边坡降雨入渗的饱和-非饱和有限元数值分析

针对降雨入渗时边坡的稳定问题,运用饱和-非饱和渗流有限元法模拟降雨条件下土质边坡渗流场的变化情况.研究了降雨入渗情况下边坡内非饱和渗流场的变化以及渗流场的变化对边坡失稳的影响机理,结合工程边坡算例,进行了边坡内渗流场的数值模拟,得出了有意义的结论.     

蓄水池及排水管对边坡稳定性影响分析

本文模拟的是某边坡上的废弃蓄水池及排水管对边坡的稳定性影响。废弃的蓄水池在高降雨强度的情况下容易形成汇源积水,积水在边坡体内渗流,致使边坡的安全系数降低。运用有限元软件SEEP对某蓄水池的非饱和土边坡进行渗流模拟,分析了蓄水池积水渗流的渗流场及对边坡安全系数的影响,同时模拟了排水管堵塞与畅通的情况对边坡安全系数的影响。     

年平均降雨入渗补给对滨海含水层系统水位波动影响的解析研究

降雨入渗补给是影响滨海含水层系统水位波动的主要因素之一.本文建立了一个较为一般的滨海含水层系统模型.模型中不仅考虑了年平均降雨入渗补给对含水层系统水位波动的影响,同时也考虑了潜水含水层中地下水的波动及其通过半透层对承压含水层的越流补给.利用解析法分析了降雨入渗补给对潜水水位、承压水头和地下水海底排泄量的影响.     

基于RBF神经网络的边坡稳定性分析

为解决云南变电站山地建设中边坡稳定性难以分析的问题,开展了山地变电站的边坡状态检测与稳定性分析研究。运用RBF神经网络算法建立了具有预测能力的分析模型,将边坡压力预测值与监测值相互结合对比分析,并对山地变电站边坡的结构稳定性作出判定。从数据分析可以看出,此传感网络系统的搭建较为成功,在电磁干扰强、地质环境恶劣的工作条件下运行状态良好,达到了监测目的。采用基于RBF神经网络的边坡结构稳定性分析方式,能较好解决边坡稳定性预测问题。     

浅谈黄土边坡失稳机理及防治措施

根据黄土的工程特性,阐述了黄土边坡各种失稳破坏的特征,并简单分析了黄土边坡失稳原因和失稳机理,提出了对黄土边坡失稳破坏的防治措施.     

边坡稳定性分析方法及展望

边坡灾害给人类造成了不同程度的损失,其防护与治理是目前主要的研究课题.介绍边坡稳定性分析中的传统方法、数值模拟法、不确定性分析法,分析耦合作用、力学参数等对边坡稳定性的影响,总结三维评价方法和大数据的优势及不足,提出大数据下的边坡稳定性评价方法、复合方法以及BIM在稳定性分析中的应用,为边坡稳定性分析提供新的思路和方法.     

含水率对厚土坡变形影响的FLAC3D数值模拟研究

分析了不同含水量下黏聚力和内摩擦角的变化规律．通过选取不同含水量下的黏聚力和内摩擦角参数值建立数值模拟模型,模拟厚土坡损伤破坏的过程,以探求降雨入渗作用下厚土边坡的破坏机理。结果表明,含水率对边坡变形有较大影响．含水率对厚土坡变形的影响规律与其对黏聚力的影响规律相反,随含水率逐渐增大,厚土坡向临空面的变形呈先减小后增大的特征。     

含水率对厚土坡变形影响的FLAC^3D数值模拟研究

分析了不同含水量下黏聚力和内摩擦角的变化规律．通过选取不同含水量下的黏聚力和内摩擦角参数值建立数值模拟模型,模拟厚土坡损伤破坏的过程,以探求降雨入渗作用下厚土边坡的破坏机理。结果表明,含水率对边坡变形有较大影响．含水率对厚土坡变形的影响规律与其对黏聚力的影响规律相反,随含水率逐渐增大,厚土坡向临空面的变形呈先减小后增大的特征。     

基于PSO优化的神经网络在边坡稳定性评价中的应用

本文首先介绍基于PSO优化的BP神经网络算法;并在此基础上,考虑影响边坡稳定性分析的包括岩石容重、粘聚力、内摩擦角、边坡角、边坡高度、空隙水压力等各种自然因素,以文献中土质边坡工程的数据为例,用基于PSO优化的BP神经网络算法对边坡稳定性进行评价。最后将评价结果与传统BP方法计算结果进行逐一对比,结果证明该方法不仅能满足边坡稳定性评价的精度要求,而且还可以加快训练收敛速度,其泛化性能也比较好,使得边坡稳定性评价更为便捷迅速,从而证明该方法具有一定的推广应用价值。     

岩土工程专业综合性设计实验教学探索与实践

结合野外工程实际环境和需求,利用实验室可调设计实验优势,兼顾室内和野外特色,以分析研究边坡稳定性的影响因素为着眼点,进行综合性设计实验。通过模型化寻参、调参监测基本参数,探索了降雨与切坡条件下边坡性状的变化与稳定性。由模拟实验条件与工程实际相结合的综合性实验,同样可获取现场实用的工程性质,而且较高分辨率的模型实验条件设计,更有助于达到精准目的。     

A study on dynamic response of slopes under wave action using simulation tests

1. Introduction At present, the construction of large-scale reservoirworks has given rise to many large-scale reservoirareas, the stabilization of slopes in these reservoirdistricts will be influenced by water waves. Thecirculating hydraulic loading caused by the waveproduces a great force on the slope, and especiallyforms a vibration wave force on the boundary of water surface and the slope earth, and even breaks the water-soil interface, leading to the excess pore pressurechanging along diff…     

Coupled Numerical Analysis of the Stability Behaviour of Unsaturated Soil Slopes Under Rainfall Conditions

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…     

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.     

Aerodynamic modeling and stability analysis of a high-speed train under strong rain and crosswind conditions

With the development of high-speed train, it is considerably concerned about the aerodynamic characteristics and operation safety issues of the high-speed train under extreme weather conditions. The aerodynamic performance of a high-speed train under heavy rain and strong crosswind conditions are modeled using the Eulerian two-phase model in this paper. The impact of heavy rainfall on train aerodynamics is investigated, coupling heavy rain and a strong crosswind. Results show that the lift force, side force, and rolling moment of the train increase significantly with wind speed up to 40 m/s under a rainfall rate of 60 mm/h. when considering the rain and wind conditions. The increases of the lift force, side force, and rolling moment may deteriorate the train operating safety and cause the train to overturn. A quasi-static stability analysis based on the moment balance is used to determine the limit safety speed of a train under different rain and wind levels. The results can provide a frame of reference for the train safe operation under strong rain and crosswind conditions.     

微地形条件下地表填洼量计算方法研究

地表填洼量是地表相对低洼处蓄存的水量,与地表径流与土壤侵蚀过程有直接关系。本文通过模拟黄土坡耕地普遍采用的人工锄耕和人工掏挖耕作措施下地表特征,探讨了地表填洼量的计算方法。结果表明：地表洼地空间分布较随机,人工掏挖措施下呈斑点大而少,人工锄耕下斑点小而多的特征;地表填洼量与坡面洼地面积呈显著正变函数关系,可以作为研究区坡耕地上人工锄耕和人工掏挖措施下地表填洼量的计算公式。     

寒、旱、沙化黄土区高速公路边坡植被绿化技术研究

采用调查乡土种和当地已建高速公路边坡绿化情况相结合的方法,在对京大高速、得大高速、大同环城高速等边坡的绿化植物进行调查的基础上,筛选了适合寒、旱、沙化黄土区高速公路边坡植被绿化植物,认为柠条、沙棘、沙地柏等作为优势绿化植物较为科学。探讨了其育苗、栽植和管理技术,进而分析了其植被绿化效果。     

Phosphorus transport with runoff of simulated rainfall from purple-soil cropland of different surface conditions

We investigated the patterns of phosphorus transport from purple-soil cropland of 5° and 10° slopes with bare and vegetated surfaces, respectively. Each type of land was tested under a simulated moderate rainfall of 0.33 mm/min, a downfall of 0.90 mm/min, and a rainstorm of 1.86 mm/min. Runoff dynamics and changes in the export amount of phosphorus are influenced by the rainfall intensity, the slope and surface conditions of cropland. The vegetation diverts rain water from the surface into soil and helps the formation of a subsurface runoff, but has little influence on runoff process at the same sloping degree. Vegetated soil has a smaller phosphorous loss, particularly much less in the particulate form. A heavier rainfall flushes away more phosphorous. Rainwater percolating soil carries more dissolved phosphorous than particulate phosphorous. Understanding the patterns of phosphorous transport under various conditions from purple soil in the middle of Sichuan basin is helpful for developing countermeasures against non-point-source pollution resulting in the eutrophication of water bodies in this region that could, if not controlled properly, deteriorate the water quality of the Three Gorges Reservoir.     

论Geo—slope中背水面边界条件选取问题

对西安市某均质土坝,库水位在最高水位的工况下,用有限元分析软件Geo—slope计算分析了背水面不同高度的透水边界对渗流场和背水面边坡安全系数的计算结果的影响。结果发现,背水面透水边界在合理的高度以下上升时总流量、出溢流量、出溢口处水力坡降、背水面边坡安全系数增大;背水面透水边界在合理的高度以上升高时这四个代表值减小。说明了合理的背水面透水边界为各个流场代表值和边坡安全系数的极值点。