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881.
Detection of seepage paths in earth dams using self-potential and electrical resistivity methods 总被引:7,自引:0,他引:7
Earth and rockfill dams are designed to operate under steady state seepage. Anomalous seepage may be a threat to the integrity of the structure. In spite of advances made in the fields of geotechnical engineering, it is not possible to have 100% leak-proof structure. Any excessive and unplanned seepage may lead to the failure of the dam, especially in unconsolidated or fractured terrains. Geophysical methods play an important role in mapping seepage paths and monitoring the changes of the seepage with time, enabling to plan technically and economically worthwhile remedial measures. In the present paper, utilisation of electrical methods for delineation of seepage zones at two of the four Saddle dams of the Som-Kamla-Amba project, Rajasthan State, India; which is founded on heterogeneous rock mass, is discussed. Electrical resistivity method was used to delineate zones favourable for seepage, whereas, self-potential (SP) method was used to delineate the seepage paths. SP measurements have shown negative anomaly of the order of 10–20 mV in amplitude, indicating low seepage, coinciding with the seepage measurements made by the project authorities. 相似文献
882.
883.
884.
885.
Therelationshipsbetwenearthquakesandpositionsofthesunandmoon(Ⅱ)——Sometemporalcharacteristicsoftheaftershocksequencesofstronge... 相似文献
886.
The sources for thirteen deep focus earthquakes ofm
b≥5.5 andh>400 km in Northwest Pacific region were studied using waveform fitting and shear fracture source model. The source parameters
were obtained as follows: focal depth, faulting plane, slip direction, rupture velocity, rupture length, rupture direction
and scalar moment tensor. It was found that all these earthquake sources can be interpreted as shear faulting and have simple
source time functions. The strike direction of faulting plane for most deep focus earthquakes coincides with that of the subduction
zone, especially in the deep part of the subduction zone, it results in the tendency of reducing the dip angle of the subduction
zone. The multiple point source model was also used to study the source process. The waveform fitting is better than the shear
fracture model, but the general rupture direction which coincides with that from unilateral shear source model can not be
obtained from the multiple point source model.
This study is supported by the National Science Foundation of China and the Chinese Joint Seismological Science Foundation. 相似文献
887.
A total of 11 earthquakes with 15 Rayleigh wave paths, recorded at 11 broadband digital PASSCAL seismometers installed in
the Tibet Plateau by the Sino-U.S. joint research group, were used to determine the phase velocity and attenuation coefficient
of surface waves in periods of 10–130 s. The average shear wave velocity and quality factor {ie271-1} structures in the crust
and upper mantle were obtained in this region. The result shows the average {ie271-2} is low and there exists a high attenuation
({ie271-3}=93–141) layer in the crust. The depth range of the low {ie271-4} value layer (16–42 km) is consistent with the
range of low velocity layer (21–51 km) in the crust. Below 63 km in the lower crust, {ie271-5} decreases with depth from 114
to 34 at depth of 180 km. The low shear wave velocity and low value of {ie271-6} at the same depth range in the crust indicate
that the rocks in the range is probably melted or partially melted. According to the shear wave velocity structure, the average
thickness of the crust is about 71 km and a clear velocity discontiniuty appears at the depth of 51 km. The low-velocity zone
(4. 26 km/s) at depth of 96–180 km may be corresponding to the asthenosphere.
Contribution No. 96A0047, Institute of Geophysics, SSB, China.
This study was supported by the National Natural Science Foundation of China. 相似文献
888.
ObservationandresearchonULFandVLFseismo-electromagneticradiationJIA-ZHIYUAN(袁家治);KozoTakahashi;SHU-QINGQIAN(钱书清),YokioFujinaw... 相似文献
889.
Studyonthecharacteristicsofcrust┐mantletransitionzoneinWesternYunnanProvinceHONG-XIANGHU(胡鸿翔)ZHONG-YANGLIN(林中洋)YIN-JUBIAN(边银... 相似文献
890.
前汛期北江洪水过程水汽汇与河水流量的关系 总被引:4,自引:0,他引:4
本文分析了1980-1984年4-6月和1994年6月洪水过程北江流域的大气水汽汇特征及其与河水流量的关系。结果表明:前汛期洪水过程的前期大乞一般连续存在超过一定值的较强水汽汇,时间为1周左右,洪水的发生是强水汽汇连续产生的径流的积累所致;北江流域洪水期水汽汇的极大峰一般比石角站的洪峰流量超前2天左右,本文结果为洪水的预报提供一条新思路。 相似文献