摘要
以实验数据为依据,通过数值模拟对台风暴雨条件下滑坡体稳定性的主要影响因素进行模拟研究。台风暴雨条件下滑坡体的主要影响因素为特殊降雨雨型:(1)在相同雨强程度下,台风暴雨的单峰型降雨水文响应速度、稳定性破坏速度及程度均大于普通均匀型降雨,单峰型降雨导致边坡短时间内达到失稳状态,呈"即雨即滑"情况;(2)强台风多峰型降雨下,经过第一个峰值强降雨后浅层土质边坡已处于不稳定状态,当第二个强峰值降雨来临时,坡体的稳定性较单峰型降低更为迅速。这些为福建省台风暴雨这一特殊降雨类型条件下滑坡的发生机理探索及预警预报提供了新的思路和科学依据。
Based on experimental data and numerical simulation, the paper studied the major factor affecting landslide stability under typhoon rainstorm condition. The result shows that the main factor is its special rainfall pattern ： （ 1 ） With equal rainfall intensity, hydrologic response velocity and the rate of stability disruption of the unimodal rainfall are greater than those of even rainfall. The uni- modal rainfall could destabilize the slope in a short time, leading to synchronous rainstorm with landslide. （2） In strong typhoon-multimodal rainfall pattern, the shallow soil slope has been destabilized after the first rainfall extremum, therefore, its stability will be decreased much faster than that of unimodal rainfall when the second rainfall extremum arrives. The study provides new reference and scientific basis to the occurrence mechanism and hazards prediction of landslide under the typhoon rainstorm in Fujian Province.
出处
《地质学刊》
CAS
2017年第2期297-304,共8页
Journal of Geology
基金
国土资源大调查项目"闽东南地区台风暴雨型地质灾害监测预警示范"(1212010740906)
关键词
台风暴雨
滑坡
稳定性
影响因素
福建
typhoon rainstorm
landslide
stability
influencing factor
Fujian
