郴州地区缓开挖边坡降雨入渗作用下稳定性分析方法研究
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摘要
近年以来,随着市政道路建设的大规模兴起,郴州地区路堑缓开挖边坡由于其红粘土特殊的结构性及水敏性,出现了大量失稳的状况。据调查,在对郴州地区缓开挖边坡进行稳定性计算时往往会得出当前边坡是处于稳定状态的计算结果(现场实际情况也是如此)。但边坡开挖后在坡面长期暴露以及降雨入渗等因素影响下,红粘土层的抗剪强度会大幅降低,导致边坡稳定性相应不断下降,最终出现了大量缓开挖边坡失稳的情况。为了解决这一生产实践中遇到的矛盾,需要对现有的边坡稳定性计算方法作出相应改进,以使之能够用于缓开挖边坡的稳定性计算。
本文分析和总结了国内外对红粘土特性的相关研究成果；搜集、分析了研究区的地形地貌、岩性及气象水文条件等重要资料；总结、归纳了郴州地区缓开挖边坡的主要破坏类型、坡体结构形式及滑动模式,并将较为常见的岩土结构类型A类缓开挖边坡作为本文研究的重点；通过室内试验,研究了郴州地区典型红粘土的基本物理力学性质和强度水敏感性,建立了强度指标与含水率之间的函数模型；根据郴州地区缓开挖边坡主要特点及主要致滑因素,在考虑降雨入渗对边坡红粘土强度参数的影响前提下,对应用广泛的简化Bishop进行改进,并提出了警戒含水量概念,使改进后的简化Bishop能用于缓开挖边坡的稳定性分析；最后,以相山大道6号边坡作为案例,采用数值模拟软件Plaxis对其开挖直至失稳过程(其中包含了由降雨入渗引起的红粘土强度降低的过程)进行模拟,将得到的模拟结果(各阶段剪应变云图)与现场监测数据进行比对,从一定程度上验证了本文所提出的郴州缓开挖边坡红粘土虑降雨入渗作用下的含水率—强度指标公式对于6号边坡的适用性。
In recent years, with the proliferation of municipal road construction, gently excavated slope of Chenzhou because of sensitivity to the special structure and water sensitivity of the red clay there a large number of landslides. According to the survey, gently excavated slope in the area of Chenzhou stability calculations are often found in slope is stable (the actual site is the case). However, due to long-term exposure, and rainfall infiltration on slope and other factors, the shear strength of red clay layer significantly reduced, resulting in the corresponding declining slope stability, culminating in a large number of gently excavated slope Landslide. In order to solve the contradictions encountered in this project, we need to making improvements to the slope stability calculation methods, so that these methods can be used for gently excavated slope stability calculations.
This paper analyzed and summarized the domestic and foreign-related properties of red clay research; collected and analyzed topography, lithology and other important information on meteorological and hydrological conditions of the study area; conclude and summarize the main damage type slope structure and sliding mode of gently excavated slope in Chenzhou, and in the same time the more common type of rock structure excavation Class A gentler slope as the focus of this paper. Through laboratory experiments it studied the typical red clay Chenzhou the basic physical and mechanical nature and intensity of water sensitivity, established between the strength index and moisture content of the function model; considering the rainfall infiltration on the slope in the red clay strength parameters of the premise, according the main characteristics and the main cause of slope landslide factors in Chenzhou, it widely used to improve the simplified Bishop method. The paper put forward the concept of alert moisture content, so that the improved simplified Bishop method can be used to gently excavated slope stability analysis; Finally, it compared the 6th Avenue hill slope as a case, and the use of Plaxis software to simulate the process of landslide (which includes the infiltration of rainfall caused by the lower intensity of red clay process), will be the simulation results (all stages Shear strain contour) compared with field monitoring data, which demonstrate a sense of t The formula proposed in this paper for the applicability of the slope6 in Chenzhou.
本文分析和总结了国内外对红粘土特性的相关研究成果；搜集、分析了研究区的地形地貌、岩性及气象水文条件等重要资料；总结、归纳了郴州地区缓开挖边坡的主要破坏类型、坡体结构形式及滑动模式,并将较为常见的岩土结构类型A类缓开挖边坡作为本文研究的重点；通过室内试验,研究了郴州地区典型红粘土的基本物理力学性质和强度水敏感性,建立了强度指标与含水率之间的函数模型；根据郴州地区缓开挖边坡主要特点及主要致滑因素,在考虑降雨入渗对边坡红粘土强度参数的影响前提下,对应用广泛的简化Bishop进行改进,并提出了警戒含水量概念,使改进后的简化Bishop能用于缓开挖边坡的稳定性分析；最后,以相山大道6号边坡作为案例,采用数值模拟软件Plaxis对其开挖直至失稳过程(其中包含了由降雨入渗引起的红粘土强度降低的过程)进行模拟,将得到的模拟结果(各阶段剪应变云图)与现场监测数据进行比对,从一定程度上验证了本文所提出的郴州缓开挖边坡红粘土虑降雨入渗作用下的含水率—强度指标公式对于6号边坡的适用性。
In recent years, with the proliferation of municipal road construction, gently excavated slope of Chenzhou because of sensitivity to the special structure and water sensitivity of the red clay there a large number of landslides. According to the survey, gently excavated slope in the area of Chenzhou stability calculations are often found in slope is stable (the actual site is the case). However, due to long-term exposure, and rainfall infiltration on slope and other factors, the shear strength of red clay layer significantly reduced, resulting in the corresponding declining slope stability, culminating in a large number of gently excavated slope Landslide. In order to solve the contradictions encountered in this project, we need to making improvements to the slope stability calculation methods, so that these methods can be used for gently excavated slope stability calculations.
This paper analyzed and summarized the domestic and foreign-related properties of red clay research; collected and analyzed topography, lithology and other important information on meteorological and hydrological conditions of the study area; conclude and summarize the main damage type slope structure and sliding mode of gently excavated slope in Chenzhou, and in the same time the more common type of rock structure excavation Class A gentler slope as the focus of this paper. Through laboratory experiments it studied the typical red clay Chenzhou the basic physical and mechanical nature and intensity of water sensitivity, established between the strength index and moisture content of the function model; considering the rainfall infiltration on the slope in the red clay strength parameters of the premise, according the main characteristics and the main cause of slope landslide factors in Chenzhou, it widely used to improve the simplified Bishop method. The paper put forward the concept of alert moisture content, so that the improved simplified Bishop method can be used to gently excavated slope stability analysis; Finally, it compared the 6th Avenue hill slope as a case, and the use of Plaxis software to simulate the process of landslide (which includes the infiltration of rainfall caused by the lower intensity of red clay process), will be the simulation results (all stages Shear strain contour) compared with field monitoring data, which demonstrate a sense of t The formula proposed in this paper for the applicability of the slope6 in Chenzhou.
引文
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[3]R.M. Madu. An Investigation into the geotechnical and engineering properties of Some laterite of eastern Nigeria[J].Eng Geol,1997, (11):5[3]M.D Gidigaso. Mode of Formation and geotechnical characteristics of laterite materials of Ghana in relation to soil forming factors[J].Eng Geol,1997, (2):11-15
[4]赵训华.廖义玲.红粘土颗粒之间结构连结的胶体化学特征.贵州工业大学学报(自然科学版),2004,33(1)：26-29
[5]余敦猛.武广客运专线原装红粘土强度和变形特性试验研究：[硕士论文].长沙：中南大学,2008
[6]常立君,刘小文.江西地区非饱和红土的强度特性试验研究[J].陕西建筑,2008,(总152)：42-45
[7]何益东.关于红粘土的若干问题研究：[硕士论文].南宁：广西大学,2007
[8]曹志娇.非饱和红粘土抗剪强度特性研究及其应用：[硕士论文].长沙：中南大学,2008
[9]阳岳龙,周群,林剑.湖南主要地质灾害与地形地貌之关系.灾害学,2007,22(3)：36-40
[10]胡爱军,李宁,吴吉东,黄炜敏,温玉婷,黄小玉,胡海滨.基于经验似然比函数模型的降水型滑坡灾害概率风险分析与预测.灾害学,2009,24(3)：1-6
[11]陈宾.郴州地区残坡积土工程边坡过程稳定性研究及控制.[博士论文].长沙,2010
[12]谢云峰.湖南省郴州市梨树山滑坡的成因机制及防治.中国地质灾害与防治学报,2006,17(3)：165-166
[13]李定桥.浅谈山区公路边坡滑坡的综合治理.中国地质灾害与防治学报,2007,18(2)
[14]Skempton, A.W. Longterm stability of clay slopes[J]. Geotechnique,1964,14 (1).77-101
[15]姚裕春.边坡开挖工程活动对环境影响研究.[博士论文].西安：西南交通大学,2005
[16]赵晓彦,胡厚田.用离心模型试验研究花岗岩残积土边坡的破坏特性[J].海洋预报,2005,13(3)：410-414
[17]张嘎,王爱霞.边坡破坏过程离心模型试验的应力位移场研究[J].岩土力学,2008,29(10)：2637-2641
[18]许强,白建光.三峡库区塌岸的物理模拟研究[J].工程地质学报,2007,15(2)：154-158
[19]李天斌.拱坝坝肩稳定性的地质力学模拟研究[J].岩石力学与工程学报.2004,23(10)：1670-1676
[20]许向宁,王兰生.地震导致山体变形破裂机制地质力学模拟试验研究[J].地学前缘2009,21(3)：34-39
[21]Chen, R.H. and Chameau, J.L. Three dimensional limit equilibrium analysis of slopes[J].Geotechnique,1983,33(1):31-40
[22]Ugai,K.Three-dimensional stability analysis of vertical cohesive slopes[J].Soils and Found.1985,25(3):41-48
[23]阿布·里提甫.基于FLAC (3D)的黄土边坡稳定性分析[J].中国煤炭地质,2008,(09),32-35
[24]Andrea Segalini, Gian Paolo Giani.Geomechanical studies on slow slope movements in Parma Apennine[J].Engineering Geology,2009,(109):31-44
[25]阳岳龙,廖静男,林剑.湖南郴州市山洪灾害的特征及成因分析.中国地质灾害与防治学报,2008,19(3)：135-136
[26]杨果林,刘义虎,黄向京[M].膨胀土处置理论与工程建造新技术.北京：人民交通出版社,2008,92-98
[27]郑健龙,杨和平.公路膨胀土工程[M].北京：人民交通出版社,2008,12-31
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