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1.
龙门山北端青川断层附近应力测量与断层稳定性   总被引:8,自引:8,他引:2  
汶川8.0级地震后,余震是否沿青川断裂向汉中方向发展,是否还会发生强烈余震成为社会关注的问题。为了查明汶川8.0级地震后青川断层库仑应力的变化,判明余震的发展趋势,2008年6月2日~28日我们在青川断裂中段阳平关一带开展了断层附近原地应力测量研究,在3个钻孔中分别用水压致裂法和解除法得到了断层上下盘构造应力的大小、方向和分布特征。根据实测的地应力资料,断层附近最大水平主压应力方向为NE-NEE向,与区域构造应力SN-NNE向主压应力方向有一些差异,说明受断层活动影响,断层附近的应力状态与区域应力场已经发生了改变。青川断层是一条逆冲兼右行走滑的活动断裂,在汶川大地震中虽未见其活动,但其阻隔了余震向北发展,表明该断层是一条重要的边界断层,既是区域构造分区的界线,也是区域应力场的分区标志线。利用地应力实测资料研究了断层的活动性,在测量深度域内水平和铅直应力的关系为σH〉σh〉σv,该应力状态有利于逆断层活动,与地质资料反映的以逆断层活动及近期在断层附近发生的地质异常现象一致。利用库仑摩擦滑动准则,摩擦强度取0.6-1.0进行分析,断层附近的现今地应力状态接近产生逆断层摩擦滑动的临界值,其中断裂东段发生逆断层活动的可能性较小,相比而言,青川断裂带西段危险性更大。  相似文献
2.
In order to examine whether the anelastic strain recovery (ASR) method can be applied for determining the in situ stress in hard rocks at great depths, the anelastic strain recovery of oriented cores was measured in six independent directions. The core specimens were taken from four depths within the range of about 2400–4500 m MD at the METI Niitsu well in Japan; the rock materials were mudstone, dolerite, basalt and andesite. For all the rocks the expansional anelastic strains were obtained, the magnitude of the strains in various directions continuously measured for 1 or 2 weeks was of the order of 1000 × 10− 6 in mudstone; in contrast, strains of the other cores did not exceed a few hundred microstrains. These strains were used for a three-dimensional analysis of the principal in situ stresses. At the third depth, the principal stress directions were considered to be affected by fractures pre-existing near the core, and showed the features of a very local stress state. With the exception of this data, the directions determined by the ASR method were in agreement with those determined using other in situ measurement methods. Based on two assumptions, i.e., (i) the rock stress in vertical direction is equal to density-related gravitational overburden stress, (ii) the ratio of anelastic strain recovery compliance of shear deformation mode and the compliance of volumetric deformation mode is equal to 2, the values of the three principal stresses were estimated. The values of the minimum principal stress in the plane perpendicular to the well axis determined in this study were in agreement with those determined based on extended leak-off tests (ELOT or XLOT) conducted at the same well. Therefore, it can be said that the ASR method is well suited for use in directly determining the directions of principal in situ stresses in three dimensions and in estimating the magnitude of the stresses in isotropic rocks at great depths, such as those encountered when drilling deep into a submarine seismogenic zone.  相似文献
3.
地应力与巷道布置关系的理论研究   总被引:4,自引:0,他引:4  
初始地应力是地下工程围岩稳定与支护结构设计的一个基本参数。介绍了地应力计算原理 ,并根据矿井实测地应力资料 ,分析了初始地应力场与巷道布置及巷道破坏形式的关系。为今后选择巷道掘进方向和改进巷道支护方案提供了依据。  相似文献
4.
汶川地震断裂带科学钻一号孔ASR法地应力测量   总被引:2,自引:1,他引:1       下载免费PDF全文
大地震后发震断裂附近的应力状态是认识和理解地震机理的重要参数.5.12汶川地震后,我国开展了基于地震机理研究的汶川地震断裂带科学钻探项目(Wenchuan Earthquake Fault Scientific Drilling Project,简称WFSD),为研究震后龙门山断裂带附近深部应力状态提供了条件.本文主要介绍适合深部应力测量的非弹性应变恢复法(Anelastic strain recovery method,简称ASR法)的测试设备和流程,并利用ASR法对WFSD-1号钻孔岩心进行了原地应力测量,取得了该钻孔424~1173 m深度范围内7个岩心样品的非弹性应变恢复实测数据,并根据成像测井对岩心进行了定向,确定了原地应力方向,估算了原地应力的大小.WFSD-1钻孔最大主应力的方位为NW69°~NW35°,主应力的大小随深度的增加而增大.  相似文献
5.
山西盆地现今地应力状态与地震危险性分析   总被引:2,自引:0,他引:2       下载免费PDF全文
在山西盆地南北两端4个地区共计13个深钻孔中进行了水压致裂地应力测量, 获得了现今地应力的大小、方向和分布规律。在盆地北端五台山、雁门关地区400~600 m深度内, 实测最大水平主应力值为8~12 MPa。而南端临汾、运城地区则具有较高的构造应力, 在400~500 m深度内实测最大水平主应力值为20~28 Mpa。地应力“南高北低”比较明显。运用这些实测的地应力资料, 根据库仑摩擦滑动准则, 对研究区内断裂的稳定性进行了力学分析。分析结果表明, 总体来看, 目前五台山、雁门关和临汾地区的水平主应力都未达到断层活动的临界值; 运城地区已接近断层活动临界值的下限, 若计入孔隙压力的影响因素, 运城地区最大水平主应力已达到逆断层活动的临界值。从地应力的角度分析认为该区发生地震的潜在危险性较大, 这一现象值得关注和研究。  相似文献
6.
针对铝土矿床突水,开展地应力测量研究,是分析查明突水成因、优化确定防治方案及合理进行矿床底板管理的一项重要手段。夹沟矿床测量分析结果表明:①矿床地区存在较高的水平构造应力,其量值明显高于垂向应力。矿床水平高构造应力对矿床底板及其边坡稳定性具有不良影响,矿床开采掘面轴线走向应沿N70°E方向布设趋佳;②由于持续开采作用,矿床附近地应力状态产生不良扰动,水平高构造应力同开采形成的局部地应力场不良改变的叠加影响对矿床底板岩石场各类裂隙、结构面水起到极为重要的“催化”作用,是造成矿床底板突水的重要因素之一;③防治工作应重视加强矿床底板管理,科学预留安全隔水层屏障。并建议对矿床底板及其下伏一定范围内的灰岩实施预注浆处理,使得裂隙得以加固、溶洞得到堵塞,以抵抗不良应力的作用,消除或减弱对矿床突水的影响。  相似文献
7.
高地应力围岩分区碎裂化的时间效应分析和相关参数研究   总被引:2,自引:0,他引:2  
本文阐述了高地应力围岩分区碎裂化现象的形成需要经过一定的时间,但这段时间不会很长;采用蠕变理论对岩石分区碎裂化的时间效应进行了分析;推导了能够描述加速蠕变阶段的流变模型一改进的西原模型的本构方程和蠕变方程,在此基础上求出了岩石分区碎裂化发生时破裂带半径(破碎带距巷道中心的距离)的公式。  相似文献
8.
固体地壳的应力状态是地壳的最重要的性质之一。地壳表面和内部发生的各种构造现象及其伴生的各种地质灾害都与地壳应力的作用密切相关。地应力测量与监测不仅为深入认识地震的孕育和发生机制, 进而为强震预测提供重要的科学依据, 而且也是地球动力学基础研究的重要组成部分, 此外, 还将为国家重大工程建设, 如深埋隧道、水电工程、深部能源开采、核废料处置场地的选址等深部地下工程的勘测设计提供重要的技术支撑。 地应力测量与监测技术实验研究是国家科技专项“深部探测技术试验研究”所属的第六项目。该项目的主要任务是, 围绕专项的总体科学目标, 开展系统的地应力测量与监测及其实验对比研究, 通过室内实验和野外现场实际测试, 对现有各种主要的地应力测试技术的适用性和可靠性进行总体评价和研究, 进而针对存在的问题开展研究和相关测试系统的创新性研发, 从整体上提升现有主要地应力测试方法的技术水平; 在北京地区建立深孔地应力综合观测试验站; 在青藏高原东南缘开展地应力测量与监测, 构建地应力监测网络, 进而将其打造成具有国际影响力的地球动力学野外试验基地。  相似文献
9.
This paper describes a new procedure for assessing the ratio between in situ stresses in rock masses by means of K (K = σH / σv, being σH and σv principal stress) and tectonics for purposes of engineering geology and rock mechanics. The method combines the use of the logic decision tree and the empirical relationship between the Tectonic Stress Index, TSI, and a series of K in situ values obtained from an extensive database. The decision tree considers geological and geophysical factors affecting stress magnitudes both on the regional and local scale. The TSI index is defined by geological and geomechanical parameters. The method proposed provides an assessment of the magnitude of horizontal stresses of tectonic origin. Results for several regions of Europe are presented and the possible applications of the procedure are discussed.  相似文献
10.
The onshore Georgina Basin in northern Australia is prospective for unconventional hydrocarbons; however, like many frontier basins, it is underexplored. A well-connected hydraulic fracture network has been shown to be essential for the extraction of resources from the tight reservoirs that categorise unconventional plays, as they allow for economic flows of fluid from the reservoir to the well. One of the fundamental scientific questions regarding hydraulic stimulation within the sub-surface of sedimentary basins is the degree to which local and regional tectonic stresses act as a primary control on fracture propagation. As such, an understanding of present-day stresses has become increasingly important to modern petroleum exploration and production, particularly when considering unconventional hydrocarbon reservoirs. This study characterises the regional stress regime in the Georgina Basin using existing well data. Wellbore geophysical logs, including electrical resistivity image logs, and well tests from 31 petroleum and stratigraphic wells have been used to derive stress magnitudes and constrain horizontal stress orientations. Borehole failure features interpreted from wellbore image and caliper logs yield a maximum horizontal stress orientation of 044°N. Integration of density log data results in a vertical stress gradient of 24.6 MPa km–1. Leak-off and mini-fracture tests suggest that this is the minimum principal stress, as leak-off values are generally shown to be at or above the magnitude of vertical stress. The maximum horizontal stress gradient is calculated to be in the range of 31.3–53.9 MPa km–1. As such, a compressional stress regime favouring reverse/reverse–strike-slip faulting is interpreted for the Georgina Basin.  相似文献
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