Downward slicing advancing filling body strength testing method
An approach filling and field testing technology, applied in the direction of applying stable tension/pressure to test the strength of materials, sampling devices, etc., can solve the problems of uneven structure of the filling body, potential safety hazards, and reduce the strength of the cemented filling body, etc., to avoid Mining accidents, the effect of improving reliability
Active Publication Date: 2017-10-27
JINCHUAN GROUP LIMITED +1
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Problems solved by technology
Since the filling slurry ratio, mixing and transportation process are affected by many human and engineering factors, there are many uncertain factors in the material ratio, slurry mixing and pipeline transportation, which not only reduces the strength of the cemented filling body, but also leads to the failure of the filling body. structural inhomogeneity
This brings safety hazards to mining operations under the filling body
Method used
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[0038] In order to illustrate the on-site test method for the strength of the filling body in the downward layered approach, the implementation steps and evaluation results of the invention will be further described below in conjunction with the technical parameters of filling and mining in Jinchuan Mine.
[0039] Step 1: On-site sampling design of access filling body.
[0040] The specific implementation is as follows:
[0041] (1) Aiming at Jinchuan's down-layered approach-type filling method, the mining process of "one mining at a time" ( figure 1 ), three days after the filling body was filled, the two sides of the access filling body exposed during the two-step return to the mining pillar were sampled by concrete core samplers respectively.
[0042] According to the size of the filling body in the route (length x height = 50m x 5m), the sampling points of the filling body are laid out. Such as figure 2As shown, the sampling sections are arranged at intervals of 10 m i...
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The invention discloses a downward slicing advancing filling body strength testing method comprising the steps: performing sampling design and sampling water samples in a the side of a filling body exposed from a two-step stoping jamb; according to the strength of a circular cylinder test block obtained by field sampling, establishing the relationship between the circular cylinder test block and a cube test block by a laboratory experiment to obtain the strength of a slicing filling body cube; comparing the strength of the advancing filling body cube and the design strength of the filling body to obtain a strength safety index of the field filling body; and finally, according to the safety indexes of the strength of the filling body at multiple sampling positions on two sides of the filling body, drawing a safety index isoline of the whole filling body advancing, evaluating the stability of the advancing filling body and predicting risks of catastrophe and unstability of the filling body. The method can be used for providing a strength testing and safety evaluation technology for safe mining under the top of the filling body so as to improve safety production and risk prediction ability during mining by using a downward advancing filling body method.
Description
technical field [0001] The invention belongs to the technical field of filling and mining, and in particular relates to a method for on-site testing of the strength of a cemented filling body in a downward layered approach. Background technique [0002] The filling method mining is to backfill waste residues, waste rocks, tailings, waste water and other wastes into the underground stope, which can control the stope pressure and surface subsidence; at the same time, it can also reduce waste discharge and protect the environment. Therefore, filling mining is the only way for green mining and the development direction of future resource development and utilization. The downward layering approach filling mining method is mainly used for the mining of ore bodies with unstable ore rock conditions, and the mining operation is performed under the roof of the artificial filling body formed by the cemented filling approach. Therefore, the strength and stability of the access filling ...
Claims
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Login to View More IPC IPC(8): G01N3/08G01N1/08
Inventor 高谦杨志强杨晓炳肖柏林李立涛张鹏董越何建元
Owner JINCHUAN GROUP LIMITED