基坑工程有限元数值分析结果的可视化表达   总被引：5，自引：1，他引：4  

武亚军  栾茂田 《岩土力学》2005,26(5):813-816

针对基坑工程的施工力学特性,采用双扫描线提出有限元数值计算结果可视化后处理方法,在阐述了双扫描线方法的基本原理和实现方法的基础上,编制了可视化后处理类程序,并整合到所开发的基坑开挖有限元分析程序中。最后,对某一开挖基坑计算结果进行了处理,得到了满意的效果。  相似文献   

川藏公路某滑坡抗滑桩工程效果的有限元后评价     

郑明新 《岩土力学》2009,30(6):1782-1786

在对川藏公路二郎山k2730段Ⅰ# 滑坡及其抗滑结构现场调研的基础上,依据预应力锚索抗滑桩中桩土相互作用特征引入接触单元,并改进了PCEP2D有限元软件,将滑坡和抗滑桩结构相互作用作为整体,对桩体位移、桩身弯矩、锚固段桩体接触单元应力分布做了分析。与传统计算方法、实际监测资料进行对比,结果表明,该滑坡治理工程效果较好。  相似文献   

Quasi‐static and pseudo‐dynamic testing of unbonded post‐tensioned rocking bridge piers with external replaceable dissipaters     

Dion Marriott  Stefano Pampanin  Alessandro Palermo 《地震工程与结构动力学》2009,38(3):331-354

It has been well documented that following a major earthquake a substantial percentage of economic loss results from downtime of essential lifelines in and out of major urban centres. This has thus led to an improvement of both performance‐based seismic design philosophies and to the development of cost‐effective seismic structural systems capable of guaranteeing a high level of protection, low structural damage and reduced downtime after a design‐level seismic event. An example of such technology is the development of unbonded post‐tensioned techniques in combination with rocking–dissipating connections. In this contribution, further advances in the development of high‐performance seismic‐resistant bridge piers are achieved through the experimental validation of unbonded post‐tensioned bridge piers with external, fully replaceable, mild steel hysteretic dissipaters. The experimental response of three 1 : 3 scale unbonded, post‐tensioned cantilever bridge piers, subjected to quasi‐static and pseudo‐dynamic loading protocols, are presented and compared with an equivalently reinforced monolithic benchmark. Minimal physical damage is observed for the post‐tensioned systems, which exhibit very stable energy dissipation and re‐centring properties. Furthermore, the external dissipaters can be easily replaced if severely damaged under a major (higher than expected) earthquake event. Thus, negligible residual deformations, limited repair costs and downtime can be achieved for critical lifeline components. Satisfactory analytical–experimental comparisons are also presented as a further confirmation of the reliability of the design procedure and of the modelling techniques. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

矿床变化与保存的研究内容和研究方法   总被引：22，自引：1，他引：21       下载免费PDF全文

翟裕生  邓军 《地球科学》2000,25(4):340-345

矿床是复杂地质作用的结果.矿床形成后又经历不同形式和不同程度的变化.由于已发现矿床的大多数是在其形成后经过变化而保存下来的, 因此矿床学研究应兼顾矿床的形成(成因) 和矿床的变化、保存(产出) 两个方面, 以提高矿产预测的能力.矿床变化与保存的研究内容包括: (1) 控制要素; (2) 变化、改造的过程; (3) 变化、改造的产物; (4) 不同矿床类型的变化; (5) 不同时-空域中矿床的变化; (6) 矿床保存条件.研究成矿后变化的基本方法有: 地质构造制图、地球化学分析和模拟实验.提出要研究和建立矿床的变化、改造模型; 将矿床演变作为含矿区域地质历史的一个环节, 将矿床个体变化研究与区域成矿系统演变相结合.矿床变化研究既有利于矿产预测和勘查, 又可为改善矿区和区域生态环境提供基础资料.   相似文献   

浙江苍南瑶坑碱性花岗岩的地球化学及其成因类型   总被引：10，自引：0，他引：10  

蟹泽.聪史 《岩石矿物学杂志》2000,19(2):97-105

瑶坑岩体位于浙闽交界的苍南县马站镇北侧,侵入于早白垩世石帽山群下组地层中。岩石发育典型的文象结构和晶洞 构造,含有特征的钠铁闪石碱性铁镁矿物,主要矿物组合为石英＋条纹长石＋钠铁闪石＋黑云母＋萤石、锆石。化学成分上,该岩体富硅、碱、贫钙、镁,分异指数和氧化指数高,富Ｒｂ、Ｔｈ、Ｇａ,贫Ｓｒ、Ｂａ,Ｇａ／Ａｌ比值大,富轻稀土,Ｎｂ、Ｚｒ、Ｈｆ等高场强元素含量高,Ｃｒ、Ｃｏ、Ｎｉ、Ｖ等过渡族元素显著亏损  相似文献   

MULTI-PERIODIC COLLISIONAL PROCESS BETWEEN INDIAN AND ASIAN CONTINENTS:A CASE OF EASTERN HIMALAYAN SYNTAXIS AND HENGDUAN MOUNTAINS   总被引：1，自引：0，他引：1  

Zhong Dalai  Ding Lin  Zhang Jinjiang  Ji Jianqing 《地学前缘》2000,(Z1)

MULTI-PERIODIC COLLISIONAL PROCESS BETWEEN INDIAN AND ASIAN CONTINENTS:A CASE OF EASTERN HIMALAYAN SYNTAXIS AND HENGDUAN MOUNTAINS1　ZhongDalai,DingLin .RisingprocessoftheQinghai Xizang (Tibet) plateauanditsmechanism[J].ScienceInChina (se riesD) ,1996 ,39(4) :36 9～ 379. 2　DingLin ,ZhongDalai,PanYusheng ,etal.Fission trackevidenceforNeogenetoQuaternaryupliftoftheeasternHi malayansyntaxis[J].ChineseScienceBulletin ,1995 ,40 (16 ) :…  相似文献   

冰后期最大海侵以来长江,钱塘江河口湾发育过程的沉积动力学研究   总被引：2，自引：0，他引：2  

朱玉荣 《海洋地质与第四纪地质》2000,20(2):1-6

利用二进流数学模型对冰后期最大海侵以来５期古岸线与现在岸线条件下古长江河口湾、古钱塘江河口湾及其邻近海域的主要水动力Ｍ２潮流场进行了数值模拟;在此基础上,分别计算了进入不同时期潮流场的７种粒径泥沙的潮平均单宽悬移输沙率与扒移输沙率及其相应的输沙率散度,据此得出不同粒径泥沙在当时潮流场中的悬移与推移输过趋势,划分了海 淤积区与冲刷区 同时期的潮流场作用下,长江入海泥沙除最大限度地沉积在古长江河口湾（  相似文献   

New Europe; a political geography of fragmented unity     

Herman van der Wusten 《GeoJournal》2000,52(2):87-92

The Europe of the European Union has an ever more important set of policy arenas at the European level, still strong states, and a series of strong regions that put their demands on the table. The EU is deeply involved in its immediate surroundings and it acts in conjunction with member states in global policy forums. Europe is an unprecedented example of multi-level, multi-sector governance. Europe has been politically re-ordered on a number of occasions and this is one of them. In the current debate abundant use is made of historical examples. The new Europe is in need of institutional re-structuring. Following the traditions of European cooperation this is very slow in coming. Geographers should particularly be concerned with the consequences of terrioriality at several scales simultaneously.  相似文献   

中国新元古代大陆拼合与Rodinia超大陆   总被引：46，自引：0，他引：46  

郭进京  陆松年 《高校地质学报》1999,5(2):148-156

在对前人研究成果分析的基础上,结合对中祁连块块前寒武纪基底的研究,认为新元古代（1000－9000Ma）中国各主要克拉通地块（包括华夏地块、扬子地块、华北地块、阿拉善－祁连－柴达木地块、塔里木地块）曾经通过晋宁期碰撞拼合带发生过一次全面的多块体复杂拼贴。这次拼贴过程是全球性新元古代格林威尔碰撞造山作用和Rodinia超大陆形成过程的一个组成部分。新元古代拼合的古中国地块在当时位于Rodinia超大陆中北部澳大利亚、劳伦提亚和西伯利亚克拉通地块之同。中国的各主要克拉通地块只不过是巨型格林威尔碰撞带之中夹裹的一些小型地块,且都处于新元古代晚期Rodinia超大陆破裂的中心部位,这些正是中国大陆上克拉通地块活动性大的早期地质背景。  相似文献   

Near-infrared photometry of the final helium shell flash object V4334 Sagittarii     

U. S. Kamath  N. M. Ashok 《Monthly notices of the Royal Astronomical Society》1999,302(3):512-514

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