基于Newmark模型的天水市北山地震黄土滑坡危险性评价
发布时间：2018-11-18 10:44
【摘要】：本文通过天水市北山野外调查和室内分析相结合的方法,开展基于Newmark累积位移法的地震黄土滑坡危险性分析。分析了研究区的孕灾背景,结合现有滑坡和不稳定斜坡的调查数据,在充分考虑了震源方位角和斜坡坡向角的角度关系基础上,对优势坡向角和劣势坡向角下的斜坡易发性进行分析计算,然后用回归方程求出PGA为0.3 g时斜坡的累积位移,最后计算出斜坡在地震荷载下的失稳概率。在此基础上,对北山进行地震黄土滑坡的危险性评价。分析结果表明:在Newmark模型的地震黄土滑坡危险性评估中引入斜坡坡向角和震源方位角关系,有利于提高小区域(大比例尺)风险评估的准确性。
[Abstract]:Based on the method of field investigation and indoor analysis in Beishan, Tianshui City, the risk analysis of seismic loess landslide based on Newmark cumulative displacement method is carried out in this paper. In this paper, the disaster background in the study area is analyzed. Based on the existing survey data of landslide and unstable slope, the angle relationship between the source azimuth angle and slope direction angle is fully considered. The susceptibility of slopes at dominant and inferior slope angles is analyzed and calculated. Then the cumulative displacement of slopes with PGA of 0. 3g is calculated by regression equation. Finally, the probability of slope instability under earthquake load is calculated. On this basis, the risk assessment of seismic loess landslide in Beishan is carried out. The results show that the relationship between slope direction angle and seismic source azimuth is introduced into the risk assessment of seismic loess landslide based on Newmark model, which is helpful to improve the accuracy of risk assessment in small area (large scale).
【作者单位】： 中国地质科学院地质力学研究所;重庆交通大学河海学院;中国地质大学(北京)工程技术学院;中国地质大学(北京)地球科学与资源学院;
【基金】：中国地质调查局地质调查项目“西秦岭北缘断裂带天水段地震地质灾害调查评价”项目(12120114035601)
【分类号】：P642.22
[Abstract]:Based on the method of field investigation and indoor analysis in Beishan, Tianshui City, the risk analysis of seismic loess landslide based on Newmark cumulative displacement method is carried out in this paper. In this paper, the disaster background in the study area is analyzed. Based on the existing survey data of landslide and unstable slope, the angle relationship between the source azimuth angle and slope direction angle is fully considered. The susceptibility of slopes at dominant and inferior slope angles is analyzed and calculated. Then the cumulative displacement of slopes with PGA of 0. 3g is calculated by regression equation. Finally, the probability of slope instability under earthquake load is calculated. On this basis, the risk assessment of seismic loess landslide in Beishan is carried out. The results show that the relationship between slope direction angle and seismic source azimuth is introduced into the risk assessment of seismic loess landslide based on Newmark model, which is helpful to improve the accuracy of risk assessment in small area (large scale).
【作者单位】： 中国地质科学院地质力学研究所;重庆交通大学河海学院;中国地质大学(北京)工程技术学院;中国地质大学(北京)地球科学与资源学院;
【基金】：中国地质调查局地质调查项目“西秦岭北缘断裂带天水段地震地质灾害调查评价”项目(12120114035601)
【分类号】：P642.22
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