共查询到19条相似文献，搜索用时 23 毫秒
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用声发射Ｋａｉｓｅｒ效应对陕甘宁盆地Ｇ地区埋藏深度１４００－１７００ｍ的工组储层进行了地应力和地层条件下的岩石力学性质测试,从而获得了该地区延长组储层天然三维应力及水平主应力方向。在此基础上,根据地层条件下岩石泊松比计算了该区的现今构造应力,最大构造应力（ＮＥ方向）的平均值在８．１ＭＰａ左右,在中国西北地区属正常范围。 相似文献
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时间对大理岩凯塞效应的影响 总被引：2，自引：0，他引：2
岩石的凯塞效应具有记忆历史最大应力和应变的能力,但时隔两月对大理岩样品进行再加载试验表明,尽管大理岩仍有凯塞效应出现,但凯塞效应记忆先前应力和先前应变的准确程度不高。笔者认为岩石声发射产生的原因在于其内部存在的裂纹,岩石凯塞效应的机理则在于对其先前损伤的记忆。按照笔者确定的损伤因子,凯塞效应具有记忆先前损伤的能力,时隔两个月对大理岩样品进行再加载试验,凯塞效应记忆先前损伤的准确程度仅损失3%。文章从时间因素证明了凯塞效应的机理在于对先前损伤的记忆。 相似文献
3.
岩石单轴压缩试验Kaiser效应实质的研究 总被引：5，自引：0，他引：5
岩石 Kaiser效应具有记忆先前应力、纵向应变和横向应变的能力 ,记忆的准确程度随加载阶段不同而不同。为了解 Kaiser效应的记忆实质 ,通过岩石单轴压缩试验确定 Kaiser效应对体积应变、弹性模量和泊松比三项物性参数的记忆能力。结果表明 ,岩石 Kaiser效应具有记忆先前物性参数的能力 ,其中尤以对弹性模量的记忆能力表现为最好 ,而且受时间因素影响不大 ,说明岩石 Kaiser效应的实质是对其内部物理特性的记忆 相似文献
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陆相咸化湖泊沉积硫酸盐岩硫同位素组成及其地质意义 总被引：1，自引：0，他引：1
现代海洋中的硫酸盐矿物和海水硫酸盐本身常有相似的硫同位素组成,因而可根据现代蒸发岩的硫酸盐同位素来判断古环境。据李任伟［１］引用Ｈｏｌｓｅｒ和Ｋａｐｌａｎ及格里年科的资料报道,海相蒸发岩及其所反映的古海洋硫酸盐的硫同位素组成只在较狭窄的范围内变化,现... 相似文献
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《中国地质大学学报(英文版)》1998,(3)
Ｎｏ．４Ｂａｓｉｃｔｅｃｈｎｏｌｏｇｙａｎｄｄｅｖｅｌｏｐｍｅｎｔｏｆｇｅｏｇｒａｐｈｉｃｉｎｆｏｒｍａｔｉｏｎｓｙｓｔｅｍ．ＷｕＸｉｎｃａｉ．（４）：３２９－３３３．Ｔｈｉｓｐａｐｅｒａｎａｌｙｚｅｓｔｈｅｂａｓｉｃｃｏｎｃｅｐｔａｎｄｒｅｓｅａｒ... 相似文献
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Ｊｉａｏｄｏｎｇ Ｇｒａｎｉｔｏｉｄｓ ａｎｄ Ｇｏｌｄ Ｍｉｎｅｒａｌｉｚａｔｉｏｎ￥ＣｈｅｎＧｕａｎｇｙｕａｎ；ＳｕｎＤａｉｓｈｅｎｇ；ＳｈａｏＹｕｅ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙａｎｄＭｉｎｅｒａｌＲｅｓｏｕｒｃｅｓ，ＣｈｉｎａＵｎｉ... 相似文献
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太湖西山岛中更新世柏山组的发现邹松梅，周钢军，朱佰万，聂新坤江苏省地产矿产调查研究所，南京，２１１１３５关键词：地层，孢粉，柏山组，中更新世，江苏太湖ＴｈｅＤｉｓｃｏｖｅｒｙｏｆＭｉｄｄｌｅＰｌｅｉｓｔｏｃｅｎｅＢａｉｓｈａｎｆｍｉｎＸｉｓｈａｎＩｓ... 相似文献
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建立古地温曲线的理想地质温压计 总被引：5，自引：0，他引：5
古地温曲线是岩石圈在特定地质时期热结构的集中体现。采用矿物地质温压计是建立古地温曲线的基本途径。对比研究发现，适于建立古地温曲线的温压计有Ｂｒｅｙ和Ｋｏｈｌｅｒ（１９９０）、Ｂｅｒｔｒａｎｄ和Ｍｅｒｃｉｅｒ（１９８５）的二辉石温度计，Ｅｌｉｓ和Ｇｒｅｅｎ（１９７９）、Ｋｒｏｇｈ（１９８８）、Ｂｅｒｍａｎ等（１９９５）的石榴石单斜辉石Ｆｅ２＋—Ｍｇ交换反应温度计，Ｎｉｃｋｅｌ和Ｇｒｅｅｎ（１９８５）、Ｂｒｅｙ和Ｋｏｈｌｅｒ（１９９０）的石榴石斜方辉石Ａｌ压力计，以及Ｐｕｔｒｉｋａ等（１９９６）的单斜辉石玄武质熔体平衡温压计 相似文献
9.
Gong Zaisheng China National Offshore Oil Corporation Beijing Yang Jiaming Institute of Petroleum Exploration Development China National Offshore Oil Corporation Gaobeidian Hu Jianwu Hao Fang Faculty of Earth Resources 《中国地质大学学报(英文版)》2001,12(2)
Ｏｖｅｒｐｒｅｓｓｕｒｅｈａｓｂｅｅｎｆｏｕｎｄｉｎａｂｏｕｔ 180ｓｅｄｉｍｅｎｔａｒｙｂａｓｉｎｓ(ＬａｗａｎｄＳｐｅｎｃｅｒ,1998;Ｈｕｎｔ,1990 ) .Ｔｈｅｍｅｃｈａｎｉｓｍｓｆｏｒｔｈｅｏｖｅｒｐｒｅｓｓｕｒｅｄｇｅｎｅｒａｔｉｏｎａｎｄｔｈｅｆｌｕｉｄｆｌｏｗａｃｔｉｖｉｔｉｅｓｉｎｏｖｅｒｐｒｅｓ ｓｕｒｅｄｂａｓｉｎｓｈａｖｅｂｅｅｎｔｈｅｓｕｂｊｅｃｔｓｏｆａｎｕｍｂｅｒｏｆｓｔｕｄｉｅｓ (Ｈｕｎｔ,1996 ;Ｏｒｔｏｌｅｖａ ,1994) .Ｐｒｏｂａｂｌｙ ,ｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔａｓｐ… 相似文献
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时间延迟对劈裂试验条件下岩石凯塞效应的影响 总被引：1，自引：0，他引：1
验证了粗晶花岗岩在劈裂试验条件下凯塞效应的存在性。进行了循环加卸载时间间隔分别为2、15d和45d时岩石的声发射试验,讨论了时间延迟对花岗岩凯塞效应的影响。研究结果表明,前期荷载越接近极限强度,岩石的凯塞效应越不明显;凯塞效应随再次加载时间延迟的增加而削弱,在对花岗岩的声发射试验中观察到15d以后岩石的凯塞效应仍然很显著,45d后凯塞效应基本消失。文中同时对试件与加载设备之间的接触状态对声发射试验结果的影响作了初步的定性分析。 相似文献
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Experimental verification of the Kaiser effect in rocks 总被引：10，自引：0，他引：10
Summary The Kaiser effect is a measure of damage developed in rock. It was investigated using 61 core specimens of eight types of rocks under uniaxial cyclic loading. The effects of the delay time between subsequent loading cycles and the holding time on the Kaiser effect were examined in granite specimens. The characteristics of AE occurring during unloading and holding were also studied. The experimental results showed that most of the rocks, with the exception of some iron ores, showed an obvious Kaiser effect before the load was very near the level of the strength. The delay and holding times did not strongly influence the Kaiser effect. Breakdown of the Kaiser effect was expressed by the felicity ratio that may be taken as a measure of the quality of rock. The onset of the continuously increasing AE in the first loading cycle can be taken as a measure of the damage in rock. The mechanism of the Kaiser effect was studied with the aid of a micromechanical model. An expression for the damage surface in the stress space was derived from the model. The theoretical expression was compared with the results of the Kaiser effect tests, which showed a satisfactory consistence. 相似文献
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利用定向岩心进行AE法原地应力测量 总被引：2，自引：0，他引：2
在北京市房山区迎风坡花岗闪长岩300m深钻孔中,采用以水泥端帽法为主的岩心定向技术,并在钻进和取心过程中采取特殊措施,在钻孔中距地表25m~301m整个深度段内取得了直径86mm的定向岩心。对深度294m的定向岩心进行了声发射Kaiser效应试验。岩石试件为圆柱形,直径30mm,高度75mm.在垂直方向,利用声发射Kaiser效应估计的垂直主应力为7.7MPa;在294m岩体静岩压力为7.9MPa;两者基本相同。在水平面内,对4个方向的试件进行声发射Kaiser效应试验,得到相应的各个方向的压应力,由此估算的水平最大和最小主应力分别为21.2MPa和12.1MPa.水平面内最大主应力的方向基本为SN方向。将声发射Kaiser效应测量结果与水压致裂法的测量结果进行对比,二者具有很好的一致性。 相似文献
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岩石声发射Kaiser点信号频带能量分布和分形特征研究 总被引：4，自引：2，他引：4
通过单轴加载岩石破坏全过程声发射试验,根据Kaiser效应原理采用参数法确定了Kaiser点.在此基础上,首先采用小波包频带分解方法,对岩石声发射Kaiser点信号的能量分布特征进行了研究,分析了砂岩声发射信号的不同频带能量分布规律,得到了Kaiser点特征频带能量百分比大于相邻点的重要结论.其次,采用G-P算法计算了声发射过程关联分维数,结果表明声发射过程不仅具有分形特征,而且Kaiser点声发射信号关联分维数小于其相邻点,其结论可作为通过波形分析识别Kaiser点的特征. 相似文献
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We present a new method by which the maximum previous stress in rocks can be estimated. The Kaiser effect in acoustic emission is often used for an estimation of the stress to which rocks have been subjected. However, there are cases in which the Kaiser effect is not clear. In such cases, estimation of the previous stress is difficult by the conventional method which is based on the acoustic emission activity during one stress cycle. Using a new method of cyclic loading, we can estimate the stress in cases where the conventional method does not work. In the new method, the difference of the acoustic emission activity between the first and second reloading begins to increase markedly at the previous maximum stress. Even if the Kaiser effect is not clear, we can estimate the previous stress by observation of this difference.Our new method may be applicable for estimating the crustal stress. In this paper, we study the influence of water and temperature under uniaxial compression, because rocks in the earth's crust are saturated and subjected to high temperatures and they are disturbed by water and temperature in the sampling process. The present experiment shows that the Kaiser effect is often masked by changes in water content and temperature. However, we can estimate the previous stress by the new method even after the rock has been disturbed by water and temperature. The accuracy in the stress estimation by this method is satisfactory for the ratio of the previously applied stress to the fracture strength of the rock less than 40%. 相似文献
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Summary Knowledge of in-situ stress in rock masses is essential for mining and civil engineering design and the Kaiser effect method
of stress determination provides an economical alternative to currently applied investigation techniques. A practical problem
associated with this method is the loss of the Kaiser effect over time during the process of anelastic strain recovery, but
a direct relationship is observed between anelastic strain recovery and the number of acoustic emissions. The behaviour is
modelled here using the Kelvin and Burger rheological models, for the stages of creep during uniaxial laboratory loading,
anelastic strain recovery and the loss of the Kaiser effect, with constants being calculated and compared for samples loaded
under geological and laboratory conditions. It is found that the loss of the KE at low stress levels compares directly with
the process of anelastic strain recovery and fits the Burger model over the time scales of interest. A difference between
primary and secondary (undercored samples) recovery is demonstrated with a slower recovery for primary relaxation and with
samples taken from geological stress environments recovering more slowly than those loaded under laboratory conditions, for
all stress levels tested. 相似文献
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准确确定Kaiser点是研究声发射测量地应力的关键.通过对模拟岩心的水泥块进行单轴受压破坏过程的声发射试验,得到了试件在试验过程中的应力-应变曲线、应力、声发射强度、声发射累积数与时间的关系图.分别对试样用突变点法、最大曲率法、双切线法、重加载法（抹录不尽现象、两次加载相减法）、多方面综合判定法以及声发射强度信号的统计分析法进行了分析.从不同的方面认识了试样的Kaiser点的特性,总结并分析了确定Kaiser点的方法以及各自的适应性,并进行了优选.研究表明,试验确定了试样的物理特性,各种方法都能从不同角度和机理上解释Kaiser点现象,综合判定法能相对更加全面、准确地确定Kaiser点. 相似文献