田中英,张茂省,冯立,孙萍萍,于锋丹.基于综合物探的黄土滑坡优势通道探测[J].西北地质,2019,52(2):172-180
基于综合物探的黄土滑坡优势通道探测
Preferential Passage Detection of Loess Landslide Based on Integrated Geophysical Exploration
投稿时间:2019-01-16  修订日期:2019-04-29
DOI:10.19751/j.cnki.61-1149/p.2019.02.018
中文关键词:  优势通道;综合物探;精细化探测;高密度电法;探地雷达
英文关键词:preferential passage;integrated geophysical exploration;fine detection;high-density resistivity method;ground penetrating radar
基金项目:重点研发项目(2018YFC1504700),国家自然科学基金重点项目(41530640、41731289),中国地质调查局项目(DD20189270、DD20160261、DD20189220)联合资助
作者单位
田中英 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
张茂省 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
冯立 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
孙萍萍 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
于锋丹 中国地质调查局西安地质调查中心/西北地质科技创新中心, 自然资源部黄土地质灾害重点实验室, 陕西 西安 710054 
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中文摘要:
      黄土区域优势通道的发育,改变了降雨及灌溉水的径流和入渗过程,降低了土体强度,造成斜坡失稳易发崩塌、滑坡等地质灾害。针对黑方台DH2#滑坡体及后缘,总结了优势通道的物性特征,选用优势通道非侵入式研究方法,开展了基于地球物理方法的优势通道精细化探测方法有效性研究。该研究在人为浇水漫灌干预的基础上,采用小点距的高密度电法(0.20 m)和探地雷达(0.02 m)初步查明了微型裂隙(宽度为0.2~0.5 cm)、滑坡后缘裂缝及滑动面等优势通道的发育展布特征,实现了黄土微小裂隙等优势通道精细刻画,证明了精细物探应用的有效性。同时,论述了在灌溉水入渗和冲蚀、黄土蠕动及滑动等综合作用下,微型裂隙逐渐发育为裂缝,进而形成滑动面的转化关系,为黄土优势入渗及滑坡研究提供研究基础。该技术在黄土地区的地裂缝、微型断裂探测等城市地质问题中具有较大的应用前景。
英文摘要:
      Regional preferential passages are developed in loess area, which have changed the runoff and infiltration process of rainfall and irrigation water, reduced the soil strength, and caused geological disasters such as slope instability and collapse and landslide. After studying the trailing edge and landslide body of DH2# in Heifangtai, the physical characteristics of preferential passage have been summarized in this paper, and the non-invasive research method has been used to study the effectiveness of the preferential passage refinement detection method based on geophysical method. Based on the intervention of artificial watering and flooding, the high-density resistivity (0.20m) and ground penetrating radar (0.02m) with small distance has been used to identify the development and distribution characteristics of micro-cracks (width 0.2-0.5m),cracks in the trailing edge of the landslide and the sliding surface. And the fine detection of preferential passage such as the micro-crack of the loess has been realized, which proves the effectiveness of fine geophysical application. At the same time, under the combined effects from the infiltration and erosion of irrigation water and the creep and sliding of loess, the micro-cracks gradually develop into cracks, which form the transformation relationship of sliding surface, and provide research basis for the loess preferential flow and landslide study. This technology has great application prospects in urban geological problems, such as ground fissures and micro-fracture detection in the loess area.
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