蠕滑滑坡滑带土强度及其参数特性试验研究
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摘要
金坪子滑坡Ⅱ区为一巨型蠕滑滑坡,为了研究该滑坡在诱发因素影响下的强度变化规律,以滑坡Ⅱ区滑带土为研究对象,通过不同剪切速率、不同含水率和正应力下的环剪试验,研究了其强度特性,结果表明:滑带土应变软化现象明显,已达到稳定残余状态的滑带土随着剪切速率的改变其抗剪强度出现增大的现象,并且正应力越大,强度恢复的幅度越大,其原因可能是剪切速率的改变使其剪切模式发生了变化;峰值强度参数中黏聚力、内摩擦角均随含水率的增大而线性减小,但黏聚力的变化幅度比内摩擦角的大,残余黏聚力与含水率成负相关关系,残余内摩擦角变化很小。
The Jinpingzi landslide is an old landslide to the arch dam of Wudongde Hydropower Station in the downstream direction on the right bank of Jinsha River. The displacement monitoring data shows that the landslide zone II presents an overall creep slip with a non-constant rate. In order to study the rule of strength change of landslide slip zone, its active zone Ⅱwas studied. A series of ring shear tests under different shear rates, moisture content and normal pressure was employed. Its strength characteristics were studied. It could provide reference for the protection and management of similar landslides. It is found that the phenomenon of sliding soil strain softening is obvious. The strength of the sliding zone increases with the change of shear rate and the greater the positive stress, the greater the magnitude of strength recovery. The reason may be that the shear rate changes its shear mode. The cohesion and internal friction angle of the peak strength parameters decrease linearly with the increase of moisture content and the change range of cohesion is greater than the internal friction angle. Residual cohesion is negatively correlated with moisture content and the residual internal friction angle has little change.
The Jinpingzi landslide is an old landslide to the arch dam of Wudongde Hydropower Station in the downstream direction on the right bank of Jinsha River. The displacement monitoring data shows that the landslide zone II presents an overall creep slip with a non-constant rate. In order to study the rule of strength change of landslide slip zone, its active zone Ⅱwas studied. A series of ring shear tests under different shear rates, moisture content and normal pressure was employed. Its strength characteristics were studied. It could provide reference for the protection and management of similar landslides. It is found that the phenomenon of sliding soil strain softening is obvious. The strength of the sliding zone increases with the change of shear rate and the greater the positive stress, the greater the magnitude of strength recovery. The reason may be that the shear rate changes its shear mode. The cohesion and internal friction angle of the peak strength parameters decrease linearly with the increase of moisture content and the change range of cohesion is greater than the internal friction angle. Residual cohesion is negatively correlated with moisture content and the residual internal friction angle has little change.
引文
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[2] 卢书强,易庆林,易武,等.三峡库区树坪滑坡变形失稳机制分析[J].岩土力学,2014,35(4):1123-1130.
[3] 黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):433-454.
[4] 缪海波,殷坤龙,张修旺.间歇复活型库岸老滑坡地表位移预测[J].地质科技情报,2016,35(5):208-213.
[5] WANG Lunan,YAN Echuan,HUANG Xiaoming,et al.Positive Rate Effecton Residual Strength of Slip Soils[J].Electronic Journal of Geotechnical Engineering,2016,21(18):5975-5985.
[6] WANG G,SUEMINE A,SCHULZ W H.Shear-Rate-Dependent Strength Control on the Dynamics of Rainfall-Triggered Landslides,Tokushima Prefecture,Japan[J].Earth Surface Processes & Landforms,2010,35(4):407-416.
[7] 蒋秀姿,文宝萍.缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究[J].岩土力学,2015,36(2):495-501.
[8] 缪海波,殷坤龙,王功辉.库岸深层老滑坡间歇性复活的动力学机制研究[J].岩土力学,2016,37(9):2645-2653.
[9] 任光明,聂德新.大型滑坡滑带土结构强度再生特征及其机理探讨[J].水文地质工程地质,1997,24(3):28-31.
[10] 黄志全,张长存,姜彤,等.滑坡预报的协同-分岔模型及其应用[J].岩石力学与工程学报,2002,21(4):498-501.
[11] 黄志全,李小慧,孙怡,等.魏家沟滑坡滑带土非饱和蠕变特性试验研究[J].华北水利水电大学学报(自然科学版),2015,36(1):47-50.
[12] 蒋树,王义锋,唐川,等.金沙江下游金坪子Ⅱ区低速滑坡活动机理初探[J].工程地质学报,2017,25(6):1547-1556.
[13] CARRUBBA P,FABBRO M D.Laboratory Investigation on Reactivated Residual Strength[J].Journal of Geotechnical & Geo-Environmental Engineering,2008,134(3):302-315.
[14] 张晓丽,周进,黄志全,等.黏粒含量对磁县段膨胀土抗剪强度影响的试验研究[J].工程地质学报,2016,24(1):109-115.
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