共查询到20条相似文献，搜索用时 143 毫秒
1.
冯栋栋 《长江工程职业技术学院学报》2022,(3):6-10
由于建筑物地基开挖或回填,边坡工程稳定已经成为岩土工程中最常见的安全问题之一。土工格栅具有独特的物理力学性能,将其作为加筋材料应用于边坡支护工程中,能够有效地改善边坡的变形特性,提高边坡的稳定性。以深圳某填土边坡采用土工格栅作为加筋材料作为实例,从计算分析、施工要点、优缺点等方面探讨了土工格栅在填土边坡中的应用。 相似文献
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邵建梁 《兰州石化职业技术学院学报》2003,3(2):20-22
高等级公路的施工中，在高填方路段分层铺设高强土工格栅，较好地解决了路基沉陷问题。但铺设土工格栅的滑动稳定性验算，仍待进一步探讨。对计算公式、格栅层数、铺设要求进行了讨论。 相似文献
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翟文武 《河北工业大学成人教育学院学报》2008,23(3):52-56
针对辽宁省石佛寺水库枢纽一期坝顶加高工程申存在现场土石料短缺、土石料运距远和单价高等技术经济难题.将双面格栅加筋挡土墙结构用于大坝加高工程以降低对回填料性质的要求,并对双面加筋挡墙结构进行非线性有限元分析计算,综合比较实测结果与计算结果表明:双面格栅加筋挡土墙能有效控制顶部的变形,筋材应力与应变值处于较低水平,加筋结构安全和整体效果好,对土工格栅在筑坝工程中的应用有重要参考意义. 相似文献
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本文从土工合成材料的定义、种类、功能、用途等方面概括阐述了其在道路工程中的应用,并重点阐述了其在路堤加筋用途中的选型.结合武康铁路二线襄胡段高填路堤施工中采用土工格栅加固路基边坡的实例,介绍了土工格栅加固高填路堤工程基底填筑、放线铺设、定位锚固、填筑碾压等的施工技术,并指出了在施工中应注意的事项. 相似文献
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土工格栅作为一种新型土工合成材料，具有高强度、低延伸率等特点，被用作路堤加筋材料。运用有限元通用程序ADINA对土工格栅软基路堤工程进行二维有限元分析，土体本构采用Mohv-Coulomb模型，土工格栅采用杆单元模拟，接触单元采用平面应变2-D单元。通过计算得到软基路堤工程各部位与各阶段的沉降、侧向位移变化特征，有限元计算结果与实测数据基本吻合。 相似文献
8.
徐晓 《淮北职业技术学院学报》2013,12(3):97-99
采用FLAC3D三维快速拉格朗日分析程序,对混凝土框格梁加固填筑边坡进行数值分析。选取安全系数、剪应变位移增量、坡体表面监测点的侧向位移和竖向沉降作为评价指标,对框格梁加固边坡稳定性效果进行了分析,并对不同框格梁加筋方案对边坡稳定性的影响进行了初步探讨。 相似文献
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在桥梁台背回填土内铺设土工格栅,对减少桥头跳车有很好的效果。本文结合工程实例,简要介绍了土工格栅在桥台背回填中的应用、作用原理及施工要求。 相似文献
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黄伟达 《福建工程学院学报》2012,10(6):567-570
在高陡填方区采用土工格栅加筋土挡墙,容易产生较大变形,且至变形稳定持续时间长。文章以某填方边坡为例,对无面板式加筋土挡墙的变形性状进行分析,分析结果表明,无面板式高陡加筋土挡墙的大变形,主要是地质条件、填料及土工格栅材料、施工条件、面板等综合影响。基此,提出了防患加筋土挡墙变形的相应建议。 相似文献
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Model test and numerical analysis on long-term mechanical properties of stepped reinforced retaining wall 总被引：1，自引：0，他引：1
Model tests and numerical analyses of stepped reinforced retaining wall were performed to investigate the effects of rheology of backfill and creep of geogrids on the long-term performance of the structure.The geogrid tensions,soil pressures,wall deformations and foundation pressure were measured during model construction and loading.A visco-elasto-plastic model and an empirical nonlinear visco-elastic model were utilized to simulate the stresses and deformations of geogrid-reinforced earth-retaining wall under long-term loads.By comparing test data with numerical results,it is shown that the foundation pressure distribution is nonlinear,and the lateral constraint of geogrids for backfill can cause a redistribution of foundation pressure.The curve of soil pressure is outside convex at each step initially,and it is close to the distribution for the case of vertical wall subsequently.The variation trend of geogrid tensions at different heights is obtained.Moreover,the failure mechanism and development mode of potential slip surface in retaining wall are proposed. 相似文献
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以紫金山金铜矿开采为工程背景,根据矿山规划设计,露采至+100 m水平后进行井工开采。为了研究井工开采对露天边坡的影响,采用FLAC3D建立数值模型,研究采区位于边坡体不同空间位置对边坡稳定性产生的不同作用机制,分析露天边坡和采空区围岩位移演化规律、应力分布规律。数值模拟结果表明:当井采区位于边坡坡脚区时,井工开采直接破坏了坡脚区边坡岩体,坡面整体向坡脚处滑移,最大水平位移达到2.21 m,最大竖向位移达到1.67 m;当井采区位于坡中区开采时,其开采破坏了坡中边坡岩体,可能导致上部坡体失稳破坏;当井采区位于坡外区时,由于采区上部岩层沉陷导致边坡整体坡角减小,从而有利于边坡整体稳定性。对比3种开采位置,采区位于坡脚时对边坡稳定性最不利,采区处于坡外时采动效应对边坡稳定性的影响最低。 相似文献
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The interaction between geogrid and soil is crucial for the stability of geogrid-reinforced earth structure. In finite element (FE) analysis, geogrids are usually assumed as beam or truss elements, and the interaction between geogrid and soil is considered as Coulomb friction resistance, which cannot reflect the true stress and displacement developed in the reinforcement. And the traditional Lagrangian elements used to simulate soil always become highly distorted and lose accuracy in high-stress blocks. An improved geogrid model that can produce shear resistance and passive resistance and a soil model using the Eulerian technique, in combination with the coupled Eulerian-Lagrangian (CEL) method, are used to analyze the interaction between geogrid and soil of reinforced foundation test in ABAQUS. The stress in the backfill, resistance of geogrid, and settlement of foundation were computed and the results of analysis agree well with the experimental results. This simulation method is of referential value for FE analysis of reinforced earth structure. 相似文献
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路堑岩质边坡具有规模大、数量多、参数获取困难、治理难度大等特点,历来是线路工程中的研究热点.为了解决路堑岩质边坡的稳定评价问题,建立边坡稳定性的模糊综合评价体系,可供同类工程借鉴.根据路堑岩质边坡的特点,以系统全面性、简明科学性、相对独立性及灵活可操作性为原则,选取合理的边坡稳定性评价指标,建立边坡稳定性的模糊综合评价体系,运用层次分析法确定评价指标的权重,建立了路堑岩质边坡的稳定性分级模型.以某国道辅线K57+411～K57+536段边坡为例,运用该模型对其稳定性级别进行了模糊综合评判分级,其结果为不稳定,与规范法的评价结果一致,表明该方法是合理实用的. 相似文献
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Slope stability hazard management systems 总被引：2，自引：0，他引：2
FREDLUND Delwyn G 《浙江大学学报(A卷英文版)》2007,8(11):1695-1711
Weather-related geo-hazards are a major concern for both natural slopes and man-made slopes and embankments. Government agencies and private companies are increasingly required to ensure that there is adequate protection of sloping sur- faces in order that interaction with the climate does not produce instability. Superior theoretical formulations and computer tools are now available to address engineering design issues related to the near ground surface soil-atmospheric interactions. An ex- ample is given in this paper that illustrates the consequences of not paying adequate attention to the hazards of slope stability prior to the construction of a highway in South America. On the other hand, examples are given from Hong Kong and Mainland China where significant benefits are derived from putting in place a hazard slope stability management system. Some results from a hazard management slope stability study related to the railway system in Canada are also reported. The study took advantage of recent research on unsaturated soil behaviour and applied this information to real-time modelling of climatic conditions. The quantification of the water balance at the ground surface, and subsequent infiltration, is used as the primary tool for hazard level assessment. The suggested hazard model can be applied at either specific high risk locations or in a more general, broad-based manner over large areas. A more thorough understanding of unsaturated soil behaviour as it applies to near ground surface soils, along with the numerical computational power of the computer has made it possible for new approaches to be used in slope hazard management engineering. 相似文献
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基于非线性有限元方法，对路堤各施工阶段路基体内水平位移的变化特性进行了考察，对比分析表明：在各施工阶段路基体内最大水平位移的位置并不是固定不变的，其随着填筑和固结阶段的不同而发生变化。最大水平位移的位置一般位于坡趾处竖向断面与坡中竖向断面之间的范围附近，故建议把测斜仪布置在该范围内(为了施工方便，可布置在坡中竖向断面或坡趾竖向断面处)。分析还表明，工程中通常采用的利用测斜仪来量测路基深部水平位移发展情况的技术存在一定的缺陷，故需发展更精密的仪器来考察路基水平位移的基本特性。 相似文献
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Thebasicstressvariablesintheconstitutivemodelde velopedbyAlonsoetal[5] aresoilnetstressandsoilmatricsuctions ,whicharedefinedby σ″ =σ -ua (1) s=ua-uw (2 )whereσisthetotalstress,uwistheporewaterpressureanduaistheporeairpressure . Thenetmeanstresspanddeviatoricstressqarede finedas p =σ1+2σ33-ua (3) q =σ1-σ3(4 ) Asgenerallyregarded ,thesoilsuctioniscomposedoftwoparts ,matricsuctionandosmosissuction .TheosmosissuctionisneglectedoriginallyinAlonsoetal′smodelandhe… 相似文献
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Physically-based approach to analyze rainfall-triggered landslide using hydraulic gradient as slide direction 总被引：1，自引：0，他引：1
Qi-hua Ran Dan-yang Su Qun Qian Xu-dong Fu Guang-qian Wang Zhi-guo He 《浙江大学学报(A卷英文版)》2012,13(12):943-957
An infinite slope stability numerical model driven by the comprehensive physically-based integrated hydrology model (InHM) is presented. In this approach, the failure plane is assumed to be parallel to the hydraulic gradient instead of the slope surface. The method helps with irregularities in complex terrain since depressions and flat areas are allowed in the model. The present model has been tested for two synthetic single slopes and a small catchment in the Mettman Ridge study area in Oregon, United States, to estimate the shallow landslide susceptibility. The results show that the present approach can reduce the simulation error of hydrological factors caused by the rolling topography and depressions, and is capable of estimating spatial-temporal variations for landslide susceptibilities at simple slopes as well as at catchment scale, providing a valuable tool for the prediction of shallow landslides. 相似文献
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The effects of stabilizing piles on the stability of an embankment slope are analyzed by numerical simulation. The shear strength reduction method is used for the analysis, and the soil - pile interaction is simulated with zero-thickness elasto-plastic interface elements. Effects of pile spacing and pile position on the safety factor of slope and the behavior of piles under these conditions are given. The numerical analysis indicates that the positions of the pile have significant influence on the stability of the slope, and the pile needs to be installed in the middle of the slope for maximum safety factors. In the end, the soil arching effect closely associated with the space between stabilizing piles is analyzed. The results are helpful for design and construction of stabilizing piles. 相似文献
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Based on elastoplastic model, 2D and 3D finite element method (FEM) are used to calculate the stress and displacement distribution in the soft clay slope under gravity and uniform load at the slope top. Stability analyses indicate that 3D boundary effect varies with the stress level of the slope. When the slope is stable, end effect of 3D space is not remarkable. When the stability decreases, end effect occurs; when the slope is at limit state, end effect reaches maximum. The energy causing slope failure spreads preferentially along y-z section, and when the failure resistance capability reaches the limit state, the energy can extend along x-axis direction. The 3D effect of the slope under uniform load on the top is related to the ratio of load influence width to slope height, and the effect is remarkable with the decrease of the ratio. 相似文献