【摘要】：圍巖的穩(wěn)定是地下工程支護(hù)結(jié)構(gòu)穩(wěn)定的關(guān)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(dòng)影響的Hoek-Brown準(zhǔn)則作為巖體力學(xué)參數(shù)的估算方法,并基于隧道圍巖次生應(yīng)力分布及其松動(dòng)失穩(wěn)機(jī)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(qiáng)度折減法與失穩(wěn)判據(jù)相結(jié)合,建立了圍巖自支護(hù)結(jié)構(gòu)穩(wěn)定的安全系數(shù)分析方法;最后,通過采用正交試驗(yàn)設(shè)計(jì),并采用FLAC軟件,對影響隧道圍巖結(jié)構(gòu)穩(wěn)定安全系數(shù)的基本因素進(jìn)行了敏感性分析。計(jì)算結(jié)果表明,地質(zhì)強(qiáng)度指標(biāo)起到關(guān)鍵控制作用,其余依次是開挖擾動(dòng)因子、巖塊單軸抗壓強(qiáng)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(xué)巖土工程研究所;
【基金】：國家自然科學(xué)基金項(xiàng)目(51078136) 深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(SK LGDUEK0915)
【分類號】：U451.2

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本文編號：2172874