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<p>The mudstone-clay composite roof roadway exhibits distinct transversely isotropic characteristics, rendering the prediction of uncoordinated deformation in surrounding rock complex and challenging. Based on transversely isotropic theory, the deformation parameters of mudstone-clay composite in different directions are calculated by true triaxial experiment, and the elastic modulus is determined as the key parameter affecting the uncoordinated deformation of composite roof roadway. The stress and strain expression of roadway surrounding rock is theoretically deduced, and the utilization of ultra-high strength bolts is proposed to control the uncoordinated roadway deformation. The results indicate significant variations in the elastic modulus of the mudstone-clay assemblage in both horizontal and vertical directions, with Poisson’s ratio showing a narrow range of variation. The composite with saturated clay exhibits reduced deformation resistance and more pronounced transverse isotropy compared to the composite with dry clay. The stress concentration is highest near the inflection point of the roadway. The roadway ribs experience vertical stress increase and horizontal stress decrease, while the roof and floor strata mainly undergo vertical stress decrease and horizontal stress increase. The strain in roadway surrounding rock mainly shows vertical strain, especially with the roadway roof exhibiting the highest vertical strain peak and the largest influence range. The vertical strain of roadway surrounding rock can be significantly reduced by increasing the value of its vertical elastic modulus <i>E</i><sub>2</sub>, if it is less than 0.15GPa. However, value higher than this has little effect on the strain. According to the field observation, the utilization of ultra-high strength bolt support (<i>E</i><sub>2</sub> &gt; 0.15GPa) in comparison to Q<sub>235</sub> threaded steel resin bolt support (<i>E</i><sub>2</sub> &lt; 0.15GPa) demonstrates a significant reduction in roadway uncoordinated deformation, thereby validating the accuracy of theoretical research.</p>

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Stress–strain response and deformation control method of a roof roadway in transversely isotropic mudstone-clay strata

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Huaidong Liu,
  • Changyou Liu,
  • Jingxuan Yang,
  • Jun Wang

摘要

The mudstone-clay composite roof roadway exhibits distinct transversely isotropic characteristics, rendering the prediction of uncoordinated deformation in surrounding rock complex and challenging. Based on transversely isotropic theory, the deformation parameters of mudstone-clay composite in different directions are calculated by true triaxial experiment, and the elastic modulus is determined as the key parameter affecting the uncoordinated deformation of composite roof roadway. The stress and strain expression of roadway surrounding rock is theoretically deduced, and the utilization of ultra-high strength bolts is proposed to control the uncoordinated roadway deformation. The results indicate significant variations in the elastic modulus of the mudstone-clay assemblage in both horizontal and vertical directions, with Poisson’s ratio showing a narrow range of variation. The composite with saturated clay exhibits reduced deformation resistance and more pronounced transverse isotropy compared to the composite with dry clay. The stress concentration is highest near the inflection point of the roadway. The roadway ribs experience vertical stress increase and horizontal stress decrease, while the roof and floor strata mainly undergo vertical stress decrease and horizontal stress increase. The strain in roadway surrounding rock mainly shows vertical strain, especially with the roadway roof exhibiting the highest vertical strain peak and the largest influence range. The vertical strain of roadway surrounding rock can be significantly reduced by increasing the value of its vertical elastic modulus E2, if it is less than 0.15GPa. However, value higher than this has little effect on the strain. According to the field observation, the utilization of ultra-high strength bolt support (E2 > 0.15GPa) in comparison to Q235 threaded steel resin bolt support (E2 < 0.15GPa) demonstrates a significant reduction in roadway uncoordinated deformation, thereby validating the accuracy of theoretical research.