發(fā)布時間：2018-05-15 05:25

  本文選題：巖質(zhì)基坑 + 破壞模式��； 參考：《濟(jì)南大學(xué)》2016年碩士論文

【摘要】：本論文以濟(jì)南市區(qū)的地質(zhì)環(huán)境條件為背景,采用“理論分析”和“數(shù)值模擬”相結(jié)合的思路,對濟(jì)南市區(qū)巖質(zhì)基坑的基坑類型、巖質(zhì)基坑的特點(diǎn)、變形機(jī)制、破壞模式、穩(wěn)定性理論評價以及支護(hù)技術(shù)方法等進(jìn)行了比較系統(tǒng)的研究。(1)通過分析巖體的形成過程、巖體結(jié)構(gòu)、巖體的賦存環(huán)境、巖體的結(jié)構(gòu)面,對濟(jì)南市區(qū)地下巖體的工程特性進(jìn)行了分析。(2)根據(jù)巖質(zhì)基坑開挖坡角角度的不同、基坑邊壁傾向與巖層傾向角度的不同,劃分了巖質(zhì)基坑的不同類型。(3)通過對巖質(zhì)基坑變形過程的力學(xué)分析,提出了五種巖體變形的基本組合形式和六種基坑破壞模式。(4)運(yùn)用極限平衡法和相關(guān)的力學(xué)方法,對六種基坑破壞模式(平面滑動、圓弧滑動、楔體破壞、傾倒破壞、坑壁破壞、坑底隆起破壞)進(jìn)行了穩(wěn)定性分析,并推導(dǎo)了相應(yīng)的穩(wěn)定性系數(shù)計(jì)算公式。(5)詳細(xì)分析了濟(jì)南市區(qū)的地質(zhì)構(gòu)造、水文地質(zhì)條件、地下巖石分布以及不良地質(zhì)情況,并用FLAC3D數(shù)值模擬軟件,模擬了巖質(zhì)基坑的開挖過程,分析了基坑坑壁沿結(jié)構(gòu)面的應(yīng)力變化;同時,也對結(jié)構(gòu)面影響參數(shù)與基坑臨界穩(wěn)定性之間的對應(yīng)關(guān)系,進(jìn)行了模擬分析。(6)對濟(jì)南市區(qū)巖質(zhì)基坑的支護(hù)技術(shù),分析了支護(hù)設(shè)計(jì)時所需要考慮的因素,并提出了有效的支護(hù)措施,包括掛網(wǎng)噴護(hù)+防護(hù)錨桿、支護(hù)錨桿+防護(hù)錨桿的形式、上部放坡+下部錨桿(分為防護(hù)錨桿和支護(hù)錨桿)、上部錨桿+下部直立等。
[Abstract]:In this paper, based on the geological environment of Jinan urban area, the author combines "theoretical analysis" and "numerical simulation" to analyze the type, characteristics, deformation mechanism and failure mode of rock foundation pit in Jinan urban area. Based on the analysis of rock mass formation process, rock mass structure, rock mass occurrence environment, rock mass structure, rock mass structure, The engineering characteristics of underground rock mass in Jinan urban area are analyzed. (2) according to the different angle of excavation slope angle of rock foundation pit, the inclination of side wall of foundation pit is different from that of rock stratum. Based on the mechanical analysis of deformation process of rock foundation pit, five basic combination forms of rock deformation and six failure modes of foundation pit are put forward. The limit equilibrium method and related mechanics method are used. The stability analysis of six kinds of foundation pit failure modes (plane sliding, arc sliding, wedge failure, toppling failure, pit wall failure, bottom uplift failure) is carried out. The corresponding formula for calculating stability coefficient is derived.) the geological structure, hydrogeological conditions, distribution of underground rocks and bad geological conditions in Jinan urban area are analyzed in detail, and the excavation process of rock foundation pit is simulated by FLAC3D numerical simulation software. The stress variation of pit wall along the structural plane is analyzed, and the corresponding relation between the influence parameters of the structure plane and the critical stability of the foundation pit is also analyzed, and the supporting technology of rock foundation pit in Jinan urban area is simulated and analyzed. This paper analyzes on the factors to be considered in the design of support, and puts forward some effective supporting measures, including the form of supporting bolt, and the form of supporting bolt. The upper slope and the lower anchor are divided into protective anchor and supporting bolt, and the upper anchor is vertical in the lower part, and so on.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU753

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本文編號：1891177