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排序方式: 共有151条查询结果,搜索用时 15 毫秒
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Results obtained by SASW and PS-logging (in-hole) seismic techniques are compared with the relatively new ReMi (Refraction microtremor) method at a common site with a well-known soil profile: a recently constructed high-speed railway embankment. PS-logging is the most accurate technique in identifying the soil profile of the embankment followed by Re-Mi and SASW. Mean shear wave velocity estimations are also higher for PS-logging, followed by SASW and ReMi, while mean deviation is similar in each technique. The ReMi technique has provided very accurate results in the study of the embankment profile, which in addition to its high operability and its fast data processing, makes it a very convenient technique for extensive geotechnical surveys. 相似文献
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提出一种基于支持向量机的岩质边坡稳定性预测方法。该方法地很好的表达了岩质边坡稳定性与其影响因素之间的非线性映射关系,并应用该方法建立了相应的模型。预测结果表明,利用该方法进行岩质边坡稳定性预测是可行的、有效的。 相似文献
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针对柴里煤矿374①综放工作面坚硬顶板初次放顶难的问题,采取了强制放顶措施,同时进行矿压观测,了解初次放顶过程中矿压显现规律,采取有效安全措施,减少初次放顶带来的危害。 相似文献
27.
Stuart Crampin David C. Booth Maria A. Krasnova Evgenie M. Chesnokov Alexandr B. Maximov Nikolai T. Tarasov 《Geophysical Journal International》1986,84(2):401-412
Summary. Three-component seismograms of small local earthquakes recorded in the Peter the First Range of mountains near Garm, Tadzhikistan SSR, display shear-wave splitting similar to that previously observed near the North Anatolian Fault in Turkey. The Peter the First Range is in a region of compressional tectonics, whereas the North Anatolian Fault is a comparatively simple strike-slip fault. Detailed analysis of the Turkish records suggests that the splitting is diagnostic of crack-induced anisotropy caused by vertical microcracks aligned parallel to the direction of maximum compression. Preliminary examination of paper records from Garm shows that most shear waves arriving within the shear-wave window display shear-wave splitting, and that the polarizations of leading shear-waves are consistently aligned in a NE/SW direction. The area is complicated and the tectonics are not well-understood, but the NE/SW direction is approximately perpendicular to the compressional axis in many of the fault-plane mechanisms of the earthquakes. These earthquakes are usually at depths between 5 and 12 km, although there are some deeper events nearby.
Parallel shear-wave polarizations, such as those observed, are expected to indicate the strike of nearly vertical parallel microcracks, which would be aligned parallel to the direction of maximum compression. Thus the shear-wave polarizations in the Peter the First Range indicate that the directions of principal stress are reversed in the rock above the earthquake foci where thrust faulting is taking place. 相似文献
Parallel shear-wave polarizations, such as those observed, are expected to indicate the strike of nearly vertical parallel microcracks, which would be aligned parallel to the direction of maximum compression. Thus the shear-wave polarizations in the Peter the First Range indicate that the directions of principal stress are reversed in the rock above the earthquake foci where thrust faulting is taking place. 相似文献
28.
雷宛 《地球科学与环境学报》1988,(2)
“隐蔽层”用浅层初至波记录不到,而有“隐蔽层”存在时,在折射解释中常常产生两种误差。确定“隐蔽层”的厚度,是工程物探、工程地质和工程地震学中的一个重要问题。本文给出了确定两种“隐蔽层”厚度的pc—1500程序,简便实用。 相似文献
29.
阿尔金断裂带西端地震近纬向迁移特征的研究 总被引:1,自引:0,他引:1
自1988年11月6日云南澜沧—耿马发生7.6级地震以来,我国大陆地区已有3年半未发生Ms≥7.0级地震。另外,自1991年2月25日新疆柯坪发生6.5地震以来,上述地区已有15个月未发生Ms≥6.0级地震。多数学者认为,6级地震长时间的缺失,意味着我国大陆地区7级地震的迫近。在这一活跃期内。下一个7级强震究竟发生在何处? 相似文献
30.
X. Ribeyre L. Hallo V. T. Tikhonchuk S. Bouquet J. Sanz 《Astrophysics and Space Science》2007,307(1-3):169-172
The Rayleigh-Taylor instability (RTI) plays an important role in the dynamics of several astronomical objects, in particular,
in the supernovae (SN) evolution. In the present paper we examine the dynamics of a shell (representing a type II SN remnant)
blown-up by a wind emitted by a central pulsar. The shell is accelerated by the pulsar wind and its inner surface experiences
the RTI. We develop an analytical approach by using a specific transformation into the coordinate frame co-moving with the
SN ejecta. We first derive a non-stationary spherically symmetric solution describing an expansion of a gas shell under the
pressure of a central source (pulsar). Then, we analyze its 3D stability with respect to a small perturbation on the inner
shell surface. The dispersion relation is derived in the co-moving reference frame. The growth rate of the perturbation is
found and its temporal evolution is discussed. We compare our result with the previous published studies and apply it to the
Crab nebula evolution. 相似文献