Method for forming ultra-deep anchor hole in loose accumulation body and breakage rock layer

Abstract

The invention relates to a method for forming an ultra-deep anchor hole in a loose accumulation body and a breakage rock layer. The method comprises the following steps of: 1, selecting hole forming equipment; 2, preparing before drilling; 3, guiding a hole; and 4, drilling to form the hole. The method has the advantages that: difficulty in drilling to form the hole under various complicated conditions is overcome, namely 1, a treatment method after drilling stuck; 2, a treatment method in case of boulder; and 3, an operation method under the condition of abundant underground water. According to practical conditions in projects such as treatment for a third landslide of Yangchun New Steel Co., Ltd, a manual unloading slot of Yangchun New Steel Co., Ltd and deep foundation pit bracing of a dual-roll-over system, the average elapsed time of each drilling hole per meter is shortened by about 0.28 hour, the average loss of each drilling hole per meter is reduced by 20 yuan, and the average consumed working hour of each drilling hole per meter is reduced by about 2.06 hours.

Description

technical field [0001] The invention relates to the field of engineering technology, in particular to a method for forming holes with ultra-deep anchor cables in loose deposits and broken rock-soil layers. Background technique [0002] The main influencing factors of drilling efficiency are: hole depth, physical and mechanical properties of formation, and groundwater. The main difficulty in the process of drilling into holes is: the drill pipe passes through the interface of two different strata, the physical and mechanical properties and geological characteristics of different strata are quite different, and the drill pipe enters the other stratum from one stratum During the drilling process, the drilling pressure of the drill pipe, the feeding air pressure, and the drilling pressure of the follower pipe will all change to varying degrees. If the control is not good, accidents such as drill sticking and bit breakage will occur, which will seriously affect the drilling effi...

AI Technical Summary

Problems solved by technology

The main difficulty in the process of drilling into holes is: the drill pipe passes through the interface of two different strata, the physical and mechanical properties and geological characteristics of different strata are quite different, and the drill pipe enters the other stratum from one stratum During the drilling process, the drilling pressure of the drill pipe, the feeding air pressure, and the drilling pressure of the pipe will change to varying degrees. If the control is not good, accidents such as drill sticking and bit breakage will occur, which will seriously affect the drilling efficiency.