泄洪雾雨区裂隙岩质边坡饱和-非饱和渗流场与应力场耦合分析  

Coupled analysis of fracture rock mass slope saturated-unsaturated seepage field and stress field in flood discharge atomized rain area

作　　者：王环玲[1] 徐卫亚[2] 童富国[2] 

机构地区：[1]河海大学交通学院,南京210098 [2]河海大学岩土工程研究所,南京210098

出　　处：《岩土力学》2008年第9期2397-2403,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展规划(973)项目(No.2002CB412707);国家自然科学基金(No.50128908)联合资助

摘　　要：岩质滑坡除与地质条件、降雨等因素有关外,泄洪雾雨也成为其不可忽视的催化剂。通过裂隙岩体渗透性与应力关系,裂隙岩体的弹塑性本构关系以及渗流场的控制方程,建立起饱和非饱和渗流场与应力场耦合的等效连续介质模型。编制了有泄洪雾雨影响的饱和-非饱和渗流与应力耦合三维有限元程序,通过迭代求解达到两场耦合目的。以实际工程为例,根据边坡的地表信息、开挖信息、岩层分界信息以及排水洞和帷幕信息等,建立起边坡地质模型。通过耦合计算,详细分析了耦合后边坡岩体的变形、应力以及塑性区等。计算结果表明,雾雨区的边坡稳定与渗流场变化有着重要关系,在评价边坡稳定与否时,要考虑渗流场对其影响。计算成果为实际工程的安全评价提供了一定的科学依据。Flood discharge atomized rain is the non-neglectable activator for rock mass landslide, which besides the rainfall. At first, through the relation between seepage characters of fracture rock mass and stress, elastic-plastic constitutive equation of fracture rock mass and control equation of seepage field, the equation continue media model of seepage and stress field coupling is established. Secondly, a 3-D finite element program of saturated-unsaturated seepage and stress coupling under atomized rain programmed, the two-field coupling is solved by iteration method. Finally, taking a typical project for example, the geological model is established according to the earth＇s surface information, excavation information, terrane borderline information, drainage hole and purdah information; the rock mass deformation, stress and plastic area are analyzed in detail by coupling computation, the analysis shows that the slope stability has closely related with the change of saturated-unsaturated seepage field of rock mass system; the seepage field of rock mass system must be considered when estimating slope stability. The result can provide some scientific foundation for project slope stability estimation.

关 键 词：泄洪雾雨 饱和-非饱和渗流 裂隙岩体 渗流场与应力场耦合 岩石边坡 

分 类 号：O357[理学—流体力学] TU452[理学—力学]