工程地质学报2024，Vol.32Issue(1)：170-182,13.DOI:10.13544/j.cnki.jeg.2022-0072
舟曲虎家崖滑坡直接转化泥石流的特征、过程与机理研究
CHARACTERISTICS,PROCESS AND MECHANISM OF THE HUJIAYA DEBRIS FLOW DIRECTLY FROM LANDSLIDE IN ZHOUQU COUNTY,CHINA
摘要
Abstract
The debris flow directly transformed from a landslide usually has a longer mobilization distance,wider impact,and more serious hazards than the landslide itself.However,there is limited research on the transformation mechanism and its influencing factors.On October 20,2020,a small debris flow occurred in Hujiaya,located on the left bank of the Bailong River in Zhouqu County,Gansu Province.It flowed onto S313 and threatened the adja-cent village.Based on field investigations,laboratory geotechnical tests,remote sensing interpretation,and rainfall analysis,this paper explores the geo-environmental conditions,mobilization,and accumulation characteristics of the Hujiaya debris flow.The main characteristics,processes,influencing factors,and formation mechanisms of a shallow landslide directly transforming into debris flow are studied.The future trend of Hujiaya debris flow is also discussed.It reveals that:(1)The loose materials,accumulated in the narrow-long channel of the upper reaches of the Hujiaya gully,were mobilized due to a long-duration rainfall of up to 19 days and a total of 98.5 mm,resulting in a slow-moving landslide.The damage to the slope structure caused by previous regional strong earthquakes also contributed to the landslide occurrence.(2)The back segment of the landslide and the sheared-out part of the front segment of the landslide were directly transformed into viscous debris flow during their movements.However,the middle segment of the landslide continued to slide.(3)The transformation process is greatly influenced by the soil saturation that sheared out at the front segment of the landslide,the steepness and height drop of the gully,and the ground runoff.(4)The rear edge of the Hujiaya gully may be damaged due to the progressive traction of the adja-cent Xieliupo landslide.Additionally,there are residual landslide masses and limestone avalanche masses in the channel upstream and the residual landslide mass on the right side of the outlet,which could mobilize due to future similar rainfall events and strong earthquakes,transforming into debris flow again and threatening the downward Hujiaya village and highway S313.关键词
慢速滑坡/长历时低强度降雨/黏性泥石流/转化机理/白龙江Key words
Slow-moving landslide/Long-duration rainfall/Viscous debris flow/Transforming mechanism/Bail-ong river分类
天文与地球科学引用本文复制引用
马许平,曾庆利,廖立业,杜琳琳,张路青..舟曲虎家崖滑坡直接转化泥石流的特征、过程与机理研究[J].工程地质学报,2024,32(1):170-182,13.基金项目
国家自然科学基金项目(资助号:41772382,42071020),第2次青藏高原综合科学考察研究项目(资助号:2019QZKK0904).This research is supported by the National Natural Science Foundation of China(Grant Nos.41772382,42071020)and The Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2019QZKK0904). （资助号:41772382,42071020）
