【作者】 王云；

【导师】 王广月；

【作者基本信息】 山东大学 ， 结构工程， 2016， 硕士

【摘要】 步入21世纪以来,我国根据时代发展的需要开展了大量的基础设施建设,越来越多人工开挖的工程边坡代替原有的自然边坡被不断地应用在公路建设、水利工程、矿物开采以及地基处理等工程项目中。随着人们关于环境资源保护和可持续性发展这两个观念的不断深入,以浆砌石护坡为代表的传统护坡技术虽然在铺设初期有较好的防护效果,但鉴于其耐久性弱,生态效益差以及在施工时对周围环境的破坏严重,该传统护坡技术正被逐渐减小使用。相比于传统的灰色护坡技术,土工三维网垫植草生态护坡作为一种生态环保的绿色复合型生态护坡技术,凭借其施工方便、低成本、持久耐用等优点,目前也越来越多地被应用于工程建设中。土工三维网垫对边坡的加固作用主要分为两个阶段,即前期网垫的作用阶段和后期植草根茎的加固防护阶段。在边坡防护的后期,植草的根茎完全发育并开始发挥固土效果,最终发育完全的根、茎、叶对控制坡面径流的冲刷和抵抗来自雨水的冲击侵蚀有明显的作用。然而,在土工三维网垫植草防护技术的前期,由于植物的根茎尚未发育完全,防护作用主要依赖于覆盖在坡面表层的三维网垫。目前关于土工三维网垫的研究要集中在其对坡面表层的局部稳定性的研究已取得了巨大的进展,然而对防护边坡整体稳定性的影响作用尚未有一个明确的结论。因此,探究土工三维网垫能否提高边坡稳定性是目前亟需解决的问题。本文首先分别介绍了国内外关于土工三维网垫、边坡稳定性以及强度系数折减法的研究现状,然后根据三维网垫在边坡防护中的作用机理,以济青高速某路段的工程防护边坡为实际依托,基于强度系数折减法,利用有限元软件ABAQUS建立土工三维网垫防护边坡稳定性分析三维有限元模型,分析并得到不同降雨条件下含(不含)网垫边坡的安全系数、塑性分布情况、坡体内部位移分布情况,最后通过室内边坡稳定性模拟试验确定的边坡抬升的破坏角度,将室内模拟试验的结果与数值模拟分析得到的结论相比较以确定三维网垫对边坡整体稳定性的影响。更多还原

【Abstract】 Since the 21st century, our country has carried out a large number of infrastructure construction according to the needs of development, the artificial excavation engineering slopes have been constantly used in road construction, water conservancy project and foundation treatment, and other engineering projects by replacing the original natural slopes. Although the traditional slope protection technology such as plasma stone paving has good protective effect in the early stage of slope protection, as people have pay more and more attention to the protection of environmental resources and sustainable development, the use of it have been gradually deduced due to its serious damage to environment, lack of ecological benefits and poor durability. As a kind of ecological green compound ecological slope protection technology, three dimensional geonet grass ecological slope protection is now increasingly used in the engineering construction. Compared with the traditional grey slope protection technology, it has the advantage of convenient construction, low cost, good durability and so on.Three dimensional geonet slope protection technology mainly depends on the soil reinforcement from grass roots to achieve the effect of slope protection. In the late stage of protection, planting grass has grown completely and its roots soil fixation effect begin to play a role. Eventually the fully developed root plays an obvious role in controlling slope runoff scouring and resistance from the impact of the rain erosion. However in the early stage of three dimensional geonet protection technology, the plant roots have not yet fully developed and there are mainly three dimensional geonet covered on the surface of protective slope. In practical engineering project, the overall shear slide constantly appear in the layer of three dimensional geonet which leads to the failure of slope stability, and the failures always bring the failure of slope protection engineering project and huge economic losses.This paper firstly introduced the world-wide research status of three dimensional geonet, the slope stability and strength reduction method. And then analyzes the protection mechanism and its application of three dimensional geonet in project of soft soil subgrade reinforcement and slope protection. Make use of ABAQUS to establish three-dimensional finite element model of geonet protective slope project which is adopted from Jinan-Qingdao highway by combining theoretical analysis and numerical simulation method. Stability analysis is made by the method of coefficient of strength reduction, and under the same conditions, and get the result of the safety factor of different simulation conditions, plastic distribution, distribution of slope body parts’move as well as slope failure time under the same working condition by changing the influence parameters like rainfall intensity, rainfall duration. At last, verified the numerical simulation results of the slope stability through indoor simulation test.更多还原