单一滑面边坡的非稳定蠕变模型分析   总被引：3，自引：0，他引：3  

何峰  王来贵  刘向峰 《中国地质灾害与防治学报》2005,16(4):29-31

对单一滑面边坡的非稳定蠕变分析是边坡稳定性研究的基础。文中对岩质边坡单一滑面的流变变形机制进行了分析，提出了一种能较好反映这一变形机制的非稳定蠕变模型。特别是描述单一滑面边坡的非稳定蠕变破坏阶段，并对其稳定性进行了讨论。结合一些工程实例进行了对比验证，为滑坡灾害的预测和防治提供依据。  相似文献   

燕山水库坝基防渗墙优化设计   总被引：1，自引：0，他引：1  

张宜虎  尹红梅  杨裕云  王亮清 《岩土力学》2005,26(7):1161-1164

因现场资料不足或分析手段落后等原因,当前进行水库坝基防渗墙设计,往往存在过于保守的倾向。以河南省燕山水库为例,基于优化设计的思路,采用目前较为成熟的二维有限单元法,对不同防渗条件下的坝基渗流场分别进行了模拟,并将计算所得比降、流量与允许比降、允许流量做了对比,从定量的角度提出了既安全、又经济的防渗方案:防渗墙厚度取0.8m,深度取打入破碎带5m。  相似文献   

悬臂式支护结构设计中土层参数分算与合算的探讨   总被引：2，自引：0，他引：2  

杨佳平  郑毅  徐家斌 《世界地质》2005,24(3):293-296

针对基坑支护设计中土层参数的选取问题,以悬臂桩支护结构为例,在基坑支护设计中土层参数分别采用分算与合算两种方法计算,结果表明：当各土层差异较大时,采用两种方法计算得出的最大弯矩和埋深相差较大;采用合算的结果较小,分算的结果较大.采用m法对分算与合算的设计计算结果进行悬臂桩的位移和转角的计算,其结果都能满足工程技术相关规范要求.但合算的计算结果更经济,更符合工程实际需要.  相似文献   

滑坡治理中格构锚固结构的解析解分析   总被引：17，自引：0，他引：17  

许英姿  唐辉明 《地质科技情报》2002,21(3):89-93

在分析格构锚固结构受力的基础上 ,将格构梁简化为受集中力作用的弹性地基上的梁 ,提出了格构锚固结构的力学模型 ,利用 Winkler弹性地基上梁的解析解对格构梁进行了内力和变形的分析 ,发现格构梁的受力状况受弹性特征λ、梁格间距 ls以及悬臂长度影响 ;建议梁长 l与λ宜满足 lλ≥ 2π;采用较小间距的格构梁以及小吨位锚索 ,间距宜满足 lsλ<π/ 2 ,悬臂长度取 (0 .3～ 0 .5 ) ls,并将分析结论应用于三峡库区巴东太矶头东滑坡治理工程的设计中  相似文献   

冲击压实技术在路基工程中的应用研究     

吴家祥  苏传福 《安徽地质》2002,12(4):323-326

通过介绍冲击压实机基本原理,分析冲击压实技术特点,结合工程实例,表明冲击压实技术具有减少路基工后沉降、提高路基整体强度及加固软弱地基作用效果显著,同时填石路堤施工工艺的改进和压实标准进行了研究.  相似文献   

软基上高速铁路路桥过渡段的技术措施研究   总被引：2，自引：0，他引：2       下载免费PDF全文

杨广庆  彭华  刘建坤 《探矿工程》2002,(5):13-15

通过对高速铁路路基与桥梁过渡段动力特性分析，指出结构物沉降差是导致轨面不平顺的主要因素。分析了沉降差产生的原因，提出了软基上路桥过渡段的结构设计方案，并对其施工方法及质量检测标准进行了探索。  相似文献   

均匀土-箱基-结构相互作用体系的计算分析   总被引：4，自引：0，他引：4  

李培振  吕西林  陈波  陈跃庆 《地震工程与工程振动》2002,22(5):115-121

采用通用有限元程序ANSYS，针对捱动台试验中的均匀土-箱基-结构试验进行了三维有限元分析，计算中土体的本构模型采用等效线性模型，利用面-面接触单元考虑土体与基础交界面的状态非线性。计算表明，基础底面和土体发生滑移，基础侧面和土体之间发生了滑移和脱离，上部结构柱顶加速度反应主要由基础转动引起的摆动分量组成，通过与试验结果的对照研究，二者得出的规律基本一致，验证了采用的计算模型与分析方法的合理性，为进一步计算研究和实际工程应用奠定了基础。  相似文献   

Torsional vibrations of elastic foundation on saturated media     

Longzhu Chen  Guocai Wang   《Soil Dynamics and Earthquake Engineering》2002,22(3)

A comprehensive analytical solution is developed to examine the torsional vibration of an elastic foundation on a semi-infinite saturated elastic medium for the first time. First, the governing equations of saturated media are solved by use of Hankel transform techniques. Then, based on the assumption that the contact between the foundation and the half-space is perfectly bonded, this dynamic mixed boundary-value problem can lead to dual integral equations, which are further reduced to the standard Fredholm integral equations of the second kind and solved by numerical procedures. Numerical examples are given at the end of the paper. The numerical results indicate that the response of the elastic foundation strongly depends on the material and geometrical properties of both the saturated soil-foundation system and the load acting on the foundation. In most of the cases, the dynamic behavior of an elastic foundation on saturated media significantly differs from that of a rigid plate bearing on the elastic half-space.  相似文献   

Transient foundation solution of saturated soil to impulsive concentrated loading     

X. L. Zhou  J. H. Wang  J. F. Lu 《Soil Dynamics and Earthquake Engineering》2002,22(4)

The transient dynamic response of saturated soil under suddenly applied normal and horizontal concentrated loading is studied in this paper. The behavior of saturated soil is governed by Biot's consolidation theory. The general solutions for Biot equations of equilibrium are derived in terms of displacements and variations of fluid volume, using Laplace–Hankel integral transforms. The solutions in the time domain can be evaluated by numerical inverse Laplace–Hankel transforms. Selected numerical results for displacements, stresses, and pore pressures are presented. Comparisons with existing closed-form solutions for the elastic half-space are made to confirm the accuracy of the present solutions. The solutions can be used to study a variety of transient wave propagation problems and dynamical interactions between saturated soil and structures.  相似文献   

Hybrid vibration experiments with a bridge foundation system model   总被引：3，自引：0，他引：3  

Hiroshi Kobayashi  Keiichi Tamura  Shunsuke Tanimoto 《Soil Dynamics and Earthquake Engineering》2002,22(9-12):1135-1141

In order to improve seismic design technology of bridges, it is necessary to evaluate the vibration characteristics of a bridge–soil system that consists of soil, foundation structure, pier and superstructure. However, there have been few experimental studies on seismic behavior of bridge–soil system. In this paper, we conducted the hybrid vibration experiment on seismic behavior of bridge–soil system, and examined the applicability of hybrid vibration experiment to study seismic response of bridge–soil system. Based on the experiment results, seismic response of bridge was quantitatively studied.  相似文献