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在简要分析土工格栅加筋技术的基础上,从加筋土工格栅的铺设、底层与上层土工格栅的铺设及土工格栅施工质量验收等方面,具体探讨了土工格栅加筋技术在公路路基加宽施工中的优化应用,以保证公路路基加宽施工的质量。 相似文献
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随着现代建筑事业对地基处理的要求日益增高,许多新的地基处理技术也得到开发和应用,其中土工格栅加筋土在土木工程中的应用也越来越广泛。该文首先阐述了土工格栅的种类和基本性能,然后从土体和土工格栅结合状态,以及力学性能方面,对其加筋机理进行了分析。研究表明:土工格栅可以依其良好的经济性能和加筋效果,应用于土木工程中。 相似文献
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土工格栅加筋土挡墙在土木工程中应用广泛,土工格栅的加筋作用以及筋材在挡墙设计中的计算需要进一步完善.利用FLAC3D有限元分析软件,对未设置和设置土工格栅加筋体的粉煤灰挡墙进行数值模拟分析,研究土工格栅的加筋作用对粉煤灰挡墙稳定性的影响,得到土工格栅加筋挡墙的设计参数.数值模拟结果表明:粉煤灰挡墙高度大于6m时,安全系数偏低,需要在粉煤灰挡墙中加筋来提高其安全系数,保证挡墙的稳定性.对墙高为8m的土工格栅粉煤灰加筋挡墙进行模拟分析,当增大加筋间距时,挡墙的侧向和竖向位移都增大,挡墙的最大竖向位移发生在挡墙的上部,最大侧向位移发生在挡墙中下部位;墙高为8m的土工格栅粉煤灰挡墙的合理加筋间距为0.8m. 相似文献
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土工格栅加筋技术综述 总被引:1,自引:0,他引:1
根据土工格栅的发展现状,对土工格栅的受力模式、加筋功能、应用范围等进行了阐述,为广大工程技术人员进一步了解和使用土工格栅加筋技术提供一些理论参考。 相似文献
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土工格栅加筋路堤的机理分析及其应用 总被引:1,自引:0,他引:1
目前,土工格栅加筋路堤的方法在高填方路堤工程中正获得越来越多的应用。本文首先分析了土工格栅加筋路堤的机理,包括三个方面的因素:承担水平荷载,提高地基土承载力;增大地基土的约束力,提高竖向承载力;抑制土拱效应,减小路基沉降量。然后以某土工格栅加筋在公路路堤工程中的应用为例,论述了该技术的施工流程、技术参数、施工要点和质量控制等,表明了土工格栅具有较高的工程应用价值。 相似文献
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论述了土工格栅的性能,分析了土工格栅加筋路堤中筋材与土的相互作用,并介绍了土工格栅加筋机理的理论依据和试验分析,指出土工格栅是一种良好的路用加筋材料,其加筋路堤的作用主要通过土工格栅筋材的拉力激发来实现。 相似文献
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为了研究交通荷载作用下考虑软土软化效应的软基加筋道路加筋效果的影响因素,首先以室内动三轴试验为基础,通过回归分析得到了软土在循环荷载作用下动模量衰减的经验公式;然后编制了用户子程序将该公式导入有限元分析软件ABAQUS中,采用有限元分析了荷载形式、荷载频率、筋材模量、加筋位置、加筋层数、软土层厚度等对加筋效果的影响。结果表明,随着荷载频率的增大,加筋效果呈减小趋势。加筋效果会随着筋材模量的增大和加筋层数的增多而增大。当筋材铺设在面层和基层之间时,加筋效果最好。在软土层厚度较小时,加筋效果随软土层深度增大有明显提高;但在软土层厚度较大时,加筋效果随软土深度增加提高较少。 相似文献
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Michael R. Simac 《Geotextiles and Geomembranes》1990,9(4-6):537-546
A general discussion on connection types for geogrid reinforcement systems is presented. The various mechanical and frictional methods for connecting geogrid to geogrid, and geogrid to a structural element are defined in general terms. Basic design guidelines are recommended to assure connection integrity for geogrid reinforcement systems. 相似文献
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《Geotextiles and Geomembranes》2023,51(5):81-92
Road construction in karst areas is a challenging task. Combining the advantages of geosynthetics and fiber Bragg grating (FBG), this paper creatively presents a new type of FBG-3D printed geogrid, which allows reinforcement and accurate deformation monitoring. A series of model tests were carried out to investigate the mechanical and deformation characteristics of the subgrade with underlying karst cave reinforced by FBG-3D printed geogrid. The experimental results indicated that the fully coordinated deformation between FBG sensor and geogrid was successfully achieved by 3D printing technology, and the relationship between fiber wavelength and strain was obtained. The existence of cave had an adverse effect on the subgrade, but the FBG-3D printed geogrids effectively improved the bearing capacity and footing settlement, and the reinforcement effect increased with the decrease of geogrid spacing. In the cyclic loading experiments, the earth pressure inside the subgrade reinforced by geogrid changed as a half-sine wave in each cycle. The FBG sensors accurately measured the strain change inside the subgrade, and the data showed that the deformation of measuring point above the cave model was the largest. The research conclusions provide important basic data for the construction and monitoring of highway and geotechnical engineering projects. 相似文献
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《Geotextiles and Geomembranes》2020,48(6):768-779
Vertical stiffness and shear strength of ballasts are significantly degraded when contaminated with sands. There is a lack of solutions/studies related to strengthening ballast against sand contamination. Addressing this limitation, a comprehensive laboratory investigation was made on effectiveness of geogrid reinforcement for improvement of mechanical properties of sand-contaminated ballast. To this end, large-scale direct shear tests as well as plate load tests were conducted on geogrid-reinforced ballast samples prepared with different levels of sand contamination. The obtained results indicate that geogrid reinforcement considerably improves shear strength and vertical stiffness of contaminated ballast. A bandwidth was obtained for contamination levels in which ballast reinforcement is effective. Through examining geogrid with different aperture sizes and locations in the ballast layer, the best performance conditions of geogrid reinforcement were derived. The results were used to propose an effective method of ballast reinforcement and an efficient ballast maintenance approach in sandy areas. 相似文献
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对经编格栅和玻纤格栅加筋粘性土进行不固结不排水的三轴压缩试验。试验结果表明,在粘性土体上布置格栅筋材,都能提高土体强度,但不同的筋材,其加筋效果是不一样的,经编格栅加筋土的加筋效果要优于玻纤格栅加筋土。加筋层数越多,加筋效果越好;随着加筋土应力增加,加筋土抵抗变形的作用才能得到更充分发挥,土体加筋效果更明显。不同筋材的加筋土,其粘聚力与内摩擦角的变化规律不一致;玻纤格栅和经编格栅加筋粘性土的加筋效果与砂土不同,不仅表现在粘聚力的增加上,还表现在内摩擦角的增加上。加强筋条结点连接的牢固性,能够提高加筋效果。 相似文献
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采用土工格栅加筋的方法提高废旧轮胎挡墙的承载性能,促进废旧轮胎挡墙的推广应用,通过数值计算方法分析了不同墙顶荷载下有无土工格栅加筋的废旧轮胎挡墙的水平变形与竖向沉降反应特征,得出铺设土工格栅加筋的方法可显著减小墙体的水平变形和竖向沉降,提高废旧轮胎挡墙结构的承载能力,随着外荷载的增加,墙体变形模式依次呈凹凸微小变化型、“弯弓”型、“似弯弓”型和“鼓腮”型和直线型。考虑土工格栅的加筋长度、竖向加筋间距以及格栅加筋刚度3种因素对废旧轮胎+土工格栅加筋土挡墙的水平变形的影响,得出在废旧轮胎加筋土挡墙设计中,建议土工格栅的加筋长度选取范围为0.5H~0.7H,土工格栅竖向间距的选取范围为0.4 m~0.7 m,格栅刚度不宜大于5 000 kN/m。 相似文献
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《Geotextiles and Geomembranes》2019,47(6):803-814
This paper is to investigate the effectiveness of encapsulating geogrid layers within thin sand layers, for enhancing the deformation behavior of vertical reinforced soil walls constructed with marginal backfills. Centrifuge model tests were performed on vertical soil walls, reinforced with geogrid layers, using a 4.5 m radius large beam centrifuge available at IIT Bombay at 40 gravities. The backfill conditions, height of soil wall, reinforcement length, and reinforcement spacing, were kept constant in all the tests. A wrap-around technique was used to represent flexible facing. Three different geogrid types with varying stiffness were used in the present study. The walls were instrumented with vertical linear variable differential transformers to monitor surface settlements during the tests. Marker-based digital image analysis technique was used to determine face movements and distribution of geogrid strain along the wall height. The deformation behavior of soil walls, reinforced with geogrid layers encapsulated in thin layers of sand, were compared against a base model having no sand-cushioned geogrid layers. Provision of sand-cushioned geogrid layers and increase in geogrid stiffness were found to limit normalized face movements (Sf/H), normalized crest settlements (Sc/H), and change in maximum peak reinforcement strain (dεpmax). Sand-cushioned geogrid layers were also found to limit the development of tension cracks behind and within the reinforced zone. Significant reduction in rate of maximum face movement (dSfmax/dt) and rate of maximum peak reinforcement strain (dεpmax/dt) was observed, with an increase in value of normalized reinforcement stiffness (Jg/γH2) of geogrid layers. The analysis and interpretation of centrifuge model tests on soil walls, constructed with marginal backfills and reinforced with sand-cushioned geogrid layers, indicate that their performance is superior to the walls without sand-cushioned geogrid layers. 相似文献
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结合P1axis程序对加筋路堤软基的变形进行分析,通过对三种形式的路堤进行数值分析比较,得出了一些结论,分析结果表明,加筋能够很好的限制侧向变形,显著减少沉降和不均匀沉降,且立体加筋的效果要好于平面加筋。 相似文献