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为研究地震作用下锚固岩体边坡中锚杆-砂浆界面和砂浆-岩体界面的剪切相互作用,揭示锚固界面上相互作用机理,同时获得地震作用下锚固岩体边坡两锚固界面的剪应力分布规律,采用有限差分软件FLAC3D建立锚固岩体边坡数值分析模型,并用interface接触面单元模拟锚杆-砂浆界面和砂浆-岩体界面的剪切相互作用,对简谐地震波作用下锚固边坡中全长黏结锚杆锚固界面剪应力的分布规律进行了研究,研究发现:在地震作用下,砂浆-岩体界面剪应力首先达到其极限黏结强度并出现脱黏现象,剪应力峰值从破坏面向锚杆两端发展;与此同时,锚杆-砂浆界面上的剪应力没有达到其极限黏结强度,但是该界面剪应力峰值会随着砂浆-岩体界面的脱黏而进行相应的调整;砂浆-岩体界面脱黏后,锚杆轴力呈两翼外凸的人字形曲线分布,轴力曲线拐点与界面剪应力曲线峰值点相对应,脱黏区域锚固体均匀拉伸,轴力分布均匀.该研究可为相关模型试验、现场监测、设计施工研究提供参考.
In order to study the shear interaction between the anchor-mortar interface and the mortar-rock interface in an anchored rock mass slope under seismic action, the interaction mechanism of the anchor interface is revealed and the two anchorage interfaces The finite element software FLAC3D is used to establish the numerical analysis model of anchored rock mass slope. The shear interaction between the anchor-mortar interface and mortar-rock interface is modeled by the interface interface element, The distribution of shear stress at the anchoring interface of full-length cohesive anchor in slope is studied. It is found that under the action of earthquake, shear stress of mortar-rock interface firstly reaches its ultimate bond strength and debonding occurs, and the peak value of shear stress At the same time, the shear stress on the anchor-mortar interface does not reach the ultimate bond strength, but the peak shear stress of the interface will be adjusted accordingly as the mortar-rock interface debonds After the mortar-rock interface is debonded, the axial force of the anchor rod has a convex herringbone curve distribution on both wings, and the inflection point of the axial force curve corresponds to the peak point of the interfacial shear stress curve Anchor region stretched uniformly, a uniform distribution of axial force. This may be related to study model tests, field monitoring, study design construction reference.