【摘要】：隧道洞口段開挖作業(yè)是整個(gè)隧道施工過程中的咽喉工程,地位之重要不言而喻。然而洞口段圍巖一般埋深較淺、風(fēng)化嚴(yán)重,在開挖過程中經(jīng)常會(huì)出現(xiàn)坍塌、冒頂?shù)雀鞣N工程事故,所以隧道洞口段圍巖的開挖穩(wěn)定性研究一直是非常重要的課題之一。洞口段開挖穩(wěn)定性影響因素有很多,即包括地質(zhì)構(gòu)造、圍巖性質(zhì)、地下水等非施工因素,也包括開挖方式、開挖進(jìn)尺、預(yù)支護(hù)形式等施工因素。若洞口段施工時(shí)選擇的開挖支護(hù)工法不合理,就會(huì)很容易造成工程事故,引發(fā)不必要的人員傷亡和財(cái)產(chǎn)損失。針對(duì)隧道工程中洞口段開挖穩(wěn)定性等問題,本文重點(diǎn)研究在管棚支護(hù)作用下施工因素對(duì)其產(chǎn)生的影響。本文基于強(qiáng)度折減法基本原理,利用正交試驗(yàn)設(shè)計(jì)方法并結(jié)合有限元軟件ABAQUS對(duì)管棚預(yù)支護(hù)作用下隧道洞口段的穩(wěn)定性施工影響因素進(jìn)行相關(guān)研究。在施工影響因素方面本文選擇開挖方式、開挖進(jìn)尺、初期支護(hù)厚度、管棚直徑、管棚布置范圍和管棚注漿半徑等,并根據(jù)相關(guān)文獻(xiàn)定出每種施工因素的取值范圍,然后按照正交設(shè)計(jì)原理安排數(shù)值模擬方案。在此基礎(chǔ)上應(yīng)用有限元軟件ABAQUS建立三維數(shù)值模型,分析各施工因素對(duì)隧道洞口段邊仰坡穩(wěn)定性和隧洞穩(wěn)定性的影響。分析隧道洞口段邊仰坡穩(wěn)定性時(shí),本文將選擇穩(wěn)定性安全系數(shù)作為分析指標(biāo),研究開挖方式等六種施工因素對(duì)穩(wěn)定安全系數(shù)的影響程度,將其按數(shù)值的大小排列出來,以此得到影響邊仰坡穩(wěn)定性的關(guān)鍵施工因素;與此同時(shí),分析每一因素的不同取值對(duì)穩(wěn)定性安全系數(shù)的影響,得出穩(wěn)定安全系數(shù)隨各影響因素的不同取值而變化的趨勢(shì)。分析隧洞穩(wěn)定性時(shí),本文選擇拱頂處、拱底處、左拱腰處和右拱腰處四個(gè)位移測(cè)量點(diǎn),然后以這些測(cè)量點(diǎn)的位移值作為分析指標(biāo),研究施工影響因素對(duì)各測(cè)點(diǎn)位移值的影響程度,將其按數(shù)值的大小排列出來,得到影響隧洞穩(wěn)定性的關(guān)鍵施工因素;然后分析每一因素的不同取值對(duì)各測(cè)點(diǎn)位移的影響,得出各測(cè)點(diǎn)位移隨影響因素不同取值而的變化趨勢(shì)。
[Abstract]:The excavation operation of tunnel entrance section is the throat engineering in the whole tunnel construction process, and the importance of the position is self-evident. However, the surrounding rock of the entrance section is generally shallow and weathered seriously, and there are often various engineering accidents such as collapse and roof fall in the process of excavation, so the study on the excavation stability of the surrounding rock of the tunnel entrance section has always been one of the very important topics. There are many factors affecting the excavation stability of the entrance section, including geological structure, surrounding rock properties, groundwater and other non-construction factors, as well as excavation methods, excavation measures, pre-support forms and other construction factors. If the excavation and support method selected in the construction of the entrance section is unreasonable, it will easily cause engineering accidents and cause unnecessary casualties and property losses. In order to solve the problems of excavation stability in tunnel engineering, this paper focuses on the influence of construction factors on it under the action of pipe shed support. In this paper, based on the basic principle of strength reduction method, the influencing factors of tunnel entrance stability under the action of pipe shed pre-support are studied by using orthogonal experimental design method and finite element software ABAQUS. In the aspect of construction influencing factors, this paper selects excavation method, excavation scale, initial support thickness, pipe shed diameter, pipe shed layout range and pipe shed grouting radius, and determines the value range of each construction factor according to the relevant literature. Then the numerical simulation scheme is arranged according to the principle of orthogonal design. On this basis, the finite element software ABAQUS is used to establish a three-dimensional numerical model to analyze the influence of various construction factors on the stability of the side slope and the stability of the tunnel at the entrance of the tunnel. When analyzing the stability of the slope at the entrance of the tunnel, this paper selects the stability safety factor as the analysis index, studies the influence degree of six construction factors, such as excavation mode, on the stability safety factor, and arranges them according to the numerical value. The key construction factors affecting the stability of slope are obtained. At the same time, the influence of different values of each factor on the stability safety factor is analyzed, and the trend of the stability safety factor changing with the different values of each influencing factor is obtained. When analyzing the stability of the tunnel, this paper selects four displacement measuring points at the arch roof, the bottom of the arch, the left arch waist and the right arch waist, and then takes the displacement values of these measuring points as the analysis index. The influence degree of construction influencing factors on the displacement value of each measuring point is studied, and the key construction factors affecting the stability of the tunnel are obtained by arranging it according to the numerical value. Then the influence of the different values of each factor on the displacement of each measuring point is analyzed, and the changing trend of the displacement of each measuring point with the different values of the influencing factors is obtained.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455

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