摘要
在系统分析持续堆积层滑坡位移与降雨变化规律及其相互作用关系的基础上,运用弹塑性理论与损伤力学的基本原理,提出以持续降雨增载量作为滑坡的加载动力参数,以相应滑坡位移速率或位移加速度变化作为稳定性位移响应量参数的方法,以此建立和确定降雨动力增载位移响应比评价参数与预测模型;此外,运用损伤力学的损伤变量参数与动力增载位移响应比参数的定量关系,建立该类滑坡的位移稳定性判据。并以新滩滑坡为例,运用该降雨动力增载位移响应比模型对其位移失稳规律进行深入的研究,重点对该滑坡的关键变形部位监测点的持续降雨增载过程与位移响应特征与规律进行系统分析与评价,发现监测点的动力增载位移响应比时序曲线均在滑坡失稳前发生突变,且突变时间与滑坡实际失稳时间基本相吻合。研究表明,降雨动力增载位移响应比是该类滑坡一种有效的位移动力监测评价参数,可运用该参数对降雨型堆积层滑坡进行稳定性评价与预测预报。
On the basis of systematic analysis of the change rule of displacement and rainfall and their interaction relations,this article first proposes that the increment of rainfall and displacement velocity or acceleration can be respectively taken as loading dynamic parameter and displacement response parameter,so as to establish the displacement response ratio of dynamics increment evaluation parameter and its prediction model by means of elastic-plastic theory and damage mechanics. In addition,according to the quantitative relation between the damage variable parameter of damage mechanics and the displacement response ratio of dynamics increment,the dynamic displacement destabilized criterion for this kind landslide is established. Finally,taking the typical colluvial landslide induced by rainfall in the Three Gorges Reservoir Area as an example,the continuous rainfall increasing process and its displacement response characteristics are analyzed and evaluated systematically by means of the displacement response ratio of dynamics increment model and find that the values of displacement response ratio of dynamics increment have an abrupt jump just before landslide took place,which demonstrates that the abrupt jump time agrees with the destabilized time of the landslide. The research results show that the displacement response ratio of dynamics increment is an effective dynamics displacement appraisal parameter of rainfall,so it can be used in the prediction of the landslide induced by rainfall.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4204-4215,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(41372297)
高等学校博士学科点专项科研基金项目(20113721110002)
山东省自然科学基金资助项目(ZR2011DL002)
关键词
边坡工程
降雨诱发型堆积层滑坡
动力增载位移响应比
评价模型
稳定性判据
新滩滑坡
slope engineering
colluvial landslide induced by rainfall
displacement response ratio of dynamics increment
evaluation model
stability criterion
Xintan landslide
