摘要
SVTK水电站区域地层主要为中生代侏罗纪近水平~缓倾状分布的砂质岩和泥质岩呈不等厚互层状和新生代基性喷出岩,构造活动轻微,中生代地层未遭受强烈的挤压作用。在砂岩、相对完整的泥质岩中划分出顺岩层面分布泥化夹层、软化带及挤压带,呈可塑状泥质,其物理力学性质与硬质岩存在较大差异。软、硬不等厚分布的岩质边坡最常见的失稳模式有塑流-拉裂崩塌和塑流-滑坡两种模式,边坡支护重点在于有效控制边坡软质岩进一步软化后导致后缘裂隙扩张、降低坡体内孔隙水压力,尤其注意软弱层与卸荷裂隙贯通形成整体滑动失稳。
The geological strata in SVTK hydropower station area are mainly composed of sandstone and mudstone distributed in a nearly horizontal to gently dipping manner during the Mesozoic Jurassic period,with uneven thickness interbedded and Cenozoic basic extrusive rocks.The tectonic activity is mild,and the Mesozoic strata have not experienced strong compression.In sandstone and relatively intact mudstone,mudstone interlayers,softening zones,and compression zones are distributed along the rock layers,presenting a plastic mudstone with significant differences in physical and mechanical properties compared to hard rocks.The most common instability modes of rock slopes with uneven thickness distribution of soft and hard are plastic flow tensile collapse and plastic flow landslide.The key to slope support is to effectively control the expansion of the trailing edge cracks and reduce the pore water pressure inside the slope after further softening of the soft rock,especially paying attention to the connection between the weak layer and the unloading cracks to form an overall sliding instability.
作者
易琦
李兵
李飞
YI Qi;LI Bing;LI Fei(Power China Kunming Engineering Corporation Limited,Kunming 650051,China)
出处
《云南水力发电》
2025年第12期29-32,共4页
Yunnan Water Power
关键词
软硬相间
边坡工程
塑流
破坏模式
soft and hard alternation
slope engineering
plastic flow
destruction mode
