本文選題：初期支護(hù) + 可靠度��； 參考：《西南石油大學(xué)》2014年碩士論文

【摘要】：新奧法是當(dāng)今隧道建設(shè)的主要方法。復(fù)合式襯砌則是新奧法施工的精髓部分。故復(fù)合式襯砌結(jié)構(gòu)的安全性問題是開展隧道結(jié)構(gòu)安全評價(jià)的核心問題。本文基于不確定性因素,為了解決在獲取隧道支護(hù)結(jié)構(gòu)可靠度過程中的諸多困難,包括各類參數(shù)的缺乏,各類因素重要性的差異以及結(jié)構(gòu)安全控制點(diǎn)應(yīng)力函數(shù)的不明確等等,提出了在單因素變化下,對比結(jié)構(gòu)危險(xiǎn)點(diǎn)應(yīng)力狀態(tài)來確定結(jié)構(gòu)的應(yīng)力函數(shù),進(jìn)而求取支護(hù)結(jié)構(gòu)可靠度的方法。同時(shí)也應(yīng)用蒙特卡洛法進(jìn)行了對比分析,做出了有意義的結(jié)論。另外一方面,在新奧法施工的地下結(jié)構(gòu)中,現(xiàn)場的監(jiān)控量測數(shù)據(jù)是對結(jié)構(gòu)安全狀態(tài)的重要評價(jià)方法。論文應(yīng)用灰色理論對實(shí)際的量測數(shù)據(jù)進(jìn)行了理論分析,預(yù)測了拱頂下沉位移總量和拱基水平收斂位移總量,并將其與有限元軟件計(jì)算的結(jié)果進(jìn)行了對比分析,驗(yàn)證了灰色理論的合理性。論文具體的主要研究內(nèi)容和結(jié)論如下： 1、基于實(shí)際隧道工程的斷面尺寸和支護(hù)參數(shù),應(yīng)用有限元軟件建立其理論模型,采用“地層—結(jié)構(gòu)”計(jì)算方法,獲得了初期支護(hù)結(jié)構(gòu)內(nèi)各節(jié)點(diǎn)的應(yīng)力發(fā)展變化情況,即‘結(jié)構(gòu)的軸力從拱頂?shù)竭厜χ饾u增大達(dá)到最大值后,從邊墻到隧道斷面最低點(diǎn)又逐漸減小。此結(jié)果與隧道力學(xué)理論相印證,為隧道施工人員提供了對邊墻部位進(jìn)行特殊加固的理論依據(jù)。 2、利用灰色理論和回歸分析對隧道結(jié)構(gòu)的量測數(shù)據(jù)進(jìn)行了分析,發(fā)現(xiàn)了在隧道施工過程中,圍巖發(fā)生最大位移的時(shí)間段為開挖后10天以內(nèi),為施工設(shè)計(jì)人員進(jìn)行支護(hù)結(jié)構(gòu)設(shè)計(jì)提供了理論參考；由灰色理論預(yù)測的量測前位移結(jié)果可以看出,實(shí)際隧道在進(jìn)行第一次測量前隧道已經(jīng)進(jìn)行了較大的沉降,由此提醒施工人員在隧道開挖后需盡快施作支護(hù)結(jié)構(gòu)。 3、利用單因素響應(yīng)面法對襯砌結(jié)構(gòu)的可靠度進(jìn)行計(jì)算,其過程簡單實(shí)用,包括對隨機(jī)變量的篩選和剔除都比較方便；對實(shí)際工程而言當(dāng)計(jì)算資料比較缺乏時(shí),應(yīng)用單因素響應(yīng)面法進(jìn)行襯砌結(jié)構(gòu)的可靠性分析,能夠獲得較為滿意的計(jì)算結(jié)果,有效的指導(dǎo)現(xiàn)場人員施工作業(yè)。 4、利用蒙特卡洛法對襯砌結(jié)構(gòu)的可靠度進(jìn)行計(jì)算,而且計(jì)算結(jié)果需要滿足一定精度時(shí),相比單因素響應(yīng)面法而言,蒙特卡洛法的計(jì)算量要大得多,而且都是重復(fù)性計(jì)算；另一方面,從對比500次和1000當(dāng)計(jì)算結(jié)果可以看出,隨著抽樣次數(shù)的增加,蒙特卡洛法的精度在不斷提高,但總的計(jì)算量也在飛速增加,由此決定了蒙特卡洛法只能應(yīng)用在對計(jì)算結(jié)果要求比較高,而且具有很強(qiáng)數(shù)據(jù)處理能力的施工建設(shè)中。
[Abstract]:The new Olympic method is the main method of tunnel construction nowadays. Compound lining is the essence of the construction of the New Olympic method. Therefore, the safety of composite lining structure is the core of tunnel structure safety evaluation. Based on the uncertainty factors, in order to solve many difficulties in the process of obtaining the reliability of the tunnel support structure, including the lack of various parameters, the difference of the importance of various factors and the uncertainty of the stress function of the structural safety control points, etc. A method of determining the stress function of the structure by comparing the stress state of the dangerous point of the structure with the change of single factor is put forward, and then the reliability of the supporting structure is obtained. At the same time, the Monte Carlo method is used to make a comparative analysis, and a meaningful conclusion is drawn. On the other hand, the monitoring data is an important method to evaluate the safety of the structure in the underground structure constructed by the New Austrian method. In this paper, the grey theory is applied to the theoretical analysis of the actual measurement data, the total subsidence displacement of the arch roof and the total horizontal convergent displacement of the arch foundation are predicted, and the results are compared with the results of the finite element software. The rationality of grey theory is verified. The main research contents and conclusions are as follows: 1. Based on the cross-section size and support parameters of actual tunnel engineering, the theoretical model is established by using finite element software, and the "stratigraphic structure" calculation method is adopted. The stress evolution of the joints in the initial support structure is obtained, that is, the axial force of the structure increases from the arch to the side wall to the maximum value, and then decreases from the side wall to the lowest point of the tunnel section. This result is confirmed by tunnel mechanics theory and provides theoretical basis for tunnel constructors to carry out special reinforcement of side wall. 2. Using grey theory and regression analysis, the measurement data of tunnel structure are analyzed. It is found that in the course of tunnel construction, the maximum displacement of surrounding rock occurs within 10 days after excavation, which provides a theoretical reference for construction designers to design the supporting structure, which can be seen from the results of pre-survey displacement predicted by grey theory. Before the first survey of the actual tunnel, the tunnel had already undergone a large settlement. Therefore, the constructors are reminded to use the single factor response surface method to calculate the reliability of the lining structure as soon as possible after the tunnel excavation. The process is simple and practical. It is convenient to screen and eliminate random variables, and the reliability of lining structure can be analyzed by single factor response surface method when the calculation data are scarce, and the satisfactory results can be obtained. 4. Monte Carlo method is used to calculate the reliability of lining structure, and when the calculation results need to meet certain precision, compared with single factor response surface method, The Monte Carlo method is much more complicated and repetitive. On the other hand, from the comparison of 1000 times and 500 times, it can be seen that the accuracy of Monte Carlo method increases with the increase of sampling times. However, the total amount of calculation is also increasing rapidly, which determines that Monte Carlo method can only be used in construction with high requirements for calculation results and strong data processing capacity.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.4

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