Intact soft clay’s critical response to dynamic stress paths on different combinations of principal stress orientation

Comprehensive tests on Hangzhou intact soft clay were performed, which were used to obtain the soils’ critical response to undrained dynamic stress paths under different combinations of principal stress orientation. The different combinations included cyclic principal stress rotation (CPSR for short), cyclic shear with abrupt change of principal stress orientation (CAPSO for short) and cyclic shear with fixed principal stress orientation (CFPSO for short). On one side, under all these stress paths, samples have obvious strain inflection points and shear bands, and the excess pore water pressure is far from the level of initial effective confining pressure at failure. Stress paths of major principal stress orientation (α) alternating from negative and positive have quite different influence on soil’s properties with those in which α is kept negative or positive. On the other side, due to the soil’s strongly initial anisotropy, samples under double-amplitudes CPSR and CAPSO (or single-amplitude CPSR and CFPSO) have similar properties on dynamic shear strength and pore water pressure development tendency when α is kept within ±45°, while have quite different properties when α oversteps ±45°.     

解读连战先生的民族情

文章试图从两方面解读连战先生深厚的民族情.这种民族情一方面来源于他的家族,连战的先祖到台湾死也不臣服清,曾祖父至父亲三代以各种形式坚持抗日及父母对他言传身教;另一方面与他早年在祖国大陆的生活经历有关,从他对抗战和日本的态度及祖国大陆寻踪等方面体现出来.     

Evaluation of ultimate bearing capacity of Y-shaped vibro-pile

Based on Mindlin stress solution, a numerical computational method was proposed to calculate the stresses in the ground induced by side friction and the resistance of Y-shaped vibro-pile. The improved Terzaghi’s and ЪерезанцевВГ’s methods for ultimate bearing capacity evaluation were proposed by considering the stress strength induced by friction resistance at pile head level of Y-pile. A new method to calculate the ultimate bearing capacity of Y-pile was also proposed based on the assumptions of soil failure mode at the tip of Y-pile and the use of Mohr-Coulomb soil yield criterion and Vesic compressive correction coefficient with the induced stresses in the ground. Based on the comparisons with the field static load test results, it is found that the improved Terzaghi’s method gives higher ultimate capacity, while the other two methods shows good agreement with the field results.     

Adhesion coefficient of automobile tire and road surface

The adhesion coefficient of automobile tire and road surface was analyzed and the formula about it was derived.Some suggestions about highway construction,driving safety of the drivers and the judgment of the traffic accidents were presented.The results show that the adhesion coefficient is a function with the extreme value.If there is atmospheric pressure in the tire,the load of the vehicle and the degree of the coarse on the road surface is not selected properly,it will reach the least and affect the safety of the running automobile.     

Effects of stress conditions on rheological properties of granular soil in large triaxial rheology laboratory tests

In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,the rheological tests were carried out.These experiment results showed that the stress conditions,especially the stress level were the critical influencing factors of the rheological deformation properties.Under the low stress level(S=0.1),the granular soil showed the elastic properties,and there was no obvious rheological deformation.Under the middle stress level(0.20.8) creep curves showed the non-linear viscous plastic rheological properties.Especially,under the stress level of S=1.0,the accelerated rheological phase of creep curves occurred at early time with a trend of failure.The stress level had obvious effects on the final rheological deformation of the soil sample,and the final rheological deformation increments nonlinearly increased with stress level.The final rheological deformation increment and step was little under low stress level,while it became large under high stress level,which showed the nonlinearly rheological properties of the granular soil.The confining pressure also had direct effects on final rheological deformation,and the final rheological deformation linearly increased with confining pressure increments.     

2008年我国房地产业的发展模式与市场把握

在深入市场调查、认真采集数据和科学分析研究的基础上,从我国新一年房地产业发展的"背景和环境"、"预期和责任"、"风险和影响"、"保障和创新"等方面进行阐述和论证.     

窃取商业秘密获得的专利权归商业秘密权利人所有——兼谈商业秘密构成要件和范围

中国加入WTO以后,知识产权的保护意识日益强化,作为知识产权范畴的专利权更是被人们普遍关注和重视.以"错案"为研究对象,运用商业秘密的有关理论以及保护商业秘密和专利权的有关法律制度,特别是从窃取商业秘密获得的专利权归谁所有的角度,对人民法院的判决进行了分析研究,指出了人民法院的判决是错误的,提出了窃取商业秘密获得的专利权归商业秘密权利人所有.这有利于人民法院公正司法,依法审判.     

从语气助词的角度浅析日语表达方式的特性

日语中有着十分丰富的语气助词,其虽然不具有实际的意义,然而通过语气助词,却能够流露出说话者的心情和感受,传递出不溢于言表的隐性含义,在日常的表达中扮演着十分重要的角色.从语气助词的角度,分析总结日语在表达上所具有的特性.     

Additional water use influencing strength and fluidity of recycled concrete

Through adding different additional water use,the compressive strength,splitting tensile strength and fluidity of recycled concrete of three aggregate combination forms were studied by experiment respectively.The experimental results show that with the increase of adding additional water use,the compressive strength and splitting tensile strength of recycled coarse aggregate concrete decrease,but that of recycled fine aggregate concrete and recycled all aggregate concrete increase firstly then decrease.When additional water use is added more 15% or 20% than that of basic ordinary concrete,the recycled coarse aggregate concrete and fine one can get pretty good fluidity.When it is added more 30%,the recycled all aggregate concrete has fluidity that is just satisfied.     

情趣与意象的契合——《逢雪宿芙蓉山主人》与《雪夜林边驻脚》之比较

通过分析《逢雪宿芙蓉山主人》与《雪夜林边驻脚》两诗的情趣和意象,发现两诗都采用了大致相似的意象.但由于诗人各自的文化传统的差异,在两诗中所传达的情趣却不同.然而,正是由于两诗各自在情趣与意象上的契合,才创造出了各自完美的诗境.     

三铺湖排涝泵站规模核算分析

文章以三铺湖排涝泵站为例,对缺资料地区排涝泵站规模的核算方法进行了探讨,经分析,三铺湖排涝泵站规模满足排涝区域10年、20年和50年一遇24h暴雨排涝的要求。     

关于规范县域农业排灌站用电的建议

国有、集体制排灌站在抗旱工作中发挥了重要的作用，但也暴露出一些问题。文章结合庐江县农业排灌站设施的基本状况，通过分析当前农业排灌站用电规范过程中存在的问题，从着眼长远和用电产权人的角度提出规范水利农业排灌站用电的建议。     

利用抽水试验测定防渗墙渗透系数

目前对防渗墙整体渗透系数的检测,工程极少采用。颍上县孟洼排涝站,利用抽水试验测定了防渗墙整体的渗透系数,避免了以点代面的弊端。     

陕甘宁盐环定扬黄工程泵站防腐加固处理对策研究

盐环定扬黄工程12座泵站中,有8座泵站出现渗漏侵蚀问题,严重威胁盐环定扬黄工程的正常运行．鉴于各泵站泵房底板渗漏腐蚀严重,为保证泵站设备的正常运行,自1996年开始就对泵站渗漏腐蚀的处理技术进行研究．通过对泵站枢纽周边及泵房基础范围内的水文地质基本条件的调查和现场测试,以及对工程地段混凝土结构构件和钢筋、金属结构构件等进行质量检测,查明了泵站枢纽工程的渗漏、侵蚀原因,渗漏途径,渗漏水力特征,渗漏对建筑物造成的危害;针对出现的不同危害采取了相应的处理措施;经多年运行效果良好,取得了显著的经济效益．该项研究成果实用性强、结论可靠,为大型扬水泵站工程防渗防腐处理、泵站防渗设计、施工等积累了经验．     

颍上县中小型灌溉排水泵站现状调查分析

文章调查了泵站工程运行情况、工程管理体制和运营机制现状,分析了泵站存在的问题及原因,提出了对策。     

新建桥墩对东围电排站排涝影响的试验研究

采用正态物理模型试验研究引水渠中新建桥墩对东围电排站排涝的影响。研究结果表明:常遇洪水时,新建桥墩引起电排站附近水位变化(上游渠道壅高、前池降低)较大,电排站前池流态明显恶化;大洪水时,新建桥墩客观上对水流起到了调节作用,使电排站自身设计问题造成的较差流态略有改善。综合来看,由于电排站在常遇洪水条件下运行更为频繁,新建桥墩造成的流态恶化对水泵机组的正常高效运行造成影响,给排涝带来一定的安全隐患。     

虹吸式出水流道泵站快速闸门运行新措施

分析了虹吸式出水流道泵站的快速闸门在超驼峰水位运行中存在的问题 ,提出采取快速闸门与压缩空气联合运用的新思路 .根据超驼峰水位的不同 ,在充分利用站内原有设备的基础上 ,建立不同型式的压缩空气系统 ,并根据具体情况对快速闸门进行配套改造 .通过压缩空气技术与快速闸门的配合 ,实现超驼峰水位下机组启动、事故停机以及倒灌等防洪排涝的技术措施     

抽水站厂房地下结构整体空间有限元分析

本文用８结点不协调三维实体单元，以陕西中部东雷抽黄工程某抽水站为例，对钢筋混凝土整体烧筑的厂房底板和侧墙及其地基进行了整体空间有限元分析研究。论述了抽水站厂房底板和侧墙结构模型化的有关问题，给出了不同的地基处理水平下结构及地基的受力和变形情况，可为抽水站厂房的结构设计和地基处理提供可靠的依据。     

大型泵站随机振动频谱分析

针对大型泵站运行中普遍存在的振动问题,建立了南水北调东线某大型泵站有限元模型,分析了泵站结构的自振特性并进行了共振校核。根据模型试验得到的测点压力脉动的频谱特性,在自振特性分析的基础上,采用了随机振动频谱分析方法计算了泵房的振动响应。计算结果对大型泵站的抗振安全评价有一定的借鉴意义。     

大中型泵站水泵吸水型式的选择

大中型泵站水泵吸水型式的合理选择和设计,直接涉及流道内水头损失的大小和流态的好坏,对水泵装置效率的影响起着非常重要的作用,同时也影响泵站的造价。本文结合对上海污水治理二期工程某泵站吸水型式选型进行的模型试验内容,对吸水管、肘形进水流道及钟形进水流道三种吸水型式进行一定的分析、比较,认为钟形进水流道是大中型立式泵站理想的吸水型式。