本文關鍵詞：大光包滑坡工程地質研究，由筆耕文化傳播整理發(fā)布。

大光包滑坡工程地質研究

ENGINEERING GEOLOGICAL STUDY ON DAGUANGBAO LANDSLIDE

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HUANG Runqiu,ZHANG Weifeng,PEI Xiangjun （State Key Laboratory of Geohazard Prevention and Geoenvironment Protection（ Chengdu University of Technology）, Chengdu 610059）

地質災害防治與地質環(huán)境保護國家重點實驗室(成都理工大學),成都610059

文章摘要：大光包滑坡是5·12汶川MS 8.0級特大地震觸發(fā)的規(guī)模最大的滑坡�；挛挥阢氪ǖ卣鸢l(fā)震斷裂上盤，距發(fā)震斷裂直線距離3.0～4.5km，覆蓋面積7.12km2，體積11.59×108m3，是我國有史料記載以來規(guī)模最大的滑坡，也是目前世界上已知為數不多的幾個10×109m3以上的超大規(guī)�；轮�。本文作者自2011以來，在過去工作基礎上，對該滑坡開展了1！2000滑坡工程地質測繪，結合物探、坑槽探及淺孔鉆探等工作，編制了滑坡工程地質系列圖件，從而進一步查明了大光包滑坡的平面和空間形態(tài)、滑體結構、滑面位置和堆積特征等，獲得了較為完整的滑坡要素定量數據。研究成果還原了大光包滑坡發(fā)生時的真實場景；揭示了滑坡堆積地貌特征、植被分布、巖性分布以及堆積體結構特征等，認為大光包滑坡是受強震和特定地形條件、巖體結構條件（層間剪切斷層和兩組陡裂結構面）控制的“楔形體”失穩(wěn)。在此基礎上，根據滑坡的要素組成和運動堆積特征，，對滑坡進行了分區(qū)，分為滑坡斷壁區(qū)、主滑堆積區(qū)和次滑堆積區(qū)3個大區(qū)，進一步劃分為10個小區(qū)，分析闡明了各區(qū)特征。最后，對大光包滑坡的發(fā)生過程和形成機理進行了概要分析，將其概括為5個主要階段：即強震拉裂階段、鎖固段剪斷及“楔形體”失穩(wěn)階段、高速滑動和“急剎車”運動堆積階段、拆離滑動階段、斷壁崩滑階段。研究還發(fā)現：強震作用下滑帶的進一步碎裂化，以及可能出現的水擊作用可能是滑坡驟然啟動的主要原因。

Abstr：Daguangbao landslide with an area of 7.12km2 and a volume of 1.159 billion m3 is the largest landslide triggered by the Wenchuan MS8.0 Earthquake occurred on May 12th,2008,and also is the largest one in China and one of the few giant landslides more than one billion m3 in the world.It is located in the hanging wall of the seismogenic fault of the Wenchuan earthquake,and 3.0~4.5km away from it.The authors＇ team has conducted a engineering geological survey including mapping,geophysical exploration,pitting and boreholes with a scale of 1!2000 since 2011.According to the data,we finished a series of geological maps including a comprehensive plane map and 25 sections.The spatial shape of the landslide,pre- and post-failure structures,slip surface and its characteristics were further investigated and a set of quantitative data about Daguangbao landslide features was obtained.We found it was a huge“wedge”failure with a strike slipping sliding along a bedded shear fault. According to the description of witnesses and structures of the accumulation,we rebuilt the experience of the slope failure and sliding process during the strong quaking.Basically,it can be divided into five stages：shattering-tensile cracking,cutting through of the front locking section,“suddenly braking”and napping motion,detaching sliding on both sides of the accumulation and finally secondary sliding of the scarp cliff.The accumulation can be divided into three area and ten sub-areas.They are the main scarp area,the accumulation area,and the back depression area, which corresponding to three,four and three sub-areas respectively.

文章關鍵詞：

Keyword：:Daguangbao landslide Engineering geological mapping Engineering geological zonation Formation mechanism Wedge failure

課題項目：地質災害防治與地質環(huán)境保護國家重點實驗室團隊課題（SKLGP20122001）,國家自然科學基金重點項目（編號：41130745）資助.

作者信息：會員可見

  本文關鍵詞：大光包滑坡工程地質研究，由筆耕文化傳播整理發(fā)布。