摘要
为研究泥岩锚固结构水化失稳机制,基于不同含水率条件下软岩锚固单体力学试验与细观数值模拟,分析水化作用下软岩锚固单体宏细观力学特性。宏观层面,随着含水率的增大,泥岩锚固结构承载能力降低,不同应力水平下饱和含水率锚固单体试样强度降幅达65.04%~70.41%,锚固结构破碎程度提高,破坏模式由“渐进式”向“突变式”转变。细观层面,泥岩颗粒模量与黏结抗拉强度分别降低91.4%和94.2%,砂岩颗粒模量与黏结抗拉强度分别降低84%和65.8%,水化损伤的加剧会削弱颗粒间的黏结强度并改变黏结受力状态,损伤更容易发育扩展,导致锚杆-岩石、岩石-颗粒间的变形约束能力劣化,岩石颗粒的运动变形能力提升;且水化作用会降低锚固结构的储能极限,使得黏结断裂所需外部输入的能量减少,导致锚固结构整体强度减弱。
To investigate the hydration instability mechanism of mudstone anchorage structures,mechanical experiments and micromechanical numerical simulations were performed on anchored soft rock specimens with various moisture contents.Based on the experimental and simulation results,the macroand meso-mechanical properties of anchored soft rock under the hydration effect were analyzed.At the macro scale,as the moisture content increases,the bearing capacity of the mudstone anchorage structure weakens.The strength of the saturated anchored specimen decreases by 65.04%-70.41% under different stress levels.The anchorage structure becomes increasingly fragmented,and the failure mode transitions from being"progressive"to being"abrupt".At the meso scale,the modulus and cohesive tensile strength of mudstone particles drop by 91.4% and 94.2% respectively,while those of sandstone particles fall by 84% and 65.8% respectively.The intensification of hydration damage weakens the cohesive strength between particles and alters the stress state of the bonds,thereby promoting the development and propagation of damage.Consequently,it deteriorates the deformation constraint capacity between the anchor bolt and the rock and between rock particles and enhances the movement and deformation capacity of rock particles.Moreover,hydration lowers the energy storage limit of the anchorage structure,which reduces the external energy input required for bond fracture and further leads to a continuous decrease in the overall strength of the anchorage structure.
作者
荣浩宇
李桂臣
王伟
赵光明
梁东旭
许嘉徽
RONG Haoyu;LI Guichen;WANG Wei;ZHAO Guangming;LIANG Dongxu;XU Jiahui(Key Laboratory of Deep Coal Resource Mining,Ministry of Education,School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsuu210098,China;School of Mining Engineering,Anhui University of Science&Technology,Huainan,Anhui 232001,China;School of Civil Engineering,Xuzhou University of Technology,Xuzhou,Jiangsu 221018,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期601-612,共12页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(U22A20165,12072102,52174089,52304082)。
关键词
泥岩
锚固单体
含水率
水化失稳
宏细观
mudstone
anchored rock
moisture content
hydration instability
macro-and meso-scale
