姑咱台压应变异常信号与汶川和芦山等地震的关系研究     

张凌空  牛安福 《大地测量与地球动力学》2020,40(3):317-322

对2007~2014年姑咱台应变仪第一分量的分钟值原始观测曲线进行研究。结果表明,其日、月异常合计幅值、频次和时间均在汶川地震前显著增加,日、月累加值曲线相应快速上升,2008年以后速率明显放缓,前后相差最大可达10倍、9倍和4倍,与汶川地震表现出较强的对应关系。但之后发生芦山和康定地震时,这一过程并未重现。根据龙门山一带地应力实地测量结果和视应力分析结果,对该现象进行一定程度的解释。  相似文献   

井下地震计信号方位角硬件校正方案设计     

周云耀  王鹏辉  王海斌  吕永清 《大地测量与地球动力学》2020,40(11):1200-1205

设计一种井下地震计信号方位角校正方案,直接对地震计的输出进行校正,使数据采集器记录到的数据即为仪器方位角符合要求时的信号。基于MATLAB程序的Simulink仿真工具箱计算结果表明,本文方案可应用于校正井下地震计方位角偏差,具有较高的可行性。  相似文献   

非开挖技术中定向钻进效果与弯曲问题分析   总被引：3，自引：0，他引：3  

胡郁乐  乌效鸣 《地质与勘探》2003,39(2):85-87

非开相中的导(定)向技术巳成为非开挖技术中不可缺少的重要组成部分。由于一般导向设备具有体积庞大的特点，对于窄小拥挤的巷道明显不适应，因此传统定向钻进中的简单孔口定向方法显得尤为重要，而且这种方法不论从设备还是技术人力资源上我国都有较好的基础。但在非开挖中如何运用简单孔口定向方法要求设计及施钻人员必须对钻孔的守曲特点有较深入的了解，并要求要一定的施工经验。作对定向钻进中的一般规律进行了总结；在实践中运用这些规律取得了较好的效果。  相似文献   

High-resolution shallow seismic and ground penetrating radar investigations revealing the evolution of the Uemachi Fault system, Osaka, Japan     

Mohamed Rashed  Koichi Nakagawa 《Island Arc》2004,13(1):144-156

Abstract Ground penetrating radar (GPR) and high‐resolution shallow reflection seismic surveying were carried out to investigate the subsurface geology in and around the Uemachi Fault zone in the Yamato River area, Osaka, Japan. Shallow drilling in the area showed a major displacement event during the middle Pleistocene. The main Uemachi Fault plane could be clearly imaged on the seismic section, except for the most shallow 200 m. Several shallow normal fault planes with less displacement could be detected on both sides of the fault plane. GPR profiles confirmed the presence of several shallow normal faults within the area near the fault zone. These shallow faults could be followed in all of the GPR profiles crossing the fault zone. The integration of seismic section, GPR profiles and drilling data led to a conceptual model that explains the evolution of the Uemachi Fault system. The proposed model suggests the occurrence of several cycles of small vertical displacement along the deep part of the fault plane caused by the regional east–west compressional stress. The ductile nature of the shallow sedimentary cover and the absence of confining pressure in the shallow part allow for a considerable amount of plastic bending before failing in the shallow sedimentary layers. This bending generates stretching force within the shallow sedimentary cover, which in time, along with gravitational force, gives rise to the formation of the swarm of normal faults within the shallow layers near the fault zone. Some of the detected faults extend to a depth of less than 3 m below the ground surface, suggesting that the last tectonic activity along the fault plane may have occurred recently.  相似文献   

Study on relationship between features of strain anomaly obtained by borehole strain meter at Wushi station in Xinjiang and strong earthquake: Taking Jiashi MS = 6.8 earthquake as an example   总被引：1，自引：0，他引：1  

蒋靖祥  尹光华  王在华  李川 《地震学报(英文版)》2004,17(Z1)

Introduction According to the Seismograph Network of China, an earthquake of MS=6.8 occurred at10:03:42 on February 24, 2003 in Jiashi county, Xinjiang (39.55°N, 77.15°E) with the focal depthof 25.2 km. The macroseismic epicenter located at the boundary of Bachu and Jiashi counties,Xinjiang Uygur Autonomous Region. 248 persons died and 4 853 ones were injured (2 058 ofthem were heavily injured) in the earthquake. 49 656 households (about 205 079 persons) losttheir houses. The Dis…  相似文献   

高精度钻孔超声波成像原理及解释技术   总被引：1，自引：0，他引：1  

胡平  孔广胜  余钦范 《物探与化探》2004,28(4):310-313

介绍了钻孔超声波成像的工作原理。由于该系统具有图像分辨率高、方位确定准确的特点,特别适合于确定岩石节理(或岩层)的走向、倾向、倾角,裂隙和破碎发育情况。可根据工程的需要,提供多种综合分析图件,为大型工程的地基基础的地质结构分析、评价提供可靠依据,在香港开展的工程中使用了钻孔超声波成像,取得较好效果。  相似文献   

淮南矿业集团丁集煤矿风井预注浆工程施工工艺     

温丙初王忠民  韩成彬 《中国煤田地质》2004,16(5):43-44,57

淮南矿业集团丁集煤矿风井井筒区地层软、硬互层频繁,岩层倾角23°左右,可钻性差,为防止钻孔施工中发生偏斜,采用了满眼钻具组合和主、副支点扶正器的钻进方法,达到了终孔井底落点允许最大偏斜率5‰,固管段允许最大偏斜率2‰要求,保证了地面预注浆工程的质量。  相似文献   

Study on Measurement Methods of Multi-Directional Waves—Wave Gauge Array Method   总被引：1，自引：0，他引：1  

Yu Yuxiu Liu Shuxue Prof 《中国海洋工程》1992,(2)

- Measuring multi-directional waves with the wave gauge array is one of the fundamental and easily realised methods. In this paper, the wave gauge array is described and the effects of the gauge spacing, the array orientations, etc. of the three array arrangements, i. e., linear array, T-type array and pentagon array, on the resolution of the directional spreading of waves, are investigated experimentally. This study can be used as a reference in the experimental study and the field measurement of directional waves.  相似文献   

海浪方向谱的现场观测与分析   总被引：3，自引：0，他引：3  

俞聿修  柳淑学 《海洋工程》1994,(2)

方向谱是海浪的基本性质之一。本文在国内首次采用测波仪阵列法在渤海采油平台上成功地观测到海浪方向谱，给出了当地随波浪成长而变化的方向谱表达式。观测前采用数模和模型试验方法，对阵列的布置型式、测波仪间距和平台等对观测结果的影响，以及现有各种方向谱分析方法的精度等进行了对比分析，为提高观测精度，保证方向谱分析的质量提供了依据。  相似文献   

井中与钻孔岩芯磁化率测量效果的对比分析          下载免费PDF全文

李水平 《地质找矿论丛》2018,33(2):282-285

为了解岩(矿)石磁化率测定法(磁化率仪)在反映钻孔中岩层磁性变化规律方面的效果,对同一钻孔分别运用岩(矿)石磁化率测定法和井中磁化率测量法进行了对比分析研究。结果表明,岩(矿)石磁化率仪测定法具有成本低、速度快、灵敏度高等特点,可以作为井中磁化率测量的一部分,起到井中磁化率测量在准确确定矿层厚度、位置、矿层品位等方面的作用,避免测井设备的笨重所带来的麻烦,特别是能够弥补井中磁化率测量在有套管存在井段的严重数据不足之缺陷。  相似文献