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为揭示加锚岩体结构面抗剪强度尺寸效应机理，开展了系列尺寸(100～400 mm)加锚结构面室内剪切试验，对比分析结构面锚固前后抗剪强度及锚杆抗剪力的变化规律，研究了锚杆和结构面的变形破坏特征。研究结果表明：(1)结构面锚固前后抗剪强度均呈负尺寸效应，且尺寸效应随着法向应力增加而逐渐减弱；锚杆抗剪力随着结构面尺寸增加呈非线性增加。(2)锚杆呈“S”形变形特征，变形角度、剪切变形量和轴向变形量随着结构面尺寸增加呈非线性增加；结构面受锚杆挤压发生破裂的程度随着结构面尺寸增加而减弱。(3)引用“锚杆作用面积”概念，结构面尺寸较小时，锚杆作用面积超出结构面产生“边缘效应”,导致锚杆未充分发挥抗剪性能；随着结构面尺寸增大，锚杆性能得到充分发挥，锚杆抗剪力先迅速增加后保持稳定。
Abstract：The shear tests were carried out on anchored joints of a series of size(100-400 mm)to reveal the size effect mechanism of shear strength of anchored rock joints. The changes in shear strength before and after joint anchoring and the shear resistance of anchor bolt were compared and analyzed, and the deformation and damage characteristics of anchors and joints were studied. The results show that the rock joint shear strength before and after anchoring exhibits a negative size effect, and this size effect gradually weakens with the increase of normal stress. The shear resistance of rock bolt increases nonlinearly with the increase of joint size. The rock bolt exhibits a "S" shaped deformation feature, and the deformation angle, shear deformation, and axial deformation increase nonlinearly with the increase of joint size. The degree of joint squeezing caused by bolting decreases with the increase of joint size. Introducting the concept of "anchor bolt action area", the action area of the anchor bolt exceeds the joint when the joint size is small, resulting in "edge effect", which leads to the anchor bolt not fully exerting its shear resistance performance. As the rock joint size increases, the performance of the anchor bolt is fully utilized, and the shear resistance of the anchor bolt rapidly increases.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024.04.010
中图分类号:TU45
引用信息:
[1]刘广建,王志成,罗战友,等.加锚岩体结构面抗剪强度尺寸效应试验及机理研究[J].采矿与岩层控制工程学报,2024,6(04):91-101.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.010.
基金信息:
国家自然科学基金资助项目(42107177,42277147);; 浙江省自然科学基金资助项目(LQ20E040002)