【作者】 陈祥；

【导师】 陈庆寿； 孙进忠；

【作者基本信息】 中国地质大学（北京） ， 岩土工程， 2007， 博士

【摘要】 黄岛地下水封石油洞库位于山东省青岛市黄岛区,是我国近期拟建的国家战略石油储备库之一,其建成后将是我国第一座地下原油储备库,本文以黄岛地下水封石油洞库工程为题,在工程岩体质量评价、地应力场分析、洞室围岩稳定性分析及岩爆判别四个方面展开了较深入的研究。工程岩体质量评价是地下洞室工程选址、设计所必须回答的主要工程地质问题,在许多常用的岩体质量评价方法中,岩体的完整性指数(Kv)是一个重要评价指标,而由于岩芯卸荷效应和室内、原位波速测试的频率差异以及样品采取、测试仪器等方面的原因导致完整性指数不能够准确的表示岩体的完整程度,有时甚至会产生完整性指数大于1的不合理的现象。本论文针对以上问题进行了相关的试验,提出了岩块卸荷指标和频率修正系数两个因子对岩体完整性指数计算公式进行修正,进而对国标BQ岩体分级法进行改进,根据改进的BQ岩体分级法,库址区绝大部分岩体质量都为I级。利用Flac数值计算软件的内嵌fish语言编制了阻尼最小二乘拟合程序,将拟合计算与应力数值计算结合在一起,实现自动拟合分析,并利用这套拟合程序对库址区Zk17#钻孔水压致裂地应力测试结果进行拟合,得出库址区地应力分布。根据拟合结果得出,库址区内最大主应力值一般为10~12MPa,中间主应力值为6~8MPa,最小主应力基本受岩体自重控制,最大主应力方向为水平NWW向,最小主应力方向为竖直方向,库址区属于低-中地应力区。论文中采用Flac3D计算软件对黄岛地下水封石油洞库的一个洞罐进行分析,模拟实际的开挖工序,分析地下洞室围岩的变形情况、稳定性以及洞群开挖时洞室间的相互作用。数值分析时,提出多种根据岩体、岩块的动参数,结合岩块的静参数确定岩体静参数的方法,以此来确定计算所需的岩体的变形参数和强度参数。模型边界条件充分利用地应力数值模拟的结果,计算结果表明黄岛地下水封油库地下洞室开挖后围岩虽然发生了一定的变形,但都未发生破坏现象。根据众多文献提出3个最能控制岩爆发生的指标:围岩二次应力最大主应力与岩石抗压强度比、岩爆倾向性指数和岩体完整性指数,以这三个指标为影响因素,采用可拓方法对岩爆发生进行判断,并在黄岛地下水封石油洞库工程中进行应用,计算结果表明黄岛地下水封石油洞库工程地下洞室开挖后不会产生岩爆。更多还原

【Abstract】 Huangdao water sealed underground oil tank lies in Huangdao district, ShanDong province, which is one of strategic oil storages to be built recently and is the first underground oil storage in our country. This thesis takes Huangdao water sealed underground oil tank engineering as study object, and does further researches on equality evaluation of engineering rock mass, analysis of geo-stresses, stability analysis of adjacent rock mass and judgement of rock burst.Quality evaluation of engineering rock mass is necessary for site election and design of underground cave engineering. For most evaluating methods of engineering rock mass, the integrality index is an important assessment factor. However, sometimes the integrality index is more than 1.0 because of unloading effect of rock samples and differentia of frequency between the measurements of rock samples and rock mass. In order to solve this problem, unloading index and frequency correcting coefficient are brought out in the thesis. Moreover, the BQ evaluating method which is put forward in the state standard (GB50218-94) is improved according the unloading index and the frequency correcting coefficient. The improved BQ method is used to evaluate the rock mass of Huangdao water sealed underground oil tank engineering, and the results show that the quality of rock mass in the engineering site are very good.The damping least square method is programmed with the fish language of FLAC which is one of numerical computation software to combine the numerical computation with the fitting computation and realize the automatism of the fitting analysis. With this set of fitting method, the measuring results of the hydraulic fracturing test in the zk17 bore are fitted with the computing results to get the distribution of the geo-stresses in the tank site. According to the fitting results, the maximal horizontal principal stress is 10~12 MPa, the middle principal stress is 6~8 MPa, and the minimal horizontal principal stress is controlled by the weight of the rock mass. The tank site belongs to the low geo-stress zone.In the thesis, the deformation, the stability and the reciprocity of the adjacent rock mass of underground caverns are analyzed with FLAC. In the analysis, many methods to determine the parameters of rock mass are brought forward, and the stress boundary conditions are determined by the fitting results of geo-stress. The numerical computing results show that the adjacent rock mass is made a little deformation, butthey aren’t damaged.According to lots of documents, three factors controlling rock burst: the ratio between the maximal principal one of the circumference stresses and the compress intensity of rock samples, the orientation index of rock burst and the integrality index of rock mass, are put forward in the thesis. According to the three factors, the rock burst is judged with the extension method. In the light of analysis with the extension method, rock burst doesn’t occur after the underground caverns were excavated.更多还原