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ANALYSIS AND TREATMENT OF A QUALITY PROBLEM OF COMPOSITE FOUNDATION OF CFG PILES FOR BUILDING 4 IN XIZHAOSI RESIDENTIAL AREA
北京夕照寺小区4#住宅楼CFG桩复合地基质量问题分析处理

ZHU Zhi-gang,
朱志刚

岩石力学与工程学报 , 2005,
Abstract: Data obtained from composite foundation monitoring showed that the allowable bearing load of some cement flyash gravel(CFG) piles for building No.4 in Xizhaosi residential area did not meet the requirements of engineering design. After re-exploration and careful analysis,it was found that the sand soil under the bottom of the pile and around the pile was disturbed during the construction of CFG piles. This paper aims at reminding engineers and technicians of elaborate design and construction of CFG pile to ensure quality in composite foundation design and construction.
The Intuitive Logarithm  [PDF]
Henryk Trappmann
Mathematics , 2010,
Abstract: We introduce the intuitive method to select an analytic Abel function of an analytic function f at a non-fixpoint. Due to the complexity of this method by involving matrix inversion of increasing size there is little known about its convergence. We show its convergence in the simplest but still complicated case f(x)=bx. We show that the obtained Abel function is, as expected, the logarithm to base b, independent on its development point. As a by-product we obtain a new polynomial approximation sequence for the logarithm to base b.
The Weighted CFG Constraint  [PDF]
George Katsirelos,Nina Narodytska,Toby Walsh
Computer Science , 2009,
Abstract: We introduce the weighted CFG constraint and propose a propagation algorithm that enforces domain consistency in $O(n^3|G|)$ time. We show that this algorithm can be decomposed into a set of primitive arithmetic constraints without hindering propagation.
Funny Problems in Intuitive Topology  [PDF]
Ruhollah Tavakoli
Mathematics , 2010,
Abstract: The goal of this article is to introduce some beautiful known riddles in intuitive topology; hoping to make at least some fun for the reader.
CFG桩基坑内施工对基坑周围环境稳定性的影响
Influence of CFG Piles Construction in Foundation Piton Surrounding Environmental Stability
 [PDF]

刘熙媛,毛清志,付士峰,胡世飞
- , 2015, DOI: 10.3969/j.issn.1000-0844.2015.03.0834
Abstract: 在地下工程中,由于天然地基承载力不足,带有地下室的主体结构采用CFG桩复合地基。因为CFG桩长螺旋钻施工设备限制,地下室底板下的CFG桩必须在深基坑开挖一部分后进行施工。在某深基坑工程中,随着CFG桩的施工,基坑周围地表出现明显开裂现象。为探究其原因,结合该基坑工程实例,利用FLAC3D软件,通过数值模拟分析考虑渗流作用下CFG桩基坑内施工对基坑周围地表变形的影响规律,并把计算结果同实际监测数据进行对比分析。研究结果表明:CFG桩在部分开挖基坑内施工的快速取土作用对基坑内被动土压力区产生扰动,削弱原有的被动土压力,导致基坑周围土体变形。基坑周围地表变形的影响范围超出2倍基坑深度的监测范围,因此,部分开挖基坑内施工CFG桩的基坑工程周围环境的监测范围应在满足国家规范要求的基础上适当增大。根据计算结果建议类似基坑工程监测范围距基坑边缘的距离采用基坑开挖深度与基坑底面以下CFG桩长之和。类似基坑工程设计应加大支护结构和止水帷幕深度,施工时从基坑内部向外部隔桩跳打,并适当增加工期,将有利于降低由于CFG桩基坑内施工对基坑周围土体的影响。
In underground engineering,the main structure with the basement is built with CFG pile composite foundation because the natural ground bearing capacity is insufficient.Because the construction length of the CFG pile is limited by the spiral drilling machine,CFG piles under the floor of the basement must be constructed after a part of the deep foundation pit is excavated.In certain deep foundation pit engineering with CFG pile construction,there is an obvious crack phenomenon on the ground surface around the foundation pit.In order to explore its causes,the deformation characteristics of the foundation pit are analyzed considering the action seepage when CFG piles are constructed in the foundation pit after part excavation.The analysis uses FLAC3D as the numerical simulation tool. The calculated results are compared with actual monitoring data of the foundation pit.Finally,the causes of cracks in the ground around the foundation pit during construction are studied.The results show that the rapid sampling effect in the foundation pit decreases the earth pressure in the passive zone of the foundation pit when CFG piles are constructed in the foundation pit after part excavation.The effect scope of earth deformation around a foundation pit is beyond the scope of monitoring which is twice the depth of the foundation pit.Therefore,the scope of monitoring of the ground deformation around similar foundation pits should increase appropriately on the basis of meeting the requirements of the National Standard.According to the calculation results,it is suggested that the scope of monitoring in similar foundation pit engineering should adopt the sum of the foundation pit excavation depth and the CFG pile length at the foundation pit bottom.Similar foundation pit engineering design should increase the length of the support structure and the depth of the waterproof curtain.Construction of CFG piles in foundation pits should be from the inside to the outside edge of the foundation pit with piling every a few piles.The construction time should increase appropriately.These measures will help to
Constructing physically intuitive graph invariants  [PDF]
Terry Rudolph
Physics , 2002,
Abstract: In this brief note I try to give a simple example of where physical intuition about a collection of interacting qubits can lead to the construction of "natural" versions of what are, generically, quite abstract mathematical objects - in this case graph invariants. This note is written primarily for physicists who do not want to go through the painful process of trying to understand Ed Witten's vastly more complicated construction of physically intuitive knot invariants, but who'd like some idea of how physical intuition can play a role in such things.
Intuitive decisions on the fringes of consciousness  [PDF]
Mark C. Price,Elisabeth Norman
Judgment and Decision Making , 2008,
Abstract: Decision making research often dichotomises between more deliberative, cognitive processes and more heuristic, intuitive and emotional processes. We argue that within this two-systems framework (e.g., Kahneman, 2002) there is ambiguity over how to map the System 1/System 2 axis, and the notion of intuitive processing, onto the distinction between conscious and non-conscious processes. However the convergent concepts of experience-based metacognitive judgements (Koriat, 2007) and of fringe consciousness (Mangan, 1993) can clarify intuitive processing as an informative extit{conscious feeling} without conscious access to the antecedents of the feeling. We stress that these intuitive feelings can be used to guide behaviour in a controlled and contextually sensitive manner that would not be permitted by purely non-conscious influences on behaviour. An outline is provided for how to empirically recognise these intuitive feelings. This is illustrated with an example from research on implicit learning where intuitive feelings may play an important role in peoples' decisions and judgements. Finally we suggest that our approach to understanding intuitive feelings softens rather than reinforces the two-systems dichotomy.
武广高铁CFG桩复合地基工后沉降影响因素
Factors Influencing Subgrade Post-Construction Settlement of CFG Pile Composite Foundation in Wuhan-Guangzhou High-Speed Railway
 [PDF]

张峰, 刘莹, 许兆义, 李志义
ZHANG Feng
, LIU Ying, XU Zhaoyi, LI Zhiyi

- , 2015,
Abstract: 摘要: 为了研究软土地区高速铁路CFG(cement flyash gravel)桩复合地基工后沉降,以武广客专试验段为例,基于有限元理论,借助ABAQUS软件,对多个影响CFG桩复合地基工后沉降的因素进行数值模拟,分析各因素对其沉降的影响程度和规律,确定控制沉降量的主要因素.研究结果表明:增大桩的弹性模量或桩径,桩土应力比均增大;增大垫层厚度,桩土应力比减小;采用钢筋混凝土管桩和CFG桩组合时,在CFG桩桩顶的最大沉降为2.01 mm,与全为管桩的情况相比,不均匀沉降减小了46.5%.
Abstract: In order to study the post-construction settlement of CFG(cement flyash gravel)pile composite foundation of high speed railway in soft soilI areas, finite element numerical simulations were made using ABAQUS software for several factors that influence the post-construction settlement of the CFG pile composite foundation in Wuhan-Guangzhou high-speed railway. On this basis, the influence degree and variation of each factor on the settlement was discussed to determine the main control factors of the settlement. The result shows that an increase in the elastic modulus or pile diameter will result in an increase in the stress ratio of pile to soil, and increasing the cushion thickness will decrease the stress ratio of pile to soil. When a combination of reinforced concrete pipe piles and CFG piles is used, the maximum settlement on the pile top is 2.01 mm, and uneven settlement is decreased by 46.5% compared with that using reinforced concrete pipe piles only
CFG桩复合地基承载性状的实验研究  [PDF]
潘纪顺,刘志伟
地质与勘探 , 2001,
Abstract: 通过CFG桩复合地基载荷试验和桩土应力比试验的研究,探讨了CFG桩复合地基承载特性。
PDA: Pooled DNA analyzer
Hsin-Chou Yang, Chia-Ching Pan, Chin-Yu Lin, Cathy SJ Fann
BMC Bioinformatics , 2006, DOI: 10.1186/1471-2105-7-233
Abstract: We develop the software, PDA, for the analysis of pooled-DNA data. PDA is originally implemented with the MATLAB? language, but it can also be executed on a Windows system without installing the MATLAB?. PDA provides estimates of the coefficient of preferential amplification and allele frequency. PDA considers an extended single-point association test, which can compare allele frequencies between two DNA pools constructed under different experimental conditions. Moreover, PDA also provides novel chromosome-wide multipoint association tests based on p-value combinations and a sliding-window concept. This new multipoint testing procedure overcomes a computational bottleneck of conventional haplotype-oriented multipoint methods in DNA pooling analyses and can handle data sets having a large pool size and/or large numbers of polymorphic markers. All of the PDA functions are illustrated in the four bona fide examples.PDA is simple to operate and does not require that users have a strong statistical background. The software is available at http://www.ibms.sinica.edu.tw/%7Ecsjfann/first%20flow/pda.htm webcite.The millions of single nucleotide polymorphisms (SNPs) now available are ideal for association analyses that identify important genetic variants in populations as well as genes predisposed to diseases involving complex traits [1,2]. Although the cost of individual genotyping has been reduced drastically over the years, the use of DNA pooling has reduced the cost even further, especially for large-scale studies. The first DNA pooling study was performed to identify the association between HLA class II loci and disease genes predisposing type 1 diabetes [3]. DNA pooling was later used to estimate the allele frequency of short tandem repeats and SNPs, map disease susceptibility genes [4,5], and identify polymorphisms [6-8]. A comprehensive review of the history of DNA pooling, the methods and algorithms involved, and the application thereof can refer to [9] and [10].DNA
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