【摘要】：為了揭示深部隧道工程圍巖的分層斷裂機理而展開數(shù)值實驗研究.分析了深部地層巖體歷史及賦存環(huán)境,認(rèn)為深部巖體在力學(xué)上處于峰后階段,根據(jù)巖石峰后應(yīng)力-應(yīng)變特征選定了圍巖的峰后特征指標(biāo)及其開挖響應(yīng)方程.建立了數(shù)值實驗?zāi)Ｐ?設(shè)計了開挖數(shù)值模擬的圍巖響應(yīng)監(jiān)控方案.完成了大量的開挖數(shù)值模擬,實現(xiàn)了深部圍巖分層斷裂現(xiàn)象在數(shù)值模擬中的重現(xiàn).基于實驗中圍巖應(yīng)力、變形分布的全程監(jiān)測結(jié)果,在確定圍巖分層斷裂產(chǎn)生條件的基礎(chǔ)上,進一步研究得到了圍巖分層斷裂層數(shù)、分層斷裂圈半徑、最大峰值應(yīng)力等參數(shù)與峰后特征指標(biāo)的關(guān)系.根據(jù)地下結(jié)構(gòu)開挖圍巖應(yīng)力重分布及巖石力學(xué)破裂機理,分析了分層斷裂中次生自由面、多重似開挖面形成的力學(xué)機制.所得數(shù)值模擬結(jié)果,為深部工程圍巖的分層斷裂提供了驗證依據(jù),消解了長期以來數(shù)值模擬中沒有觀察到分層斷裂現(xiàn)象的困惑.
[Abstract]:In order to reveal the stratified fracture mechanism of surrounding rock in deep tunnel engineering, numerical experiments were carried out. The history and occurrence environment of deep rock mass are analyzed. It is considered that the deep rock mass is in the post-peak stage in mechanics. According to the post-peak stress-strain characteristics of rock, the post-peak characteristic index and the excavation response equation of surrounding rock are selected. The numerical experimental model is established and the monitoring scheme of surrounding rock response is designed. A large number of numerical simulation of excavation has been completed, and the phenomenon of stratified fracture of deep surrounding rock has been reproduced in the numerical simulation. Based on the monitoring results of the stress and deformation distribution of surrounding rock in the experiment, and on the basis of determining the conditions for the formation of stratified fracture of surrounding rock, the number of stratified fracture layers and the radius of the stratified fracture circle of surrounding rock are further studied. The relationship between the parameters such as the maximum peak stress and the characteristic index after the peak. Based on the stress redistribution of the surrounding rock in underground structure excavation and the mechanism of rock mechanics fracture, the mechanism of forming secondary free surface and multiple excavation surface in stratified fracture is analyzed. The obtained numerical simulation results provide a basis for verification of the stratified fracture of surrounding rock in deep engineering and resolve the puzzlement of stratified fracture which has not been observed in the numerical simulation for a long time.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;長沙理工大學(xué)土木與建筑學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51378195,51078136) 深部巖土力學(xué)與地下工程國家重點實驗室資助項目(SKLGDUEK0915)
【分類號】：U451.2

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