【摘要】：為研究巖石蠕變損傷過(guò)程與圍巖塑性區(qū)擴(kuò)展之間的內(nèi)在聯(lián)系,建立基于塑性擴(kuò)張的變參數(shù)蠕變損傷模型(BNMC模型),該模型認(rèn)為巖石塑性屈服面隨蠕變時(shí)間動(dòng)態(tài)變化,在σ-τ空間內(nèi),強(qiáng)度包絡(luò)線(xiàn)隨蠕變時(shí)間的增加而逐漸內(nèi)移。采用線(xiàn)性插值法對(duì)該模型各蠕變參數(shù)進(jìn)行處理,獲得任意連續(xù)偏應(yīng)力水平對(duì)應(yīng)的蠕變模型參數(shù),從而實(shí)現(xiàn)BNMC模型的數(shù)值化。采用該模型對(duì)金川二礦區(qū)-1 098 m水平中段下盤(pán)運(yùn)輸巷的蠕變變形進(jìn)行數(shù)值模擬,對(duì)比研究未支護(hù)裸巷和噴錨支護(hù)巷道的蠕變變形規(guī)律。研究發(fā)現(xiàn),未支護(hù)裸巷圍巖塑性區(qū)邊界不是一成不變的,而是隨時(shí)間的發(fā)展,塑性區(qū)邊界逐漸向外擴(kuò)張,圍巖承載力逐漸下降,從而導(dǎo)致圍巖加速蠕變顯現(xiàn),巷道蠕變失穩(wěn);通過(guò)對(duì)噴錨支護(hù)巷道的蠕變數(shù)值模擬結(jié)果和多點(diǎn)位移計(jì)實(shí)測(cè)結(jié)果的對(duì)比,發(fā)現(xiàn)數(shù)值模擬曲線(xiàn)與實(shí)測(cè)曲線(xiàn)在走勢(shì)上基本吻合,但在量值上實(shí)測(cè)蠕變位移值要略大于數(shù)值模擬結(jié)果;由于支護(hù)與圍巖的相互作用,支護(hù)在一定程度上改變了圍巖的偏應(yīng)力狀態(tài)和位移,阻止了圍巖塑性區(qū)邊界擴(kuò)張,噴錨支護(hù)巷道在0~200 d的蠕變計(jì)算時(shí)段內(nèi),未呈現(xiàn)出加速蠕變性態(tài)。
[Abstract]:In order to study the inherent relationship between the creep damage process of rock and the extension of plastic zone of surrounding rock, a variable parameter creep damage model (BNMC model) based on plastic expansion is established. The model considers that the plastic yield surface of rock changes dynamically with creep time. In 蟽-蟿 space, the strength envelope gradually moves in with the increase of creep time. The creep parameters of the model are processed by linear interpolation method, and the creep model parameters corresponding to any continuous deflection stress level are obtained, thus the numerical value of the BNMC model is realized. The model is used to simulate the creep deformation of the bottom roadway in the middle section of -1098m horizontal level in Jinchuan No.2 Mining area, and the creep deformation of the roadway with unsupported bare roadway and shotcrete anchor support is comparatively studied. It is found that the plastic zone boundary of unsupported bare roadway is not invariable, but with the development of time, the plastic zone boundary gradually expands outward, and the bearing capacity of surrounding rock decreases gradually, which leads to the accelerated creep of surrounding rock and the creep instability of roadway. By comparing the creep numerical simulation results of shotcrete bolting roadway with the measured results of multi-point displacement meter, it is found that the numerical simulation curve is basically consistent with the measured curve, but the measured creep displacement value is a little larger than the numerical simulation result. Because of the interaction between support and surrounding rock, the support changes the state of deviant stress and displacement of surrounding rock to a certain extent, and prevents the boundary expansion of surrounding rock plastic zone. The creep calculation period of shotcrete-anchor supporting roadway is within 200 days. No accelerated creep behavior was observed.
【作者單位】： 湖南科技大學(xué)煤礦安全開(kāi)采技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室;湖南科技大學(xué)南方煤礦瓦斯與頂板災(zāi)害預(yù)防控制安全生產(chǎn)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51434006,51274097,51374104)
【分類(lèi)號(hào)】：TD313

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