深埋硐室圍巖壓力上限解與結(jié)構(gòu)體系可靠度
發(fā)布時(shí)間：2018-11-08 07:24
【摘要】：摘要：地下工程作為巖土工程的一個(gè)重要研究方向,在交通、礦山、國防等工程領(lǐng)域發(fā)揮著重要作用。而深埋硐室穩(wěn)定性問題又是地下工程研究的焦點(diǎn)。如何對深埋硐室進(jìn)行準(zhǔn)確的安全評價(jià)是巖土工程師們一直關(guān)注的熱點(diǎn)。如何準(zhǔn)確獲得深埋硐室的圍巖壓力是巖土工程界的難點(diǎn)。極限分析理論基礎(chǔ)嚴(yán)謹(jǐn),分析過程簡單,在計(jì)算過程中不需要對彈塑性變形的全過程進(jìn)行分析,而直接關(guān)注于巖土的極限破壞狀態(tài),通過構(gòu)建機(jī)動容許的速度場以及靜力容許的應(yīng)力場,根據(jù)虛功率原理來求解深埋硐室圍巖壓力的上、下限解,是解決深埋硐室圍巖壓力的有效途徑之一。而關(guān)于深埋硐室安全性的評估,與安全系數(shù)相比較,可靠度作為評價(jià)安全性的指標(biāo)更為科學(xué)。因此,本文將極限分析方法與可靠性理論相結(jié)合,對深埋硐室的圍巖壓力和穩(wěn)定性問題進(jìn)行研究,為今后深埋硐室的支護(hù)設(shè)計(jì)和穩(wěn)定性評估提供理論依據(jù)。論文主要創(chuàng)新性成果如下： 1、構(gòu)建了深埋硐室平動與轉(zhuǎn)動相結(jié)合的破壞機(jī)制,即由“楔形塌落體+轉(zhuǎn)動圓弧體+n個(gè)平動三角形體”構(gòu)成,并且得到了深埋硐室圍巖壓力的最優(yōu)解。通過對比分析,當(dāng)三角形塊體數(shù)n變大時(shí),圍巖支護(hù)反力的上限值趨于穩(wěn)定,計(jì)算精度也變高；而當(dāng)n=3時(shí)則可滿足圍巖壓力的精度要求。此外,基于構(gòu)建的深埋硐室的破壞機(jī)制(三角形塊體數(shù)n=3),將本文極限分析方法計(jì)算所得的圍巖壓力與普氏理論以及數(shù)值模擬方法的計(jì)算結(jié)果進(jìn)行了對比,最大差值小于30%,則驗(yàn)證了本文深埋硐室破壞機(jī)制的合理性。 2、基于深埋硐室的破壞機(jī)制,利用極限分析上限定理分別得到了線性與非線性Mohr-Coulomb破壞準(zhǔn)則下圍巖壓力的解析解,并且分析了非線性系數(shù)以及巖土各參數(shù)對圍巖壓力的影響。 3、基于深埋硐室的破壞機(jī)制,利用極限分析上限定理得到了Hoek-Brown破壞準(zhǔn)則下圍巖壓力的解析解,并且分析了Hoek-Brown破壞準(zhǔn)則中各參數(shù)以及巖土各參數(shù)對圍巖壓力的影響。 4、分別建立了含單一和含多個(gè)功能函數(shù)的多失效模式相關(guān)下結(jié)構(gòu)體系可靠度的一般模型,提出了利用Monte Carlo模擬法直接進(jìn)行編程計(jì)算可靠度的方法,給出了具體的計(jì)算步驟和流程圖,并且基于不同模型分別得到了結(jié)構(gòu)體系可靠度的相對精確值。 5、基于Mohr-Coulomb破壞準(zhǔn)則和Hoek-Brown破壞準(zhǔn)則分別建立了多失效模式相關(guān)下深埋硐室結(jié)構(gòu)體系可靠性模型。采用MonteCarlo模擬法計(jì)算了模型的可靠度,通過參數(shù)敏感性分析得到了影響深埋硐室結(jié)構(gòu)體系可靠度的主要因素。 6、以通平高速公路的姜源嶺隧道以及山腳樹煤礦21128采區(qū)運(yùn)輸平巷為例,采用極限分析上限法計(jì)算了深埋硐室圍巖壓力的大小,并且與數(shù)值模擬和現(xiàn)場實(shí)測的結(jié)果進(jìn)行了對比,其一致性驗(yàn)證了本文方法的正確性。圖99幅,表61個(gè),參考文獻(xiàn)204篇。
[Abstract]:Abstract: as an important research direction of geotechnical engineering, underground engineering plays an important role in traffic, mining, national defense and other engineering fields. The stability of deep-buried chamber is the focus of underground engineering research. How to accurately evaluate the safety of deep-buried chambers is a hot spot that geotechnical engineers have been paying close attention to. How to accurately obtain the surrounding rock pressure of deep-buried chamber is a difficult point in geotechnical engineering. The theoretical basis of limit analysis is rigorous and the analysis process is simple. In the course of calculation, it is not necessary to analyze the whole process of elastic-plastic deformation, but to pay close attention to the limit failure state of rock and soil. According to the principle of virtual power, the upper and lower limit solutions of surrounding rock pressure of deep buried chamber are obtained by constructing the allowable velocity field of maneuver and the stress field of static tolerance. It is one of the effective ways to solve the surrounding rock pressure of deep buried chamber. Compared with the safety factor, the reliability is more scientific in evaluating the safety of the deep-buried chamber. Therefore, this paper combines the limit analysis method with the reliability theory to study the surrounding rock pressure and stability of the deep buried chamber, which provides the theoretical basis for the support design and stability evaluation of the deep buried chamber in the future. The main innovative achievements of this paper are as follows: 1. The failure mechanism of the combination of translational and rotational motion of deep chamber is constructed, which is composed of "n translational triangles of wedge collapse body rotating circular arc body". The optimum solution of surrounding rock pressure of deep chamber is obtained. Through comparison and analysis, when the number of triangular blocks n increases, the upper limit value of surrounding rock support reaction force tends to be stable, and the calculation accuracy becomes higher, while when n = 3, it can meet the precision requirement of surrounding rock pressure. In addition, based on the failure mechanism of the deep buried chamber (triangle block number nm3), the surrounding rock pressure calculated by the limit analysis method in this paper is compared with the calculation results of Pushmann theory and numerical simulation method. The maximum difference is less than 30, which verifies the rationality of the failure mechanism of the deep chamber in this paper. 2. Based on the failure mechanism of deep buried chamber, the analytical solutions of surrounding rock pressure under linear and nonlinear Mohr-Coulomb failure criteria are obtained by using the upper limit theorem of limit analysis, respectively. The influence of nonlinear coefficient and geotechnical parameters on surrounding rock pressure is analyzed. 3. Based on the failure mechanism of deep buried chamber, the analytical solution of surrounding rock pressure under Hoek-Brown failure criterion is obtained by using the upper limit theorem of limit analysis, and the influence of various parameters of Hoek-Brown failure criterion and geotechnical parameters on surrounding rock pressure is analyzed. 4. The general model of reliability of structure system with multiple failure mode correlation is established, and the method of programming reliability is put forward by using Monte Carlo simulation method. The detailed calculation steps and flow charts are given, and the relative accurate values of the reliability of the structure system are obtained based on different models. 5. Based on the Mohr-Coulomb failure criterion and the Hoek-Brown failure criterion, the reliability models of deep chamber structures with multiple failure modes are established. The reliability of the model was calculated by MonteCarlo simulation method, and the main factors affecting the reliability of deep chamber structure were obtained by parameter sensitivity analysis. 6. Taking Jiangyuanling Tunnel of Tongping Expressway and 21128 Mining area of Shanjiaoshu Coal Mine as examples, the pressure of surrounding rock of deep buried chamber is calculated by the upper limit method of limit analysis, and compared with numerical simulation and field measurement. Its consistency verifies the correctness of this method. There are 99 pictures, 61 tables and 204 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU45
本文編號：2317786
[Abstract]:Abstract: as an important research direction of geotechnical engineering, underground engineering plays an important role in traffic, mining, national defense and other engineering fields. The stability of deep-buried chamber is the focus of underground engineering research. How to accurately evaluate the safety of deep-buried chambers is a hot spot that geotechnical engineers have been paying close attention to. How to accurately obtain the surrounding rock pressure of deep-buried chamber is a difficult point in geotechnical engineering. The theoretical basis of limit analysis is rigorous and the analysis process is simple. In the course of calculation, it is not necessary to analyze the whole process of elastic-plastic deformation, but to pay close attention to the limit failure state of rock and soil. According to the principle of virtual power, the upper and lower limit solutions of surrounding rock pressure of deep buried chamber are obtained by constructing the allowable velocity field of maneuver and the stress field of static tolerance. It is one of the effective ways to solve the surrounding rock pressure of deep buried chamber. Compared with the safety factor, the reliability is more scientific in evaluating the safety of the deep-buried chamber. Therefore, this paper combines the limit analysis method with the reliability theory to study the surrounding rock pressure and stability of the deep buried chamber, which provides the theoretical basis for the support design and stability evaluation of the deep buried chamber in the future. The main innovative achievements of this paper are as follows: 1. The failure mechanism of the combination of translational and rotational motion of deep chamber is constructed, which is composed of "n translational triangles of wedge collapse body rotating circular arc body". The optimum solution of surrounding rock pressure of deep chamber is obtained. Through comparison and analysis, when the number of triangular blocks n increases, the upper limit value of surrounding rock support reaction force tends to be stable, and the calculation accuracy becomes higher, while when n = 3, it can meet the precision requirement of surrounding rock pressure. In addition, based on the failure mechanism of the deep buried chamber (triangle block number nm3), the surrounding rock pressure calculated by the limit analysis method in this paper is compared with the calculation results of Pushmann theory and numerical simulation method. The maximum difference is less than 30, which verifies the rationality of the failure mechanism of the deep chamber in this paper. 2. Based on the failure mechanism of deep buried chamber, the analytical solutions of surrounding rock pressure under linear and nonlinear Mohr-Coulomb failure criteria are obtained by using the upper limit theorem of limit analysis, respectively. The influence of nonlinear coefficient and geotechnical parameters on surrounding rock pressure is analyzed. 3. Based on the failure mechanism of deep buried chamber, the analytical solution of surrounding rock pressure under Hoek-Brown failure criterion is obtained by using the upper limit theorem of limit analysis, and the influence of various parameters of Hoek-Brown failure criterion and geotechnical parameters on surrounding rock pressure is analyzed. 4. The general model of reliability of structure system with multiple failure mode correlation is established, and the method of programming reliability is put forward by using Monte Carlo simulation method. The detailed calculation steps and flow charts are given, and the relative accurate values of the reliability of the structure system are obtained based on different models. 5. Based on the Mohr-Coulomb failure criterion and the Hoek-Brown failure criterion, the reliability models of deep chamber structures with multiple failure modes are established. The reliability of the model was calculated by MonteCarlo simulation method, and the main factors affecting the reliability of deep chamber structure were obtained by parameter sensitivity analysis. 6. Taking Jiangyuanling Tunnel of Tongping Expressway and 21128 Mining area of Shanjiaoshu Coal Mine as examples, the pressure of surrounding rock of deep buried chamber is calculated by the upper limit method of limit analysis, and compared with numerical simulation and field measurement. Its consistency verifies the correctness of this method. There are 99 pictures, 61 tables and 204 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU45
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，本文編號：2317786
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