锚固节理岩体力学效应的模型试验和数值模拟研究
首发时间:2013-01-05
摘要:工程岩体是富含节理裂隙的介质。大多数工程岩体都采取锚杆锚固的方式进行加固,以确保施工操作过程中的安全。 然而,节理岩体中锚杆的加固机理,至今仍然并不明确。本文采用类岩石材料制作试件,用内部预置裂隙的方式来模拟节理岩体。进行单轴和双轴压缩试验,对比有锚杆和无锚杆状态下试件的开裂及破坏,以研究锚杆的加固作用,并研究其加固机理。通过对试件破坏过程的研究,以及采用FLAC3D软件对岩体锚固效果的数值模拟,以两者进行对照,结果显示出了一定的规律性。
关键词: 节理岩体 岩石非连续性 室内试验 锚固效应 数值分析
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Physical Testing and Numerical Simulation Study on the Mechanical Effect of Anchored Jointed Rock
Abstract:Engineering rock mass is usually a medium with many joints and fissures. Most engineering rock masses are reinforced by rockbolts in order to ensure the safety during construction and operation. However, the reinforcement mechanism of rockbolts for jointed rock masses is yet unclear till now. In this paper, a rock-like material was adopted to manufacture specimens and an artificial crack was generated to simulate rock joint. Uniaxial and biaxial compression tests were conducted on, fractured specimens and fractured specimens with bolts to simulate the effects of rockbolts. The failure process of specimens were investigated. The effects of rockbolts were also numerically simulated by pile elements in FLAC-3D software. It is shown that the results obtained by two methods are well comparable in terms of regularity.
Keywords: jointed rock;rock discontinuity; laboratory testing; rock bolting; numerical analysis
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