地质通报2026，Vol.45Issue(7)：1284-1298,15.DOI:10.12097/gbc.2024.11.061
西藏茶曲高位冰岩崩软弱带弱化特征与灾害链风险研究
Weakening characteristics of weak zones and disaster chain risk of high-altitude ice-rock avalanches in Chaqu,Xizang
摘要
Abstract
[Objective]Under the influence of global warming and a humidifying climate,the frequency of the rock-ice avalanche disaster is steadily increasing.Among these,the occurrence of ice-rock avalanches is primarily controlled by ice-rock mixtures at the contact zones between glaciers and bedrock.However,the weakening characteristics of ice-rock mixtures and the formation processes of the ice-rock avalanche-debris flow disaster chain remain unclear.[Methods]This study focuses on the Chaqu Basin of the Qinghai-Xizang Plateau.Temperature-controlled triaxial experiments were conducted to investigate the failure characteristics of ice-rock mixtures under conditions of-8～0℃,ice-rock ratios of 0.25～0.75,and confining pressures of 200～400 kPa.Additionally,the motion patterns of the Chaqu BC01 high-altitude ice-rock avalanche hazard under-4℃ conditions were analyzed using Massflow simulations.[Results]The results indicate that the peak shear strength,internal friction angle,and cohesion of ice-rock mixtures decrease with increasing temperature.As temperature rises,the strength variation of ice-rock mixtures transitions from strain softening and shear failure to strain hardening and dilatancy failure.With an increasing ice-rock ratio,the stress-strain characteristics of the mixtures shift from strain softening to strain hardening.Using the Mohr-Coulomb strength criterion and Boltzmann function,the relationships among strength,ice-rock ratio,and temperature were characterized,and a strength failure criterion incorporating temperature and ice-rock ratio parameters was established.[Conclusions]Under extreme weather conditions,the Chaqu ice-rock avalanche is prone to forming an ice-rock avalanche-debris flow-river blockage disaster chain,which could obstruct the Palongzangbu River,posing significant threats to residents and infrastructure in the Palongzangbu River Basin.关键词
气候变化/冰岩崩灾害链/冰岩混合物/温控三轴/数值模拟/西藏Key words
climate change/ice-rock avalanche disaster chain/ice-rock mixtures/temperature-controlled triaxial testing/numerical simulation/Xizang分类
天文与地球科学引用本文复制引用
赵文博,郭长宝,吴瑞安,曹世超,常文斌,袁浩..西藏茶曲高位冰岩崩软弱带弱化特征与灾害链风险研究[J].地质通报,2026,45(7):1284-1298,15.基金项目
中国地质调查局项目《全国重大工程地质安全风险区划与综合评价》(编号:DD20221816)和中国地质科学院基本科研业务费专项经费资助《青藏高原东缘大型深层滑坡蠕滑—启滑早期识别模型与动力学机制研究》(编号:JKYZD202410) Supported by China Geological Survey Project(No.DD20221816)and Basic Scientific Research Special Fund of the Chinese Academy of Geological Sciences(No.JKYZD202410) （编号:DD20221816）
