共查询到20条相似文献，搜索用时 234 毫秒
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隧道工程地质评价的内容和方法 总被引：2，自引：0，他引：2
结合工程隧道实际,首先阐述了隧道工程的基本地质环境和工程地质条件,然后针对隧道工程可能出现的不良地质现象和可采取的工程措施,从大气降水、围岩稳定、围岩压力、洞口稳定、隧道比选等角度探讨隧道工程地质评价的主要方法和一般内容,进行隧道工程地质评价,为隧道施工、支护提供了依据. 相似文献
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为研究复杂工程地质条件下的隧道围岩在施工过程中的力学特征,以陕西省石泉县喜河—后柳改建公路的拟建隧道为研究对象,以有限元为研究方法,基于其地形地貌、地层岩性、水文地质等工程地质特征数据,形成模型相关参数,以此建立隧道三维地质数值分析模型,利用隧道钝化模拟单向全断面开挖的施工工况,探讨其应力分布特征及变化规律。结果表明:开挖的隧道会表现出显著的应力集中现象,其对隧道顶部围岩稳定性影响最大;在本模型中,隧道开挖未支护时,天然应力处于临界状态的中风化绿泥石石英片岩和断层带整体处于破坏的应力状态,而开挖前相当稳定的微风化绿泥石石英片岩、微风化石灰岩、微风化闪长岩在开挖时大部分处于稳定状态,只有局部处于破坏状态,而微风化碳质石英片岩稳定性不受影响;在参考监测数据中,中风化绿泥石石英片岩开挖后失稳,其他岩层处于稳定状态。 相似文献
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亚洲最高的公路隧道—大坂山公路隧道,由于海拔高、寒冻作用强烈和地质构造复杂,决定了隧道工程地质条件的复杂。叙述了隧道址的地理地质背景条件及其对隧道工程的影响。隧道施工结果表明,勘探成果的可信度较高。 相似文献
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通过镇安隧道工程地质特征分析、隧道围岩地质特征方面的论述,提出了隧道围岩分级的方法;进行了隧道围岩分级参数的选取研究,达到了隧道围岩分级合理选取的效果,解决了隧道施工对围岩稳定性预测的问题. 相似文献
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裂隙、断层等不良地质体是隧道施工的极大安全隐患。在克承隧道勘察中使用高密度电阻率法在探查覆盖层厚度、裂隙、断层、破碎带等地质构造方面有良好的效果,为后期施工提供安全保障。文章通过工程实例,探讨了高密度电阻率法在隧道勘查中的应用效果。 相似文献
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刘玉海 《地球科学与环境学报》1992,(2)
刘国昌教授,男,1912年10月出生于河北省饶阳县,1936年毕业于北京大学地质系,早年从事地质矿产调查和研究,解放后根据国家建设的需要,转入地质教育事业,在我国最先创建了水文地质工程地质专业,是我国著名的工程地质学家、地质教育家。他曾先后长期担任长春地质学院水文地质工程地质系主任和西安地质学院副院长等职,现任西安地质学院工程地质水文地质研究所所长、中国地质学会理事、地质力学专业委员会副主任、中国地质学会工程地质专业委员 相似文献
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赵强 《地球科学与环境学报》1992,(4)
胡广韬教授1927年生于山东省牟平县,1952年毕业于山东大学地质矿产系,1956年毕业于长春地质学院工程地质研究生进修班。几十年来,胡广韬教授先后在青岛工学院、西安交通大学、陕西工业大学、西安地质学院等高等院校从事工程地质、环境工程地质的教学和滑坡灾害的科研工作;现任西安地质学院水文地质与工程地质研究所顾问;兼任地矿部工程地质课程教学指导委员会副主任委员、中国地质灾害研究会理事、中国工程地质专业委员会委员、中国岩石地面工程专业委员会委员、陕西省水电工程学会常务理事及工程地质勘测专业委员会主任委员、陕西省岩石力学与工程学会常务理事 相似文献
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以厦门某海底隧道勘察为靶区,采用电磁气泡震源系统激发地震波,在火成岩发育区进行水域地震映像实验,较好地查明了海底水深界面、淤泥（砂层）和基岩面的分界线。实验结果表明,水域地震映像法对海域火成岩发育区是一种有效的物探方法,可以为海域地质勘察提供可靠的地质参考依据;利用水域地震映像勘探既可以较好地弥补钻探缺陷,又能极大地节约经济成本。 相似文献
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Some unfavorable geological conditions can affect the construction of tunnels.In order to evaluate the damage degree of tunnel construction and determine the surrounding rock grade and stability of the tunnel,the authors used high-density resistivity method to detect the surrounding rocks of Shimodong tunnel in Xicheng Town of Helong City.The underground resistivity structures of the entrance,exit and middle parts of the tunnel are obtained.Through analysis,it is found that there are no bedrock faults near the tunnel,although some joints and fissures are developed in some locations,which are characterized by low-resistivity anomalies.The tunnel structures are stable overall,favorable for safe and efficient construction.The study also proves the good application effect of the high-density resistivity method in tunnel safety detection. 相似文献
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Weak rock zone (soft interlayer, fault zone and soft rock) is the highlight of large-scale geological engineering research.
It is an important boundary for analysis of rock mass stability. Weak rock zone has been formed in a long geological period,
and in this period, various rocks have undergone long-term consolidation of geostatic stress and tectonic stress; therefore,
under in-situ conditions, their density and modulus of deformation are relatively high. Due to its fragmentary nature, once
being exposed to the earth’s surface, the structure of weak rock zone will soon be loosened, its density will be reduced,
and its modulus of deformation will also be reduced significantly. Generally, weak rock zone can be found in large construction
projects, especially in the dam foundation rocks of hydropower stations. These rocks cannot be eliminated completely by excavation.
Furthermore, all tests nowadays are carried out after the exposure of weak rock zone, modulus of deformation under in-situ
conditions cannot be revealed. In this paper, a test method explored by the authors has been introduced. This method is a
whole multilayered medium deformation method. It is unnecessary to eliminate the relatively complete rocks covering on weak
rock zone. A theoretical formula to obtain the modulus of deformation in various mediums has also been introduced. On-site
comparative trials and indoor deformation modulus tests under equivalent density conditions have been carried out. We adopted
several methods for the prediction researches of the deformation modulus of weak rock zone under in-situ conditions, and revealed
a fact that under in-situ conditions, the deformation modulus of weak rock zone are several times higher than the test results
obtained after the exposure. In a perspective of geological engineering, the research findings have fundamentally changed
peoples’ concepts on the deformation modulus of weak rock zone, provided important theories and methods for precise definition
of deformation modulus of deep weak rock zone under cap rock conditions, as well as for reasonable engineering applications. 相似文献
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以某火山岩体围岩隧道为研究对象,分析了隧道区蓄水构造类型与隧道涌水特征,运用多种解析方法和数值模拟方法对隧道区典型断层带涌水量进行了计算,并与实测数据进行了对比,总结出各种方法的适用性。研究结果表明:火山岩体围岩隧道涌水表现为断层带控水的分段涌水特征;传统的地下水动力学法较降雨入渗法和氚同位素法更适合于用于此类隧道的隧道涌水量计算,而数值模拟法在计算隧道涌水量上有一定的优越性。此外,隧道断层带水文地质调查的程度与参数刻画的准确度对计算结果精度影响很大。 相似文献
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《山地科学学报》2020,17(7):1790-1806
This study deals with the comparative investigation on various classification/characterization systems for sedimentary rocks in two parts, 40 kmlong of the Zagros tunnel, west of Iran. The results of extensive geotechnical explorations and field measurements were applied to obtain the rock mass classification/characterization systems such as Rock Mass Rating(RMR), Rock Condition Rating(RCR), Q-system(Q), Rock Mass Number(QN), Rock Mass index(RMi), Rock Structure Rating(RSR), and Geological Strength Index(GSI) for a wide range of sedimentary rocks. A set of systems inter-relationship is proposed. Some of these correlation relations such as RMR-Q, RMR-RMi, RMi-Q, RCR, GSI-GSI(Cai) are similar to the one or more relations proposed in the previous studies, however, some of them such as RSR-RMR, RSR-Q, RCR-QN and GSI-RMR are not similar to the previous works. Joint set orientation and joint set number are more important parameters that cause weak correlation coefficients where both side classifications are not similar in considering them in calculating values. So it is proposed to find relations between any pairs of systems that both of them consider or not consider these parameters. The relations are proposed for a wide range of sedimentary rocks and can be applied for similar geological environments. 相似文献
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近年来的1：5万区域地质调查成果表明，发育于胶南造山带日照地区的变质岩系，为一套以变质变形的侵入体为主，其中含有不同地质年代地层包体的变质杂岩。笔者等通过区域对比，将这套变质岩系中的变质地层厘定为胶东芝群及荆山岩群。胶东岩群仅出露苗家岩组，岩性单一，分布零星。荆山岩群发育相对较齐全，有野头岩组及陡崖岩组，主要岩石组合为黑云变粒岩、透辉透间变粒岩、石墨透辉变粒岩、富黑云变粒岩、黑云（二云）片岩、线粒岩、大理岩、石英岩、斜长角闪岩及石榴蓝晶片岩等，其原岩为一套浅海相泥砂质碎屑岩、泥岩夹火山岩、碳酸盐岩的沉积建造。日照地区荆山岩群与胶北地区的荆山群具有大致相同的岩石组合、原岩建造及大地构造环境。取自其陡崖岩组中变质岩石的错石U－Pb年龄为2146．8Ma和2279．2Ma，其时代应属古元古代。 相似文献