Experimental study on multi-source information response of force，electromagnetics and acoustics in the whole process of deformation and fracture evolution of structural surrounding rock
Abstract：In order to study the multi-source information response of force，electromagnetics and acoustics in the whole process of deformation and fracture evolution of structural surrounding rock，and to explore the internal relation between deformation evolution process and surrounding rock disaster under the interaction between the rock-base block and the structural interface，the mining coal roadway of a coal mine in Shandong was used as engineering background to conduct the study. The large-scale physical model tests on the structural surrounding rocks under different support strengths were carried out to investigate their whole loading processes by relying the self-developed roadway surrounding rock model test system，combined with multi-source information monitoring such as internal stress，surface displacement，electromagnetic radiation，resistivity，ultrasonic，borehole peeping internal cracks and 3D tomography. The results show that the surrounding rock without support presents brittle failure characteristics relating to the shear slip of the structural plane during the bearing process. In contrast，the bolt and cable support has greatly strengthened the peak strength and peak strain of the model by restraining the shear slip of structural plane and the displacement deflection of structure，with a difference of nearly one time in value，and effectively weakened the stress drop before the peak of the model. The internal stress of the structural surrounding rock without support directly decays with loading，and its displacement field has obvious block structure deformation characteristics. While the supported structural surrounding rock shows more obvious pressure arch effect，and the block structure deformation characteristics gradually weaken with the increase of support strength. Compared with the structure without support，the electromagnetic radiation intensity of the surrounding rock of the supporting structure is higher，and the electromagnetic radiation pulse fluctuation is more significant. This is due to the transformation of the shear slip of rock foundation along the structural plane under the condition without support to the crushing deformation of anchored rock foundation block under the condition with support，which restrains the large structural deformation induced by the sliding of block rock foundation along the structural plane. By using the apparent resistivity to quantitatively evaluate the damage degree of the surrounding rock，the high resistance area of the structural surrounding rock without support accounts for 18.46% of the model，while that with bolt and cable support only accounts for 9.94% of the model，which is basically consistent with the loose circle of surrounding rock obtained from ultrasonic velocity feedback. With the increase of support strength，the crack development of surrounding rock and the roof delamination significantly decreases. Its instability and failure are attributed to the deterioration of surface protection of the shallow anchoring structure and the dislocation and slip of the deep structure.
靖洪文，吴疆宇，尹 乾，孟 波，邹凤祥. 结构体围岩变形破裂演化全过程力电磁声多源信息响应试验研究[J]. 岩石力学与工程学报, 2023, 42(7): 1582-1598.
JING Hongwen，WU Jiangyu，YIN Qian，MENG Bo，ZOU Fengxiang. Experimental study on multi-source information response of force，electromagnetics and acoustics in the whole process of deformation and fracture evolution of structural surrounding rock. , 2023, 42(7): 1582-1598.
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2023, Vol. 42 
