济南市区岩质基坑稳定性分析及支护技术研究

发布时间：2018-05-15 05:25

本文选题：岩质基坑 + 破坏模式　；参考：《济南大学》2016年硕士论文

【摘要】：本论文以济南市区的地质环境条件为背景,采用“理论分析”和“数值模拟”相结合的思路,对济南市区岩质基坑的基坑类型、岩质基坑的特点、变形机制、破坏模式、稳定性理论评价以及支护技术方法等进行了比较系统的研究。(1)通过分析岩体的形成过程、岩体结构、岩体的赋存环境、岩体的结构面,对济南市区地下岩体的工程特性进行了分析。(2)根据岩质基坑开挖坡角角度的不同、基坑边壁倾向与岩层倾向角度的不同,划分了岩质基坑的不同类型。(3)通过对岩质基坑变形过程的力学分析,提出了五种岩体变形的基本组合形式和六种基坑破坏模式。(4)运用极限平衡法和相关的力学方法,对六种基坑破坏模式(平面滑动、圆弧滑动、楔体破坏、倾倒破坏、坑壁破坏、坑底隆起破坏)进行了稳定性分析,并推导了相应的稳定性系数计算公式。(5)详细分析了济南市区的地质构造、水文地质条件、地下岩石分布以及不良地质情况,并用FLAC3D数值模拟软件,模拟了岩质基坑的开挖过程,分析了基坑坑壁沿结构面的应力变化;同时,也对结构面影响参数与基坑临界稳定性之间的对应关系,进行了模拟分析。(6)对济南市区岩质基坑的支护技术,分析了支护设计时所需要考虑的因素,并提出了有效的支护措施,包括挂网喷护+防护锚杆、支护锚杆+防护锚杆的形式、上部放坡+下部锚杆(分为防护锚杆和支护锚杆)、上部锚杆+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.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU753

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