發(fā)布時間：2018-03-05 20:14

  本文選題：黏彈塑性　切入點：西原模型　出處：《水利水電技術(shù)》2017年04期 　論文類型：期刊論文

【摘要】：為進行流變圍巖圓形隧洞工程應(yīng)力、應(yīng)變分析,將Hoek-Brown強度準(zhǔn)則引入到西原流變本構(gòu)模型,同時在力學(xué)模型中考慮掌子面推進效應(yīng)和支護阻力對圍巖應(yīng)力釋放率的影響,得到了支護條件下基于Hoek-Brown準(zhǔn)則西原模型的圓形隧洞黏彈塑性解。通過錦屏二級水電站引水隧洞案例驗證解析方法的可靠性,并進行了塑性區(qū)半徑和圍巖變形的影響因素定量分析。研究結(jié)果表明:(1)基于Hoek-Brown準(zhǔn)則的西原模型更能反映實際隧洞工程巖體流變特性,建立的解析方法能夠考慮圍巖應(yīng)力釋放效應(yīng)和塑性體積擴容特征對圍巖變形的影響,其計算結(jié)果與實際監(jiān)測數(shù)據(jù)吻合良好;(2)圍巖應(yīng)力釋放系數(shù)、Hoek-Brown準(zhǔn)則參數(shù)s、原巖應(yīng)力和隧洞半徑對塑性區(qū)半徑的影響較大,是判斷流變圍巖隧洞穩(wěn)定性的主要考慮指標(biāo),相對而言,巖石單軸抗壓強度和Hoek-Brown準(zhǔn)則參數(shù)m對塑性區(qū)半徑的影響較小;(3)引入圍巖擴容系數(shù)后,圍巖位移量顯著增加,但基本不影響圍巖流變變形曲線形態(tài)和塑性區(qū)半徑,從洞壁向圍巖內(nèi)部延伸,圍巖擴容系數(shù)對圍巖變形的影響越來越小。
[Abstract]:In order to analyze the stress and strain of rheological surrounding rock circular tunnel engineering, the Hoek-Brown strength criterion is introduced into the western-original rheological constitutive model, and the influence of the propelling effect of face surface and supporting resistance on the stress release rate of surrounding rock is considered in the mechanical model. The viscoelastic-plastic solution of circular tunnel based on the Hoek-Brown criterion is obtained under the support condition. The reliability of the analytical method is verified by the case of the diversion tunnel of Jinping II Hydropower Station. The quantitative analysis of the influencing factors of the radius of plastic zone and the deformation of surrounding rock is carried out. The results show that the Xiyuan model based on Hoek-Brown criterion can better reflect the rheological characteristics of rock mass in actual tunnel engineering. The analytical method can take into account the stress release effect of surrounding rock and the effect of plastic volume expansion on the deformation of surrounding rock. The calculated results are in good agreement with the actual monitoring data.) the stress release coefficient of surrounding rock and the parameter of Hoek-Brown criterion s, the original rock stress and the radius of tunnel have a great influence on the radius of plastic zone, which is the main consideration index to judge the stability of rheological surrounding rock tunnel. The uniaxial compressive strength of rock and the influence of Hoek-Brown criterion parameter m on the radius of plastic zone are small.) when the expansion coefficient of surrounding rock is introduced, the displacement of surrounding rock increases significantly, but it does not affect the shape of rheological deformation curve and the radius of plastic zone. From the wall of the tunnel to the interior of the surrounding rock, the influence of the expansion coefficient of the surrounding rock on the deformation of the surrounding rock is becoming smaller and smaller.
【作者單位】： 中國水利水電科學(xué)研究院流域水循環(huán)模擬與調(diào)控國家重點實驗室;北京交通大學(xué)土木建筑工程學(xué)院;
【基金】：國家重點研發(fā)計劃課題(2016YFC0401801,2016YFC0401804) 中鐵第一勘察設(shè)計院項目基金資助(2014-93-08-01)
【分類號】：TV554

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