本文關鍵詞： 黃土滑坡 降水 誘發(fā)作用 影響分析 甘肅隴西　出處：《冰川凍土》2017年03期 　論文類型：期刊論文

【摘要】：以現場調查、試驗測試數據為依據,從降水(主要指大暴雨或連陰雨)改變地形地貌促使滑坡形成、改變滑坡土的成分構成、改變滑坡的土體結構及穩(wěn)定性、改變滑坡土的力學強度4個方面闡述了對黃土滑坡的誘發(fā)作用。選擇典型城市的系列降水資料及發(fā)生滑坡數量,從多年降水、年內降水過程及降水的空間變化3個方面闡述了對黃土滑坡的時空影響。年際上,同一區(qū)域滑坡發(fā)生的頻次與多年降水過程呈現良好的相關性,存在豐水年發(fā)生滑坡次數多、規(guī)模大而枯水年發(fā)生滑坡次數少、規(guī)模小的規(guī)律,豐水年發(fā)生滑坡數量一般是枯水年的3~5倍、平水年的1~2倍;年內滑坡集中出現于6-9月份和2-3月份,占全年滑坡數量的80%以上;不同區(qū)域,年降水量及降水強度越大,黃土滑坡發(fā)生頻率越高,規(guī)模也越大;自東南向西北,隨著降水量及降水強度的遞減,依次劃分為黃土滑坡強發(fā)育區(qū)、較強發(fā)育區(qū)和一般發(fā)育區(qū)。
[Abstract]:Based on the field investigation and test data, changing the topography and geomorphology from precipitation (mainly heavy rain or continuous rain) promotes the formation of landslide, changes the composition of landslide soil, and changes the structure and stability of landslide soil. The paper expounds the inducing effect of changing the mechanical strength of landslide soil on loess landslide and selects the series precipitation data of typical cities and the number of landslides. The temporal and spatial effects on loess landslide are discussed in three aspects: precipitation process and precipitation spatial variation. The frequency of landslide occurrence in the same region is well correlated with the precipitation process in the same region. There is a rule that the number of landslides occurs in the high water year is more than that in the dry year, the number of landslides in the year of high water is 3 5 times that in the dry year, and the number of landslides in the year of low water is 1 / 2 times of that in the year of low water. Landslides occurred mainly in June-September and 2-3 months, accounting for more than 80% of the total number of landslides in the whole year. In different regions, the higher the annual precipitation and rainfall intensity, the higher the frequency and scale of loess landslide. From southeast to northwest, with the decrease of precipitation and rainfall intensity, the loess landslide is divided into three regions: the strong developed area, the stronger developed area and the general developing area.
【作者單位】： 甘肅省地礦局第二地質礦產勘查院;甘肅省地質礦產勘查開發(fā)局;甘肅省科學院地質自然災害防治研究所;
【基金】：甘肅省國土廳黃土滑坡地質災害研究項目(20150021) 甘肅省科學院應用研發(fā)項目(2014JK-05)資助
【分類號】：P642.22
【正文快照】： 0引言降水引發(fā)的黃土滑坡因其發(fā)生率高、危害大、分布廣,一直是國內外前沿研究對象。大量的研究表明,絕大多數黃土滑坡與大氣降水以及由此形成的地下水(泉水)、地表徑流有著緊密的聯系,學術界一直存在“無水不滑”之說[1]。戴福初[2]、嚴紹軍等[3]、寧社教等[4]從土體的應力應

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