王家沟泥石流成因分析及基于GeoFlow-SPH的侵蚀性模拟

Analysis on the Causes of Wangjia Gully Debris Flow and Its Erosion Simulation Based on GeoFlow-SPH

甘肃岷县由于所处地质环境特殊,经常暴发泥石流灾害,严重威胁当地居民的生产和生活。为研究泥石流灾害的特征,以清水乡王家沟泥石流为详查对象,查明泥石流的致灾因素,现场实验和室内分析,王家沟泥石流以稀性为主,且泥石流平均速度为5.10 m/s,一次性冲出方量等于5.72×10^(4)m^(3)。通过泥石流模拟参数的计算,王家沟泥石流屈服应力、粘滞系数、侵蚀系数分别为2490.18 Pa、0.0738 Pa·s、0.00083 m^(-1)。结合数值模拟与现场调查发现:王家沟泥石流的侵蚀性与地形的陡峭、植被的稀少以及沟道两旁的土体稳定性有关。

Due to the special geological environment in Min County,Gansu Province,debris flow disasters often occur,which seriously threatens the production and life of local residents.In order to study the characteristics of debris flow disasters,the article takes Wangjia gully debris flow in Qingshui Township as a detailed investigation object to find out the disaster-causing factors of debris flow.Through field experiments and indoor analysis,Wangjia gully debris flow is mainly sparse,and the average velocity of debris flow is 5.10 m/s,and the amount of one-time flushing is equal to 5.72×10^(4)m^(3).Through the calculation of debris flow simulation parameters,the yield stress,viscosity coefficient and erosion coefficient of Wangjiagou debris flow are 2490.18 Pa,0.0738 Pa·s,and 0.00083 m^(-1),respectively.Combined with numerical simulation and field investigation,it is found that the erosivity of Wangjiagou debris flow is related to the steepness of the terrain,the scarcity of vegetation and the stability of the soil on both sides of the channel.