岩体流变是隧道锚长期稳定性研究重点之一。以FLAC3D软件中CVISC流变模型为理论基础,通过单轴压缩流变试验及接触面长期抗剪强度试验获得与岩体流变相关的力学参数,并将CVISC模型和获得的参数融入依托工程数值仿真模型,进行长期稳定性分析。分析结果显示隧道锚在1倍设计主缆力施加后100a内,锚塞体、围岩及锚塞体与围岩接触面长期变形小,较符合工程设计安全要求。上述研究思路与结果可为类似工程研究提供参考及借鉴。
Abstract
Rock rheology is a focus in analysing long-term stability of tunnel anchor. By uniaxial compression creep tests and long-term contact surface shear strength tests, we obtained rock rheological parameters. These parameters together with CVISC model in FLAC3D were integrated in the numerical simulation model of an engineering example. Results showed that in 100 years after the design, main cable force of tunnel anchor doubles, the anchor plug body, surrounding rock, and the contact surface between rock anchor plug body and surrounding rock has small long-term deformation, which meets the project’s design safety requirements. This research could be a reference for similar engineering studies.
关键词
隧道锚 /
长期稳定性 /
单轴压缩流变 /
接触面长期抗剪强度 /
锚塞体
Key words
tunnel anchor /
long-term stability /
uniaxial compression rheology /
long-term shear strength of contact surface /
anchor plug
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基金
中国电力建设集团有限公司科技项目(SD2013-14)
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