SHI Zhan-shan, LIANG Bing, WANG Yan, QIN Bing. Study of Kilometer Drilling Stability at Different Strata Beneath the Floor[J]. Applied Mathematics and Mechanics, 2017, 38(9): 1041-1052. doi: 10.21656/1000-0887.370234
Citation: SHI Zhan-shan, LIANG Bing, WANG Yan, QIN Bing. Study of Kilometer Drilling Stability at Different Strata Beneath the Floor[J]. Applied Mathematics and Mechanics, 2017, 38(9): 1041-1052. doi: 10.21656/1000-0887.370234

Study of Kilometer Drilling Stability at Different Strata Beneath the Floor

doi: 10.21656/1000-0887.370234
Funds:  The National Key Research and Development Project of China(2016YFC0600704;2016YFC0801404)
  • Received Date: 2016-07-25
  • Rev Recd Date: 2017-06-26
  • Publish Date: 2017-09-15
  • The stability of gas drainage drilling affects the quality of extraction engineering. Under the action of mining, underfloor kilometer drillings distributed at different horizons have different loading and unloading paths. To get the influence of mining on borehole stability, the loading and unloading paths of drillings located at different horizons were analyzed and accordingly the hole destruction area and the wall displacement at different loading and unloading rates and timevarying loading and unloading rates were numerically simulated. Through 10 numerical simulation schemes, the distribution of plastic zones and the loading and unloading displacement curves of the hole wall were obtained. Based on the numerically simulated relationship between the unloading rate and the hole deformation hysteresis, the shear stress calculation model around the borehole was built in view of the unloading rate. The results indicate that, during the loading process, the loading rate hardly inflences the destruction area arround the borehole; during the unloading process, the destruction area arround the borehole is related to the initial unloading stress and the unloading rate. The stress and the unloading rate at the hole location shall be synthetically considered in the placing of bedding boreholes.
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