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泥石流是我国常见的一种地质灾害之一,特别是低频泥石流往往给山区经济建设和人们的生命财产安全带来重大威胁.通过对西南山区7条典型低频泥石流沟的现场调查,测量粗化层块石3个方向的尺寸,得到西南山区低频泥石流粗化层块石粒径的特征值:长轴、中间轴和短轴方向长度平均值分别为52,36,21 cm.其中长轴方向大于50 cm的块石数量百分比集中在36%~58%之间,平均值为50%,线密度在0.43~1.10个/m之间,平均值为0.84个/m.这些特征值的确定为西南山区典型低频泥石流早期识别体系的建立提供了基础资料.
Debris flow is one of the common geological disasters in our country, especially the low-frequency debris flow often brings great threat to the economic construction and people’s life and property safety in mountainous area.Through the field survey of seven typical low-frequency debris flow ditch in the southwest mountainous area, The size of rock block in three directions, the characteristic value of rock particle diameter of low frequency debris flow layer in the southwestern mountainous area is obtained: the average length of the long axis, the middle axis and the short axis are respectively 52, 36 and 21 cm, and the long axis direction is greater than The percentage of stone mass at 50 cm was between 36% and 58% with an average of 50% and the linear density was between 0.43 and 1.10 / m with an average of 0.84 / m. These eigenvalues were determined as southwestern The establishment of a typical low-frequency debris flow early identification system in mountainous area provides the basic information.