發(fā)布時(shí)間：2019-05-24 22:55

【摘要】：在深部開采環(huán)境下,巷道圍巖體通常表現(xiàn)出顯著的高地壓、大變形、長(zhǎng)時(shí)間持續(xù)流變等特性,給深部巷道的支護(hù)與維護(hù)問題帶來了嚴(yán)峻的挑戰(zhàn)。研究深部高應(yīng)力軟巖巷道圍巖時(shí)效變形機(jī)制,對(duì)于保障深部巷道圍巖長(zhǎng)期穩(wěn)定具有十分重要的意義。本文綜合運(yùn)用理論分析、數(shù)值模擬與現(xiàn)場(chǎng)監(jiān)測(cè)相結(jié)合的方法,深入研究了深部高應(yīng)力軟巖巷道圍巖的時(shí)效變形過程及失穩(wěn)機(jī)理,主要研究成果如下:(1)基于經(jīng)典的流變力學(xué)與塑性力學(xué)理論,建立了一種由Burgers流變模型和線性應(yīng)變軟化模型串聯(lián)的軟巖黏彈塑性應(yīng)變軟化蠕變力學(xué)模型,并推導(dǎo)了相應(yīng)的三維蠕變本構(gòu)方程。與傳統(tǒng)的軟巖蠕變模型相比,該模型能夠很好的表征軟巖第三階段的加速蠕變特性。(2)在FLAC3D內(nèi)置Cvisc蠕變模型的基礎(chǔ)上,對(duì)建立的軟巖黏彈塑性應(yīng)變軟化蠕變模型進(jìn)行了二次開發(fā)。運(yùn)用自定義開發(fā)的軟巖黏彈塑性應(yīng)變軟化蠕變程序,建立了軟巖三軸壓縮蠕變?cè)囼?yàn)數(shù)值計(jì)算模型,分析了軟巖峰后應(yīng)變軟化特征和蠕變變形規(guī)律,數(shù)值模擬結(jié)果與實(shí)驗(yàn)結(jié)果基本吻合,證明了建立的軟巖黏彈塑性應(yīng)變軟化模型的有效性。(3)基于自定義開發(fā)的軟巖黏彈塑性應(yīng)變軟化蠕變分析程序,運(yùn)用FLAC3D建立了深部高應(yīng)力軟巖巷道三維數(shù)值計(jì)算模型,深入研究了不同地應(yīng)力環(huán)境下軟巖巷道圍巖變形、應(yīng)力、塑性區(qū)等隨著時(shí)間的演化規(guī)律,揭示了深部高應(yīng)力軟巖巷道圍巖的時(shí)效變形過程及失穩(wěn)機(jī)理。(4)以某礦-1000m水平大巷的具體工程地質(zhì)條件為背景,運(yùn)用自定義開發(fā)的黏彈塑性應(yīng)變軟化蠕變分析程序,研究了該巷道在原支護(hù)方案下錨桿受力變化、圍巖變形及圍巖塑性區(qū)擴(kuò)展隨時(shí)間的變化規(guī)律,并針對(duì)該巷道圍巖的時(shí)效變形破壞特征,提出了以錨注為核心的耦合支護(hù)體系,有效地控制了該巷道圍巖的劇烈流變,確保了巷道圍巖的長(zhǎng)期穩(wěn)定。
[Abstract]:In the deep mining environment, the surrounding rock mass of roadway usually shows obvious high ground pressure, large deformation, long time continuous flow and other characteristics, which brings severe challenges to the support and maintenance of deep roadway. It is of great significance to study the aging deformation mechanism of surrounding rock of deep high stress soft rock roadway to ensure the long-term stability of surrounding rock of deep roadway. In this paper, the aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are deeply studied by using the method of theoretical analysis, numerical simulation and field monitoring. The main research results are as follows: (1) based on the classical theory of Rheology and plasticity, a viscous elastic-plastic strain-softened creep mechanical model of soft rock is established, which is composed of Burgers Rheological Model and Linear strain softened Model. The corresponding three-dimensional creep constitutive equation is derived. Compared with the traditional soft rock creep model, this model can well characterize the accelerated creep characteristics of the third stage of soft rock. (2) on the basis of FLAC3D built-in Cvisc creep model, The Visco-elastic-plastic strain softened creep model of soft rock was developed. The numerical calculation model of triaxial compression creep test of soft rock is established by using the Visco-elastic-plastic strain softened creep program of soft rock, and the strain softened characteristics and creep deformation law of soft rock after peak are analyzed. The numerical simulation results are in good agreement with the experimental results, which proves the effectiveness of the established Visco-elastic-plastic strain softening model for soft rock. (3) based on the self-developed program for the analysis of viscous elastic-plastic strain softened creep of soft rock, The three-dimensional numerical calculation model of deep high stress soft rock roadway is established by using FLAC3D, and the evolution law of surrounding rock deformation, stress and plastic zone with time under different ground stress environment is deeply studied. The aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are revealed. (4) based on the specific engineering geological conditions of a mine-1000m horizontal roadway, a custom developed Visco-elastic-plastic strain softened creep analysis program is used. The variation of bolt force, deformation of surrounding rock and expansion of plastic zone of surrounding rock with time are studied under the original supporting scheme. According to the aging deformation and failure characteristics of surrounding rock of the roadway, a coupling support system with anchor and grouting as the core is put forward. The violent flow of the surrounding rock of the roadway is effectively controlled and the long-term stability of the surrounding rock of the roadway is ensured.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD353

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