摘要
为研究结构体围岩变形破裂演化全过程力电磁声多源信息响应,探索岩基块体和结构界面相互作用下围岩变形演化过程与围岩灾害的内在关联,以山东某煤矿一采区掘进煤巷为工程背景,依托自主研制的巷道围岩模型试验系统,结合内部应力、表面位移、电磁辐射、电阻率、超声波、钻孔窥视内部裂隙、三维层析成像等多源信息监测,开展不同支护强度下结构体围岩承载全过程的大尺度物理模型试验研究。结果表明:无支护结构体围岩承载过程中表现出与结构面剪切滑移高度相关的脆性破坏特征。相比之下,锚杆索支护抑制结构面剪切滑移、结构体位错偏转大大强化了模型的峰值强度与峰值应变,数值相差近1倍,并有效弱化了模型峰前的应力跌落。无支护结构体围岩存在内部应力随加载时间直接衰减的情况,其位移场具有明显的块体结构变形特征,而支护结构体围岩表现出更明显的压力拱效应,且块体结构变形特征随着支护强度的提高逐渐弱化。与无支护相比,支护结构体围岩的电磁辐射强度数值更高、电磁辐射脉冲波动更显著,这是由于锚固作用导致无支护条件下岩基沿结构面剪切滑移向支护条件下锚固岩基块体碎胀变形转变,抑制了块体岩基沿结构面滑移诱导的结构大变形。采用视电阻率量化评估围岩的破坏程度,无支护结构体围岩的高阻区面积占模型的18.46%,而锚杆索支护结构体围岩的高阻区面积仅占模型的9.94%,与由超声波速反馈得到围岩松动圈基本一致。随着支护强度的增大,围岩内部裂隙发育与顶板离层量明显减小,其失稳破坏归结于浅部锚固结构失去护表作用、深部结构体出现错动滑移。
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 t
作者
靖洪文
吴疆宇
尹乾
孟波
邹凤祥
JING Hongwen;WU Jiangyu;YIN Qian;MENG Bo;ZOU Fengxiang(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2023年第7期1582-1598,共17页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51734009,52074259,52004272)。
关键词
岩石力学
结构体围岩
锚杆索支护
变形破坏
多源信息
承载能力
rock mechanics
structural surrounding rock
rockbolt and cable support
deformation failure
multisource information
carrying capacity
