本文關(guān)鍵詞： 高地應(yīng)力區(qū) 隧洞 圍巖質(zhì)量評價(jià) 陡傾層狀巖體 塊體理論 巖爆預(yù)測　出處：《新疆農(nóng)業(yè)大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：隨著我國基礎(chǔ)設(shè)施建設(shè)的高速發(fā)展,隧洞工程不斷朝著“多、長、大、深”的方向邁進(jìn),地應(yīng)力逐漸增加的同時(shí),隧址區(qū)域內(nèi)地質(zhì)條件差別也隨之變大,使得圍巖失穩(wěn)破壞程度增大、破壞形式呈現(xiàn)多樣化,大大提高了圍巖變形破壞機(jī)制的復(fù)雜性和不可預(yù)見性。因此,高地應(yīng)力條件下隧洞圍巖穩(wěn)定性相關(guān)問題的研究成為亟需解決的問題。目前對高地應(yīng)力條件下隧洞圍巖面臨的關(guān)鍵問題,如圍巖質(zhì)量評價(jià)、陡傾層狀巖體圍巖穩(wěn)定性分析、塊狀巖體圍巖穩(wěn)定性分析、圍巖力學(xué)參數(shù)位移敏感性分析以及巖爆預(yù)測等方面進(jìn)行的系統(tǒng)分析研究尚不成熟。正是基于上述問題,本文以新疆克州布倫口—公格爾水電站地下洞室為工程背景,采用新的研究思路,綜合應(yīng)用工程地質(zhì)學(xué)、固體力學(xué)理論、非線性科學(xué)理論和數(shù)值計(jì)算方法等,開展高地應(yīng)力條件下隧洞圍巖質(zhì)量評價(jià)和穩(wěn)定性研究,論文的主要研究內(nèi)容和研究成果概況如下:(1)提出基于非對稱貼近度準(zhǔn)則代替最大隸屬度準(zhǔn)則和最小鑒別信息原理組合權(quán)重代替單一權(quán)重的改進(jìn)可拓理論進(jìn)行圍巖質(zhì)量評價(jià),并將其應(yīng)用于布倫口—公格爾水電站地下洞室4個(gè)典型標(biāo)段的圍巖質(zhì)量評價(jià)中,結(jié)果表明該方法可靠性較好。(2)建立陡傾層狀圍巖彎曲—滑移失穩(wěn)力學(xué)模型,根據(jù)彈性板能量原理推導(dǎo)出層狀圍巖臨界彎曲長度和安全系數(shù)公式,結(jié)合實(shí)際工程研究臨界彎曲長度的影響因素�？紤]到圍巖參數(shù)不確定性,將模糊隨機(jī)可靠度理論應(yīng)用到安全系數(shù)公式當(dāng)中,計(jì)算結(jié)果表明考慮參數(shù)的模糊隨機(jī)性更具有良好的適用性。(3)建立等厚度層狀巖質(zhì)矩形板力學(xué)模型,計(jì)算巖質(zhì)矩形板在靜力荷載作用下的臨界荷載公式和在縱向周期性荷載作用下的第一、第二動(dòng)力不穩(wěn)定區(qū)域,分析巖質(zhì)矩形板是否發(fā)生靜動(dòng)力失穩(wěn)。(4)將有限長跡線塊體理論應(yīng)用到關(guān)鍵塊體滑落概率分析中,以三棱錐為例,根據(jù)結(jié)構(gòu)面跡長概率分布理論將關(guān)鍵塊體概率重新定義為絕對關(guān)鍵塊體概率、相對關(guān)鍵塊體概率和非關(guān)鍵塊體概率,并利用絕對關(guān)鍵塊體概率對常規(guī)關(guān)鍵塊體滑動(dòng)安全系數(shù)進(jìn)行修正,在保證圍巖安全條件下為合理降低圍巖支護(hù)成本提供理論依據(jù)。(5)鑒于圍巖力學(xué)參數(shù)的不確定性和空間變異性,結(jié)合室內(nèi)試驗(yàn)和工程經(jīng)驗(yàn),擬合出包括密度在內(nèi)的6個(gè)典型參數(shù)的概率分布模型,在3DEC離散元數(shù)值模擬的基礎(chǔ)上提出基于圍巖力學(xué)參數(shù)概率分布模型的灰關(guān)聯(lián)位移敏感性分析方法,并將其應(yīng)用于實(shí)際工程中,為圍巖參數(shù)的主次選擇提供理論指導(dǎo)。(6)將粗糙集理論和云模型相結(jié)合,建立基于FCM粗糙集理論計(jì)算權(quán)重和云模型計(jì)算綜合確定度的巖爆非線性科學(xué)預(yù)測模型,并通過實(shí)例驗(yàn)證表明該預(yù)測模型與可拓理論預(yù)測結(jié)果和Russense判別結(jié)果較吻合,最后將該預(yù)測模型成功應(yīng)用于布倫口—公格爾水電站地下洞室的巖爆評價(jià)中,為降低巖爆災(zāi)害損失造起到重要作用。
[Abstract]:With the rapid development of China's infrastructure construction, tunnel construction ceaselessly ", long, large, deep into the" direction, stress gradually increases at the same time, the geological conditions of the tunnel site area difference becomes larger, the instability of the surrounding rock damage increases, failure forms are diversified, greatly improve the surrounding rock the deformation failure mechanism of the complexity and unpredictability. Therefore, high research on issues related to the stability of surrounding rock of tunnel stress condition has become a urgent problem. The key problems of high geostress tunnel surrounding rock stress, such as rock quality evaluation, the stability analysis of rock bedded slope is steep, the stability analysis of rock mass. System analysis of surrounding rock displacement and sensitivity analysis of mechanical parameters of rock burst prediction is not mature. It is based on the above problems, this paper takes Xinjiang Kezhou Bulunkou - male Koal Hydropower Station underground tunnel as the engineering background, using the new method and the comprehensive application of engineering geology, solid mechanics, nonlinear science theory and numerical calculation method, the stress condition of surrounding rock quality evaluation and stability study of the Highlands, the main research contents and results are as follows: (1) put forward the improvement non symmetric Closeness criterion instead of the maximum membership criterion and the minimum information discrimination principle combined weights instead of single weight extension theory based on rock quality evaluation, and the rock quality evaluation of its application in Bulunkou GongGeEr - underground hydropower stations of 4 typical sections, the results show that this method has better reliability (2). The establishment of steep layered rock bending - slip instability mechanics model based on elastic plate energy derived from the principle of layered rock critical bending length and safety coefficient formula, combined with To study the influencing factors on the critical bending length of actual engineering. Considering the rock parameter uncertainty, the fuzzy random reliability theory is applied to safety coefficient formula, the calculation results show that considering the parameters of the fuzzy randomness has good applicability. (3) the establishment of the thickness of layered rock mass mechanics model of rectangular plate, the critical load formula the calculation of rock plate under static load and in longitudinal cyclic loading under the first, second dynamic instability regions, analysis of rock mass of rectangular plate is static and dynamic instability. (4) the finite length trace block application theory to key block sliding probability analysis, with three as the pyramid cases, according to the theory of structural plane trace length probability distribution of key block probability is redefined as the absolute key block probability, relative key block probability and non key block probability, and use the absolute key block probability of The conventional key block sliding safety factor is corrected, in ensuring the safe condition of surrounding rock is reasonable to reduce the cost of support surrounding rock provides theoretical basis. (5) the uncertainty and spatial variability of the mechanical parameters of surrounding rock, combining with laboratory test and engineering experience, fitting a probability distribution model of 6 typical parameters including density, the based on 3DEC simulation, discrete element numerical gray correlation analysis method is put forward on the displacement sensitivity probability distribution model based on rock mechanics parameters, and its application in practical engineering, the selection of parameters for the surrounding rock and provide theoretical guidance. (6) the rough set theory and cloud model are combined to establish FCM rough set theory calculation the weights and the cloud model calculating the comprehensive nonlinear science degree based on rock burst prediction model, and we verify the theoretical results and extension and the prediction model of Russense discriminant The results are consistent. Finally, the prediction model is successfully applied to the rock burst evaluation of the underground cavern of the brenkou Gong Ge hydropower station, which plays an important role in reducing the losses caused by rock burst.

【學(xué)位授予單位】：新疆農(nóng)業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TV554

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