Effects of surface drilling grouting on deformation properties of thin rock stratum above goaf

1st International Global on Renewable Energy and Development

Dongxiao, Xu^1

Shanghai Dahua Surveying and Mapping Co. Ltd., Shanghai

200136, China^1

关键词: Beam on elastic foundation;    Deformation properties;    Grouting parameters;    Influence mechanism;    Mechanical model;    Shear transfer mechanism;    Strata movement;    Surface drilling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/100/1/012096/pdf
DOI  :  10.1088/1755-1315/100/1/012096

来源: IOP

【 摘 要 】

Strata movement of coal mining for surface drilling grouting of overlying loose layers is distinctly different from that of traditional caving mining. In order to calculate strata movement accurately after full-size grouting, based on the shear transfer mechanism along foundation horizontal, a mechanical model of strata movement was established using the theory of Pasternak double-parameter beam on elastic foundation, and the deflection differential equations of rock beam were derived. Then the influence mechanisms of varied grouting parameters were discussed and the results showed that, the maximum deformation change value of roof increase non-obviously with the increasing of elastic modulus ratio, while decrease non-linearly with the grouting thickness. Thus can provide theoretical reference for strata displacement control in the same or similar projects.