The anchor is a rod-like structure anchored in the rock body to maintain the stability of the surrounding rock. For the surrounding rock of the underground engineering, the anchor rod is used as the main component of the support system, and the bolt support system is formed. The single anch…

1. The goal of roof control

From the current technical level, there are three reasonable roof control targets for the single hydraulic strut working face: firstly, it can eliminate the hidden dangers of pressure, leakage and pushing top to minimize the occurrence of various types of…

The treatment and monitoring of open pit slopes is an important part of mine slope research and daily slope management. It generally includes the treatment of surface water and groundwater, controlled blasting, artificial reinforcement of slopes, and possible and existing slope displacement…

It is a kind of bottom column caving method and has the common feature of the bottom column caving method. The stage caving method is to recover at the full height of…

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1. Vertical well construction and excavation work

(1) General construction method of well back plate

The circle spacing of the well ring is generally 1.0m. When encountering a soft section, first dig the section to retain the annular step, and then dig up the full section, a…

This standard specifies the ability, responsibility, authority, and operating procedures for concentrate filtration and other job operations.

2. area

This standard is applicable to the personnel who are discharging, fi…

According to Australian media reports on September 10, although in the Australian market, Chinese-made cars, sport utility vehicles (SUVs) and light commercial vehicles are still relatively small brands, but after a few ye…