黄土地区高速公路堤边坡稳定性分析与优化设计

文章针对现阶段黄土地区高速公路堤边坡稳定性的相关问题,提出了优化方案并利用理正岩土软件和ABAQUS软件进行了边坡稳定计算。计算结果显示:优化后的路堤边坡安全系数均大于规范规定的1.25且有一定的安全储备,优化后可显著减少路堤填方、边坡支护面积和公路占地面积。最后,基于边坡安全系数提出了植物防护和工程防护相结合的边坡支护方案,为堤边坡的稳定性后续研究提供了较大的现实价值。

季节性冻土区高速堤边坡的加固研究

我国作为一个幅员辽阔的国家,地形差异较大,部分地区属于高寒地区存在较为广阔的冻土.季节性冻土对于当地的基础设施建设例如高速公路来说影响重大,极大地影响了道路的通畅性.因此在开展工程建设的过程当中,要加强对于季节性工作区高速堤边坡的设计.本文围绕土工格栅和石笼挡墙两种方式进行高速堤边坡的加固.

立堵截流戗堤堆石分叉特性研究

根据截流戗堤边坡的两种不同坍塌现象的特点 ,进行定性分析并总结其主要影响因素 ,包括抛投材料的抗冲能力、戗堤基础的抗冲能力、龙口水深、抛投材料的力学性质和抛投材料的浸水湿化。引用戗堤堆石的一个微结构模型 ,运用静态分叉和奇异性理论 ,进一步研究了戗堤堆石的分叉特性。结果表明 ,堆石内部的应力变化和抛投材料的浸水湿化是深水截流中戗堤边坡高频率、大规模坍塌的根本原因。据此 ,提出了实际施工时应采取的工程措施 。

Stability analysis of cohesive soil embankment slope based on discrete element method

In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.

Numerical Analysis of the Stability of Embankment Slope Reinforced with Piles

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.

Numerical analysis on seismic behavior of railway earth embankment: A case study

A numerical case study on the seismic behavior of embankment was carried out based on a prototype of earth embankment in Yun-Gui Railway （from Kunming City to Nanning City） in southwest of China. A full-scale model of earth embankment was established by means of numerical simulation with FLAC3D code. The numerical results were verified by shaking table test. The seismic behaviors of earth embankment were studied, including the horizontal acceleration response, the vertical acceleration response, the dynamic displacement response, and the block state of earth embankment. Results show that the acceleration magnification near the embankment slope is larger than that in internal earth embankment body. With the increase of input peak acceleration, the horizontal acceleration magnification presents a decreasing trend. The horizontal acceleration response at the top of embankment is more sensitive to the intensity of ground motion than that at the bottom of cmbankment. The embankment presents an obvious nonlinear-plastic characteristic when the input horizontal peak acceleration is larger than 0.3 g. The maximum residual deformation occurs in the middle of embankment slope surface instead of at the top of embankment. The upper part of embankment experiences tension failure without shear failure, and area at mainly presents shear failure under the earthquake loading. surface of earth embankment. the bottom of embankment around the symmetry-axis of embankment The tension failure and shear failure repeatedly occur along the slope

Load-Bearing Capacity of the Footing Resting on a Reinforced Fly Ash Slope

In several parts of the world, disposal of waste materials such as fly ash is a great problem. Application of waste materials as structural fills in foundations is one of the best solutions to disposal problems, because wastes can be used in large volumes in such applications. There may be difficulty due to poor load-bearing capacity of fly ash, especially when footing rests on the top of the fly ash fill slope. Inclusion of polymeric reinforcements as horizontal sheets within the fill may be one of the most viable solutions to improving the load-bearing capacity of reinforced fly ash slope, and it is particularly important for the situations where foundations need to be located either on the top of a slope or on slope itself. The present work is aimed at investigating the efficacy of a single layer of reinforcement in improving the lo, ad-bearing capacity when it gets incorporated within the body of a model fly ash embankment slope. An increase in load bearing capacity due to the incorporation of reinforcement in the model slope was found by conducting laboratory tests. Experimental results were compared by numerical values obtained using software GEO5 and PLAXIS.