Preprint Article Version 1 This version is not peer-reviewed

Analysis of Shear Failure of Surface Methane Capture Boreholes for Improving Efficient Drainage Period–A Lithology Perspective

Version 1 : Received: 1 July 2019 / Approved: 2 July 2019 / Online: 2 July 2019 (11:52:10 CEST)

How to cite: Xu, H.; Fang, Z.; Sang, S.; Yang, J.; Liu, H.; Ding, H.; Dou, X. Analysis of Shear Failure of Surface Methane Capture Boreholes for Improving Efficient Drainage Period–A Lithology Perspective. Preprints 2019, 2019070045 (doi: 10.20944/preprints201907.0045.v1). Xu, H.; Fang, Z.; Sang, S.; Yang, J.; Liu, H.; Ding, H.; Dou, X. Analysis of Shear Failure of Surface Methane Capture Boreholes for Improving Efficient Drainage Period–A Lithology Perspective. Preprints 2019, 2019070045 (doi: 10.20944/preprints201907.0045.v1).

Abstract

The shear failure of surface methane capture borehole (SMCB) is the main cause of shortening life cycle of SMCB but lack of lithological analysis. In order to improve the stability of SMCB and improve efficient drainage period, it is of great significance to investigate the lithology performances for shear failure of SMCB. Based on the direct shear tests and geological method, the results shows that the shear displacement increases as the grain size decreases. Mechanical jump occurs at the lithological boundaries, which is mainly determined by the composition of rock specimens. The cohesion is the mainly possible reason for the step change of shear strength. Lithology with high quartz and low clay may effectively improve shear strength and failure resistance. Boreholes drilled into the weaker siltstone and mudstone sections may potentially experience preferential damage due to the larger shear displacement and shear strength. Protective measures at these sections may improve the stability of the borehole casing. The probing data where it was found that boreholes closure validated the prediction.

Subject Areas

Lithology performance; shear failure; surface methane capture borehole; shear strength

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