花岗岩残积土非饱和特性及其边坡稳定性研究
引用文献：
黄俊光 范培彦 单毅 李伟科 李磊. 花岗岩残积土非饱和特性及其边坡稳定性研究[J]. 建筑结构，2022，48（24）：138-143.
HUANG Junguang FAN Peiyan SHAN Yi LI Weike LI Lei. Study on unsaturated characteristics of granite residual soil and its slope stability[J]. Building Structure，2022,48（24）：138-143.
摘要：降雨诱发滑坡是花岗岩残积土地区主要地质灾害之一。为研究花岗岩残积土边坡在强降雨条件下的响应，在广州市黄埔区选取了一典型非饱和花岗岩残积土边坡开展系列研究，包括现场雨量监测、固结不排水三轴试验、滤纸法试验。基于监测数据与试验结果，研究风化程度对抗剪强度及土-水特征曲线的影响规律，探究了当地不同降雨工况对现场边坡稳定的影响。结果表明，随着风化程度加剧花岗岩残积土有效抗剪强度指标均有不同程度的减小，其中，风化差异导致的有效内摩擦角变化幅度小于有效黏聚力变化幅度；风化程度差异也影响花岗岩残积土的非饱和水力特性；降雨强度与边坡安全系数的降幅呈正相关关系，而降雨历时与边坡安全系数的恢复速度呈负相关关系。该研究可为典型花岗岩残积土边坡相关工程的科学设计与灾变防控提供一定借鉴。
关键词：花岗岩残积土；三轴试验；滤纸法；强降雨；边坡稳定性；岩土风化；
基金：国家自然科学基金(52008121)；中国博士后科学基金(2020M682652)；住房和城乡建设部科学技术计划项目(2022-K-039)；广东省住房和城乡建设厅科技计划项目(2020-K5-144658)；广州市建筑集团有限公司科技计划项目(2021-KJ013、2021-KJ039)。
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参考文献[1] 詹良通,吴宏伟,包承纲,等.降雨入渗条件下非饱和膨胀土边坡原位监测[J].岩土力学,2003,24(2):151-158.
[2] CHEN G,MENG X M,QIAO L,et al. Response of a loess landslide to rainfall:observations from a field artificial rainfall experiment in Bailong River Basin, China[J].Landslides,2018,15(5):895-911.
[3] ASKARINEJAD A, AKCA D, SPRINGMAN S M.Precursors of instability in a natural slope due to rainfall:a full-scale experiment[J]. Landslides,2018,15(9):1745-1759.
[4] 汪华斌,周宇,余刚,等.结构性花岗岩残积土三轴试验研究[J].岩土力学,2021,42(4):991-1002.
[5] 刘攀.全风化花岗岩试验及本构模型研究[D].广州:华南理工大学,2016.
[6] 温勇,杨光华,汤连生,等.广州地区花岗岩残积土力学特性试验及参数研究[J].岩土力学, 2016, 37(S2):209-215.
[7] 陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450.
[8] 许建聪,尚岳全,陈侃福,等.强降雨作用下的浅层滑坡稳定性分析[J].岩石力学与工程学报,2005,24(18):3246-3251.
[9] 唐栋,祁小辉,蒋水华,等.不同前期降雨与土-水特征曲线对边坡稳定的影响[J].岩土工程学报,2015,37(S1):148-155.
[10] ZHANG L L, FREDLUND D G, ZHANG L M, et al.Numerical study of soil conditions under which matric suction can be maintained[J]. Canadian Geotechnical Journal,2004,41(4):569-582.
[11] Standard practice for classification of soils for engineering purposes(unified soil classification system):ASTM D2487-11[S]. West Conshohocken:ASTM International,2011.
[12] 土工试验方法标准:GB/T 50123—2019[S].北京:中国计划出版社,2019.
[13] Standard test method for measurement of soil potential(suction)using filter paper:ASTM D5298-10[S]. West Conshohocken:ASTM International,2010.
[14] 唐栋.考虑前期降雨影响的非饱和土特性及边坡稳定性分析[D].武汉:武汉大学,2016.
[15] VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil science society of America journal,1980,44(5):892-898.
[16] FREDLUND D G, XING A, HUANG S. Predicting the permeability function for unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal,1994,31(4):533-546.
[2] CHEN G,MENG X M,QIAO L,et al. Response of a loess landslide to rainfall:observations from a field artificial rainfall experiment in Bailong River Basin, China[J].Landslides,2018,15(5):895-911.
[3] ASKARINEJAD A, AKCA D, SPRINGMAN S M.Precursors of instability in a natural slope due to rainfall:a full-scale experiment[J]. Landslides,2018,15(9):1745-1759.
[4] 汪华斌,周宇,余刚,等.结构性花岗岩残积土三轴试验研究[J].岩土力学,2021,42(4):991-1002.
[5] 刘攀.全风化花岗岩试验及本构模型研究[D].广州:华南理工大学,2016.
[6] 温勇,杨光华,汤连生,等.广州地区花岗岩残积土力学特性试验及参数研究[J].岩土力学, 2016, 37(S2):209-215.
[7] 陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450.
[8] 许建聪,尚岳全,陈侃福,等.强降雨作用下的浅层滑坡稳定性分析[J].岩石力学与工程学报,2005,24(18):3246-3251.
[9] 唐栋,祁小辉,蒋水华,等.不同前期降雨与土-水特征曲线对边坡稳定的影响[J].岩土工程学报,2015,37(S1):148-155.
[10] ZHANG L L, FREDLUND D G, ZHANG L M, et al.Numerical study of soil conditions under which matric suction can be maintained[J]. Canadian Geotechnical Journal,2004,41(4):569-582.
[11] Standard practice for classification of soils for engineering purposes(unified soil classification system):ASTM D2487-11[S]. West Conshohocken:ASTM International,2011.
[12] 土工试验方法标准:GB/T 50123—2019[S].北京:中国计划出版社,2019.
[13] Standard test method for measurement of soil potential(suction)using filter paper:ASTM D5298-10[S]. West Conshohocken:ASTM International,2010.
[14] 唐栋.考虑前期降雨影响的非饱和土特性及边坡稳定性分析[D].武汉:武汉大学,2016.
[15] VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil science society of America journal,1980,44(5):892-898.
[16] FREDLUND D G, XING A, HUANG S. Predicting the permeability function for unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal,1994,31(4):533-546.
Study on unsaturated characteristics of granite residual soil and its slope stability
Abstract: Rainfall-induced landslide is one of the significant geological hazards in granite residual soil areas. To investigate the response of the granite residual soil slope to torrential rain, a series of studies which include in-situ rainfall monitoring, consolidated undrained triaxial tests and filter paper method were conducted on a typical unsaturated granite residual soil slope located in Huangpu, Guangzhou. Based on the monitoring data and tests results, the influence law of weathering degree on shear strength and soil-water characteristic curve was studied, and the effect of different local rainfall conditions on the site slope stability was gave insights into. The results show that as the weathering increases, the effective shear strength parameters of the granite residual soils decrease in different degrees, and the change range of effective internal friction angle caused by weathering difference is smaller than that of effective cohesion. The unsaturated hydraulic properties of granite residual soils are also affected by weathering difference. The decrease of slope safety factor is positively correlated with the rainfall intensity, while the recovery rate of slope safety factor is negatively correlated with the rainfall duration. This study can provide some reference for scientific design and disaster prevention and control of typical granite residual soil slope related projects.
Keywords: granite residual soil; triaxial testing; filter paper method; torrential rain; slope stability; weathering of rock and soil
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