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.     

现场喷涂聚氨酯发泡外墙保温系统施工技术要点

结合中国农业银行青岛市分行营业楼扩建改造工程外墙外保温施工实例,介绍了现场喷涂聚氨酯发泡外墙保温系统施工技术要点,并且通过在施工现场对不同温度下聚氨酯发泡厚度的测量、聚氨酯发泡外墙保温系统与其他外墙保温系统对基层墙体要求的对比,得出了现场喷涂聚氨酯发泡外墙保温系统具有耐久性好、节能效果明显、施工简便等优点,为青岛市聚氨酯发泡外墙保温系统施工积累了经验.     

超高层建筑玻璃幕墙与主体结构穿插施工技术的应用

结合凯悦国际大厦超高层工程实例,通过研究玻璃幕墙与主体结构的施工技术,加强施工测量的控制和变形的监测,优化玻璃幕墙与主体结构之间的连接节点,合理划分施工区段,有效组织流水作业,使玻璃幕墙与主体结构的施工有条不紊地穿插进行,体现出超高层建筑的施工特点,解决安装玻璃幕墙对超高层工程的工期制约,整体建筑效果美观.     

墙梁在设计及施工中应注意的问题

通过对某墙梁裂缝的观察及设计施工的调查,在按实际施工情况进行分析的基础上,对墙梁安全进行评价,并提出了墙梁设计施工中应注意的问题。本文对墙梁按照现行砌体规范进行逐条分析,并参照规范中墙梁要造要求,通过对墙梁作一些合理的假定来建立满足墙梁构造条件的计算模型,经简化假定后,墙梁计算结果满足强度,变形要求,从而经分析得出墙梁裂缝是由于托梁变形及粉剧层太厚造成的,只影响美观,不影响正常使用要求,所以,在墙梁设计中,要明确混凝土及砌体材料强度,明确墙梁构造措施及施工方法。     

窗传热损失的计算方法

由窗洞口引起的传热损失不仅同窗构造有关,还同与其相连续的构造及连接方式有关,应用自编的二维计算软件,计算不同构造形式的窗洞口的传热损失,并引进线传热系数的概念对计算进行简化,同时给出不同结构墙体及不同窗户类型情况下整窗传热系数,以供设计者参考。     

混凝土剪力墙新型穿墙螺栓的应用

介绍一种新型穿墙螺栓及配件在混凝土剪力墙施工中的应用 ,从而使混凝土剪力墙模板的支设较为方便 ,同时为施工企业在混凝土剪力墙施工中增效节支     

外墙外保温施工组织与质量控制

文中介绍了外墙外保温施工前应做的施工组织与施工准备工作以及几种常见饰面层外保温体系的施工方法和质量控制。     

平原水库防渗墙的应力分析

采用非线性有限元方法,对某平原水库防渗墙的应力进行了分析.计算中考虑了坝体的施工过程、水压力的升高过程、先筑坝后建墙和先建墙后筑坝两种不同的施工顺序,计算结果表明墙体的强度是有保证的.     

中小尺寸竖井圆形地下连续墙的施工监测与数值分析

基于工程实例,对中小尺寸圆形地下连续墙的施工过程中墙体应力、钢筋应力、墙侧土体压力等参数监测并进行分析。采用有限元软件Abaqus建立该竖井施工过程的数值模型,研究结果表明:中小尺寸圆形地下连续墙纵向截面不存在明显的受拉区和受压区,整个墙体表现为受压状态。同时,墙体的入土深度对墙体水平位移、墙侧土压力的影响很小。中小尺寸圆形地下连续墙结构设计不需要采用传统的竖向弹性地基梁法确定结构配筋和入土深度。由于墙体自稳性强、刚度高,顺做法与逆作法的弯矩与剪力相似,在保证安全的状况下,可使用顺作法施工提高施工速度。     

地下室墙体的施工技术

地下室现浇墙体(剪力墙)施工中,极易发生墙面垂直度偏差大、胀模、墙板下部“烂根”和墙面出现蜂窝麻面等质量问题。如何解决此类质量问题,成为地下室墙体施工控制的重点。本文采用大板支撑体系及对拉螺栓加固等方法,并严格控制施工工艺,基本消除了胀模、烂根等质量问题。     

地连墙钢筋笼的吊装技术

地铁车站地连墙钢筋笼一般长度长,重量较大且形状各异,整体刚度较小,是车站施工现场危险性较大工程之一.结合苏州地铁月亮湾车站地下连续墙施工,简要分析地下连续墙钢筋笼吊装施工技术及难点,通过分析重点阐述起吊吊点位置确定、吊环强度验算、钢丝绳强度验算,为确保地下连续墙钢筋笼吊装施工安全起到一定指导作用.