【摘要】：圍巖的穩(wěn)定是地下工程支護結(jié)構穩(wěn)定的關鍵,本文圍繞圍巖穩(wěn)定性分析開展了一系列研究。首先針對地下工程圍巖的地質(zhì)歷史特征,使用能夠反映開挖擾動影響的Hoek-Brown準則作為巖體力學參數(shù)的估算方法,并基于隧道圍巖次生應力分布及其松動失穩(wěn)機制,提出了基于隧道拱頂下沉變形位移突變的圍巖失穩(wěn)判據(jù);然后,通過將強度折減法與失穩(wěn)判據(jù)相結(jié)合,建立了圍巖自支護結(jié)構穩(wěn)定的安全系數(shù)分析方法;最后,通過采用正交試驗設計,并采用FLAC軟件,對影響隧道圍巖結(jié)構穩(wěn)定安全系數(shù)的基本因素進行了敏感性分析。計算結(jié)果表明,地質(zhì)強度指標起到關鍵控制作用,其余依次是開挖擾動因子、巖塊單軸抗壓強度、隧道埋深及跨度。
[Abstract]:The stability of surrounding rock is the key to the stability of support structure in underground engineering. Firstly, according to the geological and historical characteristics of surrounding rock of underground engineering, the Hoek-Brown criterion, which can reflect the influence of excavation disturbance, is used as the estimation method of rock mass mechanics parameters, and based on the distribution of secondary stress and the mechanism of loosening and instability of tunnel surrounding rock. Based on the sudden change of deformation displacement of tunnel arch roof, the failure criterion of surrounding rock is put forward, and then, by combining the strength reduction method with the criterion of instability, the safety factor analysis method for the stability of surrounding rock self-supporting structure is established. By using orthogonal test design and FLAC software, the sensitivity analysis of the basic factors affecting the stability and safety factor of surrounding rock structure is carried out. The calculation results show that the geological strength index plays a key role in controlling, and the others are the excavation disturbance factor, the uniaxial compressive strength of the rock block, the buried depth and the span of the tunnel.
【作者單位】： 湖南大學巖土工程研究所;
【基金】：國家自然科學基金項目(51078136) 深部巖土力學與地下工程國家重點實驗室開放基金項目(SK LGDUEK0915)
【分類號】：U451.2

【參考文獻】

相關期刊論文 前9條

1 張永興;胡居義;何青云;王桂林;;基于強度折減法小凈距隧道合理凈距的研究[J];水文地質(zhì)工程地質(zhì);2006年03期

2 譚代明;漆泰岳;莫陽春;;考慮時空效應的軟弱圍巖隧道施工穩(wěn)定性研究[J];水文地質(zhì)工程地質(zhì);2009年04期

3 陳星;李建林;;基于ADINA、ANSYS、FLAC的強度折減法[J];水文地質(zhì)工程地質(zhì);2010年03期

4 吳夢軍;張永興;劉新榮;李p樛，

本文編號：2172874