【摘要】：本文通過天水市北山野外調查和室內分析相結合的方法,開展基于Newmark累積位移法的地震黃土滑坡危險性分析。分析了研究區(qū)的孕災背景,結合現(xiàn)有滑坡和不穩(wěn)定斜坡的調查數(shù)據(jù),在充分考慮了震源方位角和斜坡坡向角的角度關系基礎上,對優(yōu)勢坡向角和劣勢坡向角下的斜坡易發(fā)性進行分析計算,然后用回歸方程求出PGA為0.3 g時斜坡的累積位移,最后計算出斜坡在地震荷載下的失穩(wěn)概率。在此基礎上,對北山進行地震黃土滑坡的危險性評價。分析結果表明:在Newmark模型的地震黃土滑坡危險性評估中引入斜坡坡向角和震源方位角關系,有利于提高小區(qū)域(大比例尺)風險評估的準確性。
[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).
【作者單位】： 中國地質科學院地質力學研究所;重慶交通大學河海學院;中國地質大學(北京)工程技術學院;中國地質大學(北京)地球科學與資源學院;
【基金】：中國地質調查局地質調查項目“西秦嶺北緣斷裂帶天水段地震地質災害調查評價”項目(12120114035601)
【分類號】：P642.22

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