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考虑流变固结效应和强度折减法的土质边坡安全系数

ISSN号：1672-7207
期刊名称：《中南大学学报：自然科学版》
时间：0
分类：TU432[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]湖南工程学院建筑工程学院,湖南湘潭411104, [2]中南大学资源与安全工程学院,湖南长沙410083
相关基金：国家自然科学基金资助项目（10972238,51274097）：湖南省教育厅科研资助项目（11C0341）：湖南省自然科学基金资助项目（11JJ4043）：中南大学自由探索计划项目（2011QNZT086）

关键词：边坡工程, 流变固结效应, 安全系数, 强度折减, slope engineering, rheology and consolidation influence, safety factor, strength reduction

中文摘要：

针对边坡的变形特点，探讨流变固结效应下土质边坡的稳定性，提出能完全反映土体流变3个典型阶段和非线性特点的流变模型-改进的西原流变模型。根据Terzaghi-维固结理论得出能反映流变固结耦合关系的流变固结控制方程和差分格式。利用强度折减技术分别建立流变作用和流变固结效应下强度折减法的计算式。并结合工程算例，得出Bishop法、常规弹塑性有限差分法、流变效应有效差分法和流变固结效应有限差分法的安全系数比较值。计算结果表明：流变固结效应下边坡的安全系数最大，Bishop法得到的安全系数最小，后者在工程设计中是保守的，研究结果对边坡的理论研究和工程实践具有一定的参考价值，建议在边坡工程的建设中应考虑流变和固结影响因素。

英文摘要：

Considering the characteristics of slope deformation at different periods, the soil slope stability under rheology and consolidation influence was induced. A modified Xiyuan creep model was estabished with series-wound Xiyuan and accelerated non-linear element model, which can show three phases and non-linear deformation on soil deformation. According to Terzaghi consolidation theory, two equations were obtained including rheology-consolidation control equation and differential equation, which can describe the coupled relation among rheology, seepage and consolidation. Two new strength reduction formula were also educed on rheologic soil strength and rheology-consolidation anti-shear strength. Based on engineering example, safety factor was calculated with strength reduction by four methods including Bishop method and three finite differential methods for elasto-plastic, rheology and rheology-consolidation function, respectively. The results show that the safety factor is maximum under rheology and consolidation influence and is minimum using Bishop method, which is conservative in engineering design. So the rheology and conslidation influence cannot be ignored in engineering construction and theory research on slope engineering.

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