Research and experiment on complex strata detection for Luanchuan molybdenum mine in Henan province

CHEN Yong and WEI Zhaojie; ${author.authorNameEn}

doi:10.12143/j.ztgc.2021.10.009

2021 Vol. 48, No. 10

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CHEN Yong and WEI Zhaojie, . 2021. Research and experiment on complex strata detection for Luanchuan molybdenum mine in Henan province. DRILLING ENGINEERING, 48(10): 70-75. doi: 10.12143/j.ztgc.2021.10.009

Citation:

CHEN Yong and WEI Zhaojie, . 2021. Research and experiment on complex strata detection for Luanchuan molybdenum mine in Henan province. DRILLING ENGINEERING, 48(10): 70-75. doi: 10.12143/j.ztgc.2021.10.009

Research and experiment on complex strata detection for Luanchuan molybdenum mine in Henan province

CHEN Yong and WEI Zhaojie¹,
²

1. Eleventh Geological Brigade, Xinjiang Bureau of Geo‑exploration & Mineral Development,Changji Xinjiang 831100, China;
2. College of Construction Engineering, Jilin University, Changchun Jilin 130026, China

Received Date: 08 March 2021

Revised Date: 26 August 2021

Abstract

Abstract

The multilayer goafs and a large number of accumulated tailing strata in Luanchuan molybdenum mine in Luoyang lead to hole wall failure during drilling， which is generally exhibited as collapse， block falling； meanwhile， the detection equipment can not be lowered to the bottom of the hole and the construction period is delayed. In view of this situation， this paper summarizes two new exploration techniques：（1） A new process of strengthening the hole wall with loess is adopted during drilling， by which loess forms a protective layer on the hole wall through compaction. （2） a new type of tapered bit is designed， which can be stricken down to the bottom of the goaf with a heavy hammer； thus， the borehole television and other detection equipment can be run down hole with protection of the central hollow drill string. Field use has proven that the techniques are feasible by repeated field practice， and the hole wall remained stable and no longer appeared unstable with progress of the construction period， providing guarantee for the subsequent geological exploration of goafs. They have ensured the smooth implementation of the operations economically and safely， and also provide reference for the exploration of complex strata in the future.
- multilayer goaf /
- accumulated tailing strata /
- instability of hole wall /
- loess reinforcement hole wall /
- tapered bit /
- strike the drill bit by heave hammer

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References

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