GROUND SETTLEMENT IN SIMI VALLEY FOLLOWING THE NORTHRIDGE EARTHQUAKE
GROUND SETTLEMENT IN SIMI VALLEY FOLLOWING THE NORTHRIDGE EARTHQUAKE
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北岭地震后西米谷的地面沉降
DOI：
10.1061/(asce)1090-0241(1998)124:1(80
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发表时间：
1998
影响因子：
3.9
通讯作者：
R. D. Hryciw
中科院分区：
文献类型：
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作者：
Ali H. Abdel;R. D. Hryciw
在加利福尼亚州西米谷东部的一个平坦的、未开发的、一般为粉质但高度分层的冲积场地上观察到了显著的差异沉降，由于1994年北岭地震的地面震动观测到的沉降是由于地下水位以下的土壤液化和地下水位以上松散土壤的干燥震动造成的。附近的强震记录站提供了高度可靠的地面运动数据进行分析。进行了广泛的锥贯入试验（CPT）沿着偶尔的地震锥（SCPT）、平板渗透仪试验（DMT）和土壤取样。采用先前开发的方法将CPT数据转换为等效标准贯入试验击数（SPT-N）值，以确定液化潜力和预测沉降。对CPT数据进行现场特定校准，以建立CPT读数与细粉百分比之间的相关性。预测的地面沉降轮廓与地震后不久发生的地裂缝的位置和沿地裂缝沿着观察到的差异沉降非常吻合。
Significant differential settlements were observed on a flat, undeveloped, generally silty but highly stratified alluvial site in eastern Simi Valley, Calif., due to groundshaking from the 1994 Northridge earthquake. The observed settlements were due to both liquefaction of soil beneath the ground water table and dry shaking of loose soils above it. A nearby strong motion recording station provided highly reliable ground motion data for analysis. Extensive cone penetration tests (CPT) along with occasional seismic cones (SCPT), flat plate dilatometer tests (DMT), and soil sampling were performed. Previously developed methods were adopted for converting the CPT data to equivalent Standard Penetration Test blow count (SPT-N) values for establishing liquefaction potential and predicting settlement. Site specific calibration of CPT data was performed to establish a correlation between CPT readings and the percentage of fines. Contours of predicted ground settlement agreed very well with the location and the observed differential settlements along a ground fissure that developed shortly after the earthquake.