摘要
泥石流是山区沟谷的主要地质灾害类型之一,对其开展研究是很有价值的,但目前对其进行的针对性研究很少。本文重点研究山区沟谷泥石流形成的机理和力学条件。根据地形地貌、气候环境条件与土质学原理,研究了山区河流泥石流的形成机理及影响因素。河流两岸山坡岩土结构、人为活动与持续降雨或暴雨是山区河流泥石流形成的主要影响因素,不同土质结构与组成的土层的滑移破坏机理也不相同。山区河流泥石流的物源可概化为粘性土块体与松散砂砾两种典型固相物质。基于剪切破坏理论,建立了粘性土块的失稳滑动平衡条件;基于动量理论与重力分解原理,提出了松散砂砾启动的力学计算公式和失稳条件。
Investigation on debris flow is very worthy,as the debris flow is a main secondary disaster in a mountain channel,but the published works are still scarce.This study focused on the mechanism and mechanic conditions on debris flow formation in a mountain channel.Based on the conditions of land forms,climatic environment,and soil science principle,the mechanism and influencing factors on forming a debris flow in a mountain channel were investi-gation.The main influencing factors included the structure of rock and soil in bank slopes,human activities and sus-tained rainfall or storm rainfall.The mechanisms of sliding destroy of different soils with different structures and mat-ters were also different.The mass forming debris flow was divided into two types,i.e.,clay soil block and loose sand.According to the theory of shear failure,an equilibrium condition on slip of the clay soil block was suggested.According to the momentum theory and gravity analyzing method,a calculate formula to evaluate the enable and fail-ure of the loose sand was presented.
出处
《中国地质灾害与防治学报》
CSCD
2010年第3期57-60,72,共5页
The Chinese Journal of Geological Hazard and Control
基金
重庆市自然科学基金重点项目(CSTC
2009BA6001)
中国博士后科学基金特别资助项目(200902284)
关键词
山区河流
泥石流
机理
力学条件
mountain channel
debris flow
mechanism
mechanic condition
