摘要
冻土区斜坡稳定性是青藏高原工程建设必须面对和解决的问题之一 .介绍了青藏高原多年冻土区斜坡失稳的主要类型 ,包括崩塌型、蠕变型、泥流阶地型、表土植被层蠕滑型及热融滑塌型等 .其中热融滑塌型对于高原环境、尤其是植被及工程的危害最为显著 ,该类斜坡的诱发因素一般为工程开挖或工程活动对冻土的热扰动 ,斜坡失稳的根本原因在于多年冻土融化后强度的减弱或丧失 .在分析了热融滑塌型滑坡失稳机理的基础上 ,提出了滑坡治理的原则与工程措施方案建议 .
The area of permafrost is 150×10\+4 km\+2 km~ 2 on the Tibetan Plateau. Slope instability in permafrost regions is somewhat neglected, and there are few reports on sliding case histories of slope failure in permafrost on the plateau. As the research and evaluate methods for slopes in thawed regions can not simply applied to permafrost regions, it is necessary to pay much attention to slope instability in engineering constructions, such as the Qinghai-Tibetan Railway, which has been claimed to be constructed as a environment conservation project. In fact, to the maintenance of the Qinghai-Tibetan Highway, researchers have pointed out that landslide hazards are very important to engineering activities.\;Instability of frozen soil slopes in permafrost regions is very important to engineering constructions on the plateau. Based on the achievements that have been obtained, in the paper the main types of landslide in permafrost regions of the plateau are introduced. They include collapse, creep slope, debris flow induced terrace, vegetation layer creeping slope and thawing debris flow. Among them, the last one is most hazardous to environment, vegetation and engineering projects. Landslide of thermal\|thawing debris flow is due to excavation, and the natural mechanism of slide is soil strength decreasing or even disappearing when in the case of thawing. Finally, engineering treatment methods for thermal\|thawing debris flow are proposed based on its sliding mechanism.
出处
《冰川冻土》
CSCD
北大核心
2002年第5期608-613,共6页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目 (5 0 0 0 80 16)
中国科学院"西部之光"项目
中国科学院知识创新工程重大项目 (KZCX1 SW 0 4)资助
