双向耦合地震作用下含软弱层岩质边坡锚固界面剪切作用

为研究地震作用下锚固岩质边坡锚杆-砂浆界面和砂浆-岩体界面上的剪切作用,利用FLAC~(3D)软件构建锚固含软弱层岩质边坡数值模型,对水平向和竖向地震波耦合作用下的全长黏结锚杆锚固边坡两锚固界面上的剪切作用进行了深入研究。研究结果表明:两锚固界面上的剪应力分布很不均匀,界面处于弹性变形阶段时,两峰值剪应力紧邻中性点,随锚固界面脱黏破坏的发展,两峰值剪应力不断地向锚杆两端转移;双向耦合地震波较单向和双向未耦合地震波对锚固界面剪应力影响更为显著。考虑双向地震波耦合作用的锚固边坡抗震设计更为合理。研究结果可为边坡锚固抗震设计提供参考。

Shearing action of anchorage interface of rock slope with soft layer under bidirectional coupled earthquake

In order to study the shearing action on the bolt-grout interface and grout-rock interface of anchored rock slope under earthquake, a numerical model of anchored rock slope with weak layer was established by using FLAC3D software. The shearing action on the two interfaces of the slope anchored by full-length bonded bolts under the coupling action of horizontal and vertical seismic waves is thoroughly studied. The results show that the shear stress distribution on the two anchorage interfaces is very uneven. When the interface is in the stage of elastic deformation, the two peak shear stress is close to the neutral point. With the development of the debonding failure of the anchorage interface, the two peak shear stresses are continuously shifted to the two ends of the bolt. Bidirectional coupled seismic waves have especially significant effects on interfacial shear stress than unidirectional and bidirectional uncoupled seismic waves. It is more reasonable to consider the coupling effect of bidirectional seismic wave in the seismic design of anchored slope. The research results can provide reference for seismic design of anchored slope.