麦秸秆石灰桩条形基础两侧加固法

基础两侧加固比其他方法简单、方便,但国内外基础两侧加固理论研究进展和试验研究情况资料较少。J．N．MandalandV．R．Manjuath做了条形基础两侧竖向加筋砂土地基室内模型试验,研究发现在每形基础两侧加筋可以明显提高地基承栽力,减小基础的沉降量。并且这种方法在加固既有建筑方面较容易实现。但对于经济不发达的村镇．选用钢筋或钢筋混凝土桩作为加筋体都超过了农民的承担水平。选择一种价格便宜、易得的加筋材料是解决既有村镇建筑地基基础加固问题的关键。2007年天津城建学院的柴寿喜教授成功研究出麦秸秆耐腐蚀技术．并将防腐处理后的麦秸秆作为加筋材料引入加筋土技术领域中。综合参考上述两种方法资料,将两种方法结合应用．将防腐处理后的麦秸秆作为加筋材料．以桩体的形式布置在条形基础两侧对既有村镇建筑地基基础进行力口固。     

深层搅拌石灰桩加固软土地基的探讨

针对高等级公路涵洞等结构物置于软弱地基上的情况，提出采用深层搅拌石灰桩的方案，阐述了其机械施工及强度形成机理，指出该方法具有设备简单，施工方便，经济效益好的特点。     

石灰粉煤灰桩加固技术在软弱地基中的应用

本文介绍了建筑工程中应用石灰粉煤灰挤密桩加固软土地基的设计、施工全过程。加固后的复合地基通过静载测定的资料，借均质弹性半无限体理论公式计算出变形模量Ｅ０及压缩模量Ｅｓ，并按强度及变形控制原则，提出了加固地基的承载力标准值，该值较原土地基提高３倍多。     

六层住宅楼锚杆静压桩加固纠偏的实践

1 工程概况 杭高苑1号住宅楼为六层砖混结构,条形基础,采用搅拌桩加固地基,搅拌桩有效长度4.9m,置换率为15％,复合地基设计承载力为120kPa。该楼于1998年12月6日竣工,但因诸多因素产生了较大的差异沉降,根据1999年11月8日的实测结果,楼房向北倾斜,西侧倾斜率为5.1‰,东侧倾斜率为     

住宅楼基础加固的处理方法

1 工程概况 广州市花都区某住宅楼位于花都区建设北路,系8层钢筋混凝土结构。该楼平面尺寸是60m×12m,基础形式为柱下条形基础,基础埋深为2.5m。该楼始建于1998年底,1999年3月基础竣工,1999年12月工程总体竣工。工程竣工后不久,即发现楼房基础不均匀沉降,后在沉降的一侧采用灌水泥浆加固地基,但基础仍未稳定,据实测结果,最大沉降为一天18mm。显然,原有基础未能达到设计承受力是导致房屋下沉的主要原因。     

树根桩在厂房基础加固中的应用

通过上海市北工业新区一幢厂房基础加固工程实例,介绍了树根桩的应用范围、工作机理,以及树根桩的施工工艺和施工中应注意的问题,总结了树根桩加固技术的优点。实践证明该技术用于地基加固、托换等方面具有较高的实用价值,是值得推广的地基基础加固处理方法。     

石灰砂桩加固湿陷性黄土地基机理探讨

通过对黄土湿陷性成因的分析,对石灰砂桩加固黄土湿陷性地基的过程分成三个阶段进行挤密分析,得到了其加固效应的表达式,最后,通过对加固前后的受力机理和现场浸水试验的P—S曲线的研究,进一步验证了石灰砂桩在加固湿陷性黄土地基的优越性和可行性。     

石灰桩加固油罐软土地基

本文介绍国内首次用石灰桩加固六座2000m~3油罐软土地基,并经投产三年证明运行良好的工程实例、结合工程进行了石灰桩复合地基载荷试验、轻便触探试验和无侧限抗压强度试验。最后,介绍了该工程的设计计算结果和沉降实测结果,对进一步研究石灰桩设计方法和工程实践有一定的作用。     

Causes of structural deformations of an apartment building on weak foundations in Verkhnekamsk

The results of monitoring are analyzed to ascertain the causes of structural deformation and settlement nonuniformity of an apartment building on pile foundations. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 19–20, September–October, 1999.     

Delayed installation of piles in consolidating soil

The current general accepted view is that the delayed installation of piles after the commencement of consolidation leads to a reduction of drag load acting on piles. Despite the extensive studies reported in the literature, no work that focussed on the quantitative effect of delayed installation of piles after the commencement of the consolidation on pile behavior was reported. A study on the effect of the delayed pile installation after the commencement of the consolidation is undertaken using a load transfer theory. Pile-soil slip is accounted for by limiting shear stress at the pile-soil interface to the average undrained shear strength of the consolidating soil. The effect of pile-soil slip in limiting the drag load is accounted for once the location of the neutral plane resulting from the delayed pile installation after the commencement of the consolidation is known. Contrary to the current generally accepted understanding that delayed installation of piles after the commencement of the consolidation will lead to a reduction of drag load on such piles, the present study finds that the drag load on piles may not be reduced for consolidating soft clay with two ways drainage or one way bottom drainage conditions.     

降低钻孔灌注桩砼用量和水泥含量的探讨

分析降低钻孔灌注桩砼用量和水泥含量的可能性，提出相应的工艺技术措施。     

复合地基设计问题探讨

复合地基在工程上已得到广泛的应用，但在设计上还存在一些值得研究的问题。就复合地基设计中遇到的问题，提出一些看法和意见：1）复合地基的形成条件；2）承载力的表达式；3）关于沉降计算；4）处理的深度和范围；5）关于垫层的设置等。     

浅议某高层住宅楼主体工程施工技术方案选择

探讨了高层框剪住宅主体结构模板、混凝土的施工方案选择和质量预控,重点介绍了施工前期模板、混凝土浇筑的方案选择和经济技术比较,确定了工程实例的主体阶段模板、混凝土工程的施工方案,以达到适合工程实际需要的最佳经济技术方案。     

高层清水混凝土建筑:清华东路公寓、大学生公寓

清华东路公寓、大学生公寓工程，位于北京市海淀区清华东路南侧，学院路西侧，总占地面积12490m^2，工程用户为中国矿业大学北京分校，作为学生宿舍楼使用。总建筑面积62650m^2，是一栋高层清水混凝土建筑。     

Design approach to a method for reinforcing existing caisson foundations using steel pipe sheet piles

This paper proposes a steel pipe sheet pile (SPSP) reinforcement method for existing caisson foundations in water. The technique involves driving SPSPs around the caisson foundation and connecting them to it with reinforcing footing. To support the rational design of reinforcements using this method, the following factors influencing the technique׳s effectiveness and related mechanical behavior should be considered: (1) the conditions of the caisson/SPSP reinforcement footing connection; (2) the caisson/SPSP flexural rigidity ratio; (3) the distance between the caisson and the SPSP wall; and (4) the pile length. However, as the influence of these factors on the reinforcement effect and mechanical behavior has not yet been clarified, the current method has no standardization for the concept of the load transfer mechanism in reinforced foundation systems, and the ultimate lateral bearing capacity of existing caissons has been largely ignored in previous construction. This paper describes centrifuge model tests and three-dimensional elasto-plastic finite element total stress analysis conducted in relation to real cases in order to identify a more effective and rational reinforcement structure. The static lateral bearing capacity and seismic performance of reinforced foundations were investigated, and the following factors were considered: (1) the conditions of the caisson/SPSP reinforcement footing connection; (2) the caisson/SPSP flexural rigidity ratio; and (3) the pile length. Finally, a structural design flow is proposed based on the experimental and numerical simulation results. A chart to facilitate determination of appropriate reinforcement structures is also presented.     

Transmission of vertical oscillations from machine foundations to adjacent building foundations

Test results are presented for the transmission of harmonic vertical oscillations from machine foundations to adjacent frame foundations and building walls, and an equation is proposed for determination of the coefficient of this transfer. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 3, pp. 8–10, May–June, 1998.