融雪条件下碎裂松动岩体边坡渗流及稳定分析  

Study on Seepage and Stability Characteristics of Cataclastic and Relaxed Rock Mass Slope under the Snow Melting Condition

作　　者：王蒙 姜婷婷 WANG Meng;JIANG Tingting(PowerChina Guiyang Engineering Corporation Limited,Guiyang 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司

出　　处：《人民珠江》2019年第12期56-61,共6页Pearl River

基　　金：中国华能集团科技项目(HNKJ15-H13)

摘　　要：采用饱和-非饱和渗流理论,在考虑裂隙及融雪条件下,针对某电站碎裂松动岩体边坡进行不同融雪补给强度及时间下渗流的稳定分析,重点考察不同融雪强度及融雪时间对边坡饱和区影响规律,进而对边坡进行稳定分析。计算结果表明:①表层裂隙能明显增加融雪入渗效果,对边坡稳定不利;②入渗初期,碎裂岩体边坡中下部首先出现暂态饱和区,且随着入渗继续,饱和区不断扩大,上部尤为明显;③融雪入渗0~60 h整个过程中,边坡稳定安全系数呈先减小后增加的变化规律,最危险工况发生在第48 h,最小稳定安全系数为1.312,对应的融雪强度为100 mm/d;④融雪强度越大,水分入渗越多,坡内饱和区出现的时间越早,饱和区范围越大,对边坡稳定影响越大。研究成果较为合理地反映了融雪过程中及融雪停止后一段时间内碎裂岩体边坡渗流场变化规律,并定量评价了该过程碎裂岩体边坡稳定性,对碎裂岩体边坡治理对策具有一定参考价值。Based on the saturated-unsaturated seepage theory,and under the crack and snow melting conditions,this paper studies the seepage and stability of the cataclastic and relaxed rock mass slope in a hydroelectric power station under the different snow melting intensity and duration,with emphasis on the influence of different snow melting intensity and duration on the saturation zone of slope.The results show that:①The snow melting infiltration increases by the surface crack,which is bad for the slope stability.②Transient saturation zone appears in the middle and lower part of the slope in the early stage of seepage.As the infiltration continues,the saturation zone expands,especially in the upper part.③During the whole seepage process of 0~60 h,the stability safety factor of slope decreases first and then increases.The most dangerous condition occurs at 48 h,and the minimum stability safety factor is 1.312 with the snow melting intensity of 100 mm/d.④The greater the snow melting intensity is,the more water infiltrates,the earlier saturation zone in the slope appears,the larger the saturation zone forms,and the greater the impact on slope stability has.The research reflects the variation laws of the seepage field of the cataclastic and relaxed rock mass slope during and after the snow melting,and evaluates quantitatively the stability of the slope,which provide certain reference value for the control of cataclastic rock mass slope.

关 键 词：饱和非饱和渗流 碎裂松动岩体边坡 融雪入渗 稳定 

分 类 号：TU452[建筑科学—岩土工程]