本文選題：邊坡工程 + 拉伸破壞��； 參考：《巖石力學(xué)與工程學(xué)報(bào)》2017年S1期

【摘要】：應(yīng)用FLAC~(3D)數(shù)值軟件結(jié)合強(qiáng)度折減法,分別定義2種破壞準(zhǔn)則來(lái)考慮拉伸破壞和不考慮拉伸破壞,并根據(jù)對(duì)比分析原理,模擬2種典型類型的邊坡——均質(zhì)土坡和含有節(jié)理的巖坡在不同的坡高、坡角、節(jié)理傾角情況下的穩(wěn)定性問(wèn)題,以探討是否需要考慮拉伸破壞,以及在何種條件下必須考慮,影響程度如何。模擬結(jié)果顯示,在采用連續(xù)介質(zhì)力學(xué)與理想彈塑性模型來(lái)模擬滑坡問(wèn)題時(shí),是否考慮拉伸破壞對(duì)均質(zhì)土坡穩(wěn)定性影響不大,但對(duì)于模擬節(jié)理巖坡滑動(dòng)的影響不可忽略�？紤]抗拉強(qiáng)度準(zhǔn)則之后,巖土邊坡安全系數(shù)偏于保守。對(duì)于穩(wěn)定性越好的邊坡,進(jìn)行失穩(wěn)分析時(shí),拉伸破壞對(duì)安全系數(shù)的計(jì)算影響越大。同時(shí)在巖質(zhì)邊坡節(jié)理的傾角接近水平和豎直時(shí),只有在考慮拉伸破壞時(shí)才可以更加真實(shí)合理地模擬出邊坡的破壞區(qū)以及剪切滑動(dòng)面。采用定義的2種破壞準(zhǔn)則分析意大利阿勒頗露天礦山滑坡問(wèn)題,驗(yàn)證上述研究結(jié)論。最后,對(duì)數(shù)值模擬方法、本構(gòu)模型、孔隙水壓等對(duì)邊坡穩(wěn)定性模擬分析的影響進(jìn)行討論。
[Abstract]:In this paper, two kinds of failure criteria are defined to consider tensile failure and non-consideration of tensile failure by using FLACU 3D numerical software combined with strength reduction method, and according to the principle of comparative analysis, two kinds of failure criteria are defined to consider tensile failure and not to consider tensile failure. To simulate the stability problems of two typical types of slope-homogeneous soil slope and rock slope with joints at different slope heights, angles, and dip angles of joints, in order to explore whether tensile failure needs to be considered and under what conditions it must be considered, What is the degree of influence? The simulation results show that, when using continuum mechanics and ideal elastic-plastic model to simulate landslide, the effect of tensile failure on stability of homogeneous soil slope is not significant, but the influence of simulating slip of jointed rock slope can not be ignored. Considering the criterion of tensile strength, the safety factor of rock slope is conservative. For the slope with better stability, the influence of tensile failure on the calculation of safety factor is greater. At the same time, when the slope angle of rock slope is close to horizontal and vertical, only when tensile failure is considered can the failure zone and shear sliding surface of rock slope be simulated more realistically and reasonably. The landslide problem of open pit mine in Aleppo, Italy, is analyzed by two damage criteria, and the above conclusions are verified. Finally, the effects of numerical simulation method, constitutive model and pore water pressure on slope stability are discussed.
【作者單位】： 大連理工大學(xué)海岸和近海工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;大連理工大學(xué)土木工程學(xué)院;大連理工大學(xué)巖石破裂與失穩(wěn)研究所;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2014CB047100) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51274053)~~
【分類號(hào)】：TU43

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