rod) as a new type of tension member, is mainly due to bolt with pullout force in the rock soil, when the anchor rod body is forced, the stress transfer to the mortar through the cable (rod) and the surrounding cement mortar bond (bond) first, and then transfer to the surrounding soil through the mortar. With the increase of the load in transfer process, cable (rod) and cement mortar bond (bond) develop gradually to the bolt end When the anchorage section play to the maximum cohesive force, there will be the relative displacement of soil, then friction between rock and bolt, until the limit friction resistance. The bearing capacity of anchor rope (rod), that is the ultimate pullout force, according to the transfer mode of the anchor bolt tension, usually the bearing capacity of anchor depends on the following factors:ultimate tensile strength of cable (rod) materials; the ultimate bond strength between cable (rod) and anchorage (bond); ultimate lateral resistance between soil anchor and the solid rock. Because the ultimate bond(bond) strength between cable (rod) and anchorage is far greater than the ultimate side resistance between the anchor and soil and rock solid, the bearing capacity of the anchor rope (rod) depends mainly on the latter, namely the ultimate side resistance of rock and mortar.Through the specific engineering example, This article is presented the specific implementation methods and means that used for supporting treatment high slope in engineering construction from the aspects of slope geological survey stage, the supporting design stage of stability analysis and calculation as well as construction stage of support management etc, that happened befor implementation of large slope supporting engineering investigation phase..And highlight for prestressed anchor cable (rod) support system of rock and soil anchor support play a important role in slope supporting governance.And highlight for the important role that prestressed anchor cable (rod) support system of rock and soil anchor support played in slope supporting governance.