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Settlement prevision of piles under vertical load 桩在竖向荷载作用下的沉降预测
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-10-01 DOI: 10.1680/GENG.2003.156.4.183
F. Castelli, E. Motta
This paper presents a simplified non-linear method to predict the behaviour of a single pile and/or a pile group under vertical loads. The evaluation of the non-linear settlement is based on an incremental procedure taking into account the decrease of the stiffness parameters with increase of the applied load. The solution, derived first for a single pile, was extended to the case of a pile group, introducing an equivalent pier interacting with the surrounding soil by means of hyperbolic load transfer functions. To take into account group action in the soil–pile interaction, the stiffness of the equivalent pier has been modified and linked to that of the single pile, and a simple expression is also proposed. The numerical results obtained by the proposed method were compared with measurements derived from fullscale load tests on single piles and pile groups, and it has been shown that this procedure can be used successfully for prediction of non-linear pile group settlement. As the method can be easily co...
本文提出了一种简化的非线性方法来预测单桩和/或群桩在竖向荷载作用下的行为。非线性沉降的评估是基于考虑刚度参数随外加荷载的增加而减小的增量过程。首先推导了单桩的解,然后将其推广到群桩的情况,通过双曲荷载传递函数引入等效墩与周围土体的相互作用。为了考虑桩土相互作用中的群作用,对等效墩的刚度进行了修正,并与单桩的刚度联系起来,提出了一种简单的表达式。将该方法的数值计算结果与单桩和群桩全尺寸荷载试验结果进行了比较,结果表明,该方法可以成功地用于非线性群桩沉降的预测。由于该方法可以很容易地…
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引用次数: 21
EMBANKMENT CUTTINGS: CONDITION APPRAISAL AND REMEDIAL TREATMENT 路堤岩屑:状况评估及补救处理
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-10-01 DOI: 10.1680/GENG.156.4.171.37531
J. Perry, M. Pedley, K. Brady, M. Reid
CIRIA Report C550 Infrastructure Embankments: Condition Appraisal and Remedial Treatment was published in 2001 and has proved to be one of CIRIA's most popular documents. Such was the demand for it, CIRIA commissioned the same team to produce a similar report on cuttings to the same format and targeted at the same audience. The cuttings report (CIRIA Report C591) is to be published in the winter of 2003, and an updated version of the embankment report (CIRIA Report C592) is also to be published at the same time, launching both geotechnical asset documents as a companion pair. This briefing note describes the background to the research projects and details their purpose, intended readership and the main aspects of managing geotechnical assets. The reports are intended to present best practice and to raise awareness of these important structures to the operation of an efficient transport network. (A)
CIRIA报告C550基础设施堤防:条件评估和补救处理于2001年出版,已被证明是CIRIA最受欢迎的文件之一。这是对它的需求,CIRIA委托同一小组以相同的格式和针对相同的受众制作了一份类似的剪辑报告。岩屑报告(CIRIA报告C591)将于2003年冬季出版,而堤防报告的更新版本(CIRIA报告C592)也将同时出版,这两份岩土资产文件将作为一对伙伴发布。这份简报描述了研究项目的背景,并详细说明了研究项目的目的、目标读者和岩土工程资产管理的主要方面。这些报告旨在介绍最佳做法,并提高对这些重要结构的认识,以有效地运作运输网络。(一)
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引用次数: 6
Sampling disturbance effects in soft laminated clays 软层状黏土取样扰动效应
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-10-01 DOI: 10.1680/GENG.2003.156.4.213
M. Long
Sample disturbance effects in the laminated facies at the Bothkennar soft clay research site are examined by comparing the results of laboratory tests on specimens obtained from three fixed piston tube samplers. A significant feature of the results is that the sampling process associated with the conventional piston tube used in the UK and Ireland appears to increase the post-yield stiffness and the CAUC triaxial undrained strength, reduce the preconsolidation stress and the pore pressure coefficient at failure, and induce a strong tendency for dilatant behaviour post-peak when compared with tests on specimens from a sampler with a modified (sharper) cutting edge angle. It is reasoned that these findings are caused by material destructuration during the sampling process with the conventional tubes. Increased densification of these specimens caused both by sampling and during anisotropic consolidation may also contribute to these effects. The results are supported by reference to recent analytical work and...
通过比较从三个固定活塞管取样器获得的样品的实验室试验结果,研究了Bothkennar软粘土研究场地层状相中的样品扰动效应。结果的一个重要特征是,与英国和爱尔兰使用的传统活塞管相关的采样过程似乎增加了屈服后刚度和CAUC三轴不排水强度,降低了破坏时的预固结应力和孔隙压力系数,并且与具有修改(更锋利)切削角的采样器的样品测试相比,诱发了峰后膨胀行为的强烈趋势。分析认为,这些现象是由于常规管取样过程中材料的破坏造成的。由于取样和各向异性固结过程中引起的这些试样的密度增加也可能有助于这些影响。参考最近的分析工作和…
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引用次数: 15
What is the matter with geotechnical engineering 岩土工程是怎么回事
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-07-01 DOI: 10.1680/GENG.156.3.159.37301
J. Atkinson
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引用次数: 9
Groundwater and ground movement around deep excavation 深基坑周围地下水和地面运动
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-07-01 DOI: 10.1680/GENG.2003.156.3.147
A. Pickles, S. W. Lee, B. A. W. Norcliffe
The Tsuen Wan West Station of Kowloon Canton Railway Corporation was constructed on both previously and recently reclaimed land. The project comprised approximately 600 m of cut-and-cover approach tunnels and a 400 m long station structure constructed in a 20 m deep excavation. Extensive instrumentation monitoring was carried out to monitor groundwater levels, ground movements and displacement of adjacent structures during the course of construction. This paper presents background information on the construction site and the monitoring results. It was found that the groundwater regime on the seaward side was strongly influenced by tidal movements throughout the monitoring period, whereas the landward groundwater regime showed a diminished tidal influence soon after construction of the diaphragm wall. Rock grouting carried out beneath the diaphragm wall was effective in mitigating drawdown of piezometric level outside the wall. The magnitude of the drawdown was found to be a function of diaphragm wall dept...
九广铁路公司荃湾西站是在以前和最近填海的土地上建造的。该工程包括约600米的切入覆盖引道和一个400米长的车站结构,在一个20米深的挖掘中建造。在施工过程中,进行了广泛的仪器监测,以监测地下水水位、地面运动和邻近建筑物的位移。本文介绍了施工现场的背景资料和监测结果。结果表明,在整个监测期内,向海侧的地下水受潮汐运动的影响较大,而向陆侧的地下水在连续墙建成后不久潮汐运动的影响减弱。连续墙下进行岩石注浆,可有效缓解墙外压力水平的下降。压降的大小是连续墙深度的函数。
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引用次数: 10
Chalk anchorages: exhumation load transfer mechanism and design guidelines 白垩锚固:挖掘载荷传递机制和设计指南
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-07-01 DOI: 10.1680/GENG.2003.156.3.125
T. Barley, D. Mothersille, R. Weerasinghe
An anchorage test programme carried out on the site of a deep basement construction in Norwich, UK, allowed the determination of anchorage capacities and creep characteristic data, and the exhumati...
在英国诺里奇的一个深地下室施工现场进行了锚固试验,确定了锚固能力和蠕变特性数据,并对其进行了挖掘。
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引用次数: 4
Lime slurry stabilisation of an expansive soil 膨胀土的石灰浆稳定
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-07-01 DOI: 10.1680/GENG.2003.156.3.139
Sudhakar M. Rao, T. Thyagaraj
Lime slurry and lime pile techniques are viable choices for in-situ stabilisation of expansive soil deposits. This paper reports the results of a laboratory study on in-situ chemical stabilisation of an expansive soil that permeated lime slurry through an artificially desiccated expansive soil specimen. The soil was desiccated in the laboratory to induce shrinkage cracks in the compacted expansive soil. The shrinkage cracks greatly assisted migration of lime slurry in the expansive soil mass. The efficiency of lime slurry in chemically stabilising the desiccated expansive soil was investigated by comparing the physico-chemical properties and engineering properties of the treated soil with those of the natural soil specimen at two radial distances. Experimental results indicated that migration of lime slurry through the desiccated soil promoted strong lime modification and pozzolanic reactions in the soil mass. The strong soil–lime reactions rendered the soil less plastic, reduced the swell magnitude, and ...
石灰浆和石灰桩技术是膨胀土堆积物原位稳定的可行选择。本文报道了通过人工干燥膨胀土试样对石灰浆渗透膨胀土进行原位化学稳定的实验室研究结果。在室内对膨胀土进行干燥处理,使其在压实后产生收缩裂缝。收缩裂缝极大地促进了石灰浆在膨胀土体中的运移。通过在两个径向距离上比较石灰浆处理后的土与天然土的理化性质和工程性质,研究石灰浆对干燥膨胀土的化学稳定效果。试验结果表明,石灰浆在干燥土中的迁移促进了土体中强烈的石灰改性和火山灰反应。强烈的土-石灰反应使土壤的塑性减小,膨胀幅度减小,且土-石灰反应使土体的塑性减小。
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引用次数: 35
Tunnelling through varying soil conditions in north-west Greece 在希腊西北部不同的土壤条件下挖掘隧道
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-04-01 DOI: 10.1680/GENG.2003.156.2.97
V. Georgiannou
Tunnel S2 of the Egnatia Motorway is excavated through heavily fractured limestone and sheared sediments. Originally a fold and thrust belt was formed in the Alpine orogenic phase. Post-orogenic tectonics resulted in heavy fragmentation. The underlying material consists of clays and clayey sandy gravels. The basement of the clastic formation consists of evaporites. This variety of geological conditions resulted in considerable variability of tunnelling conditions and the need for extensive primary support measures. Owing to the mixed and rapidly changing geological conditions the type and intensity of primary support measures were selected according to geomechanical conditions at the crown. Slope stability problems were encountered during the excavation of the entrance portal, and because of the associated risk an additional study has been carried out to determine appropriate soil parameters for the excavation works through such a medium. Oedometer tests and direct shear tests were carried out to investig...
Egnatia高速公路的隧道S2是在严重断裂的石灰岩和剪切沉积物中开挖的。最初形成于阿尔卑斯造山期的褶皱冲断带。造山后构造导致了严重的破碎。下面的物质由粘土和粘土砂砾石组成。碎屑地层的基底由蒸发岩组成。这种地质条件的多样性导致了隧道条件的相当大的变化,需要广泛的初级支护措施。由于矿区地质条件复杂多变,主要支护措施的类型和强度根据矿区的地质力学条件进行选择。在挖掘入口时遇到了斜坡稳定性问题,由于相关的风险,我们进行了额外的研究,以确定通过这种介质进行挖掘工程的适当土壤参数。进行了直剪试验和直剪试验。
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引用次数: 8
Determination of parameters for a hyperbolic model of soils 土壤双曲模型参数的确定
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-04-01 DOI: 10.1680/GENG.2003.156.2.105
N. Al-Shayea, S. Abduljauwad, R. Bashir, H. N. Al-Ghamedy, I. Asi
Analysis of some geotechnical problems using finite-element methods requires the implementation of a nonlinear model for soil materials, to better represent their actual behaviour. Constitutive modelling of soil mass behaviour and material interfaces is an essential component of the solution of boundary and initial value problems. The hyperbolic model is one of the most frequently used non-linear models for predicting the behaviour of soils in boundary value problems. The parameters of this model for specific soils need to be determined experimentally. This paper presents the results of extensive laboratory testing carried out on three soils from the Eastern Province of Saudi Arabia: sand, marl and sabkha. The tests used to obtain these results were the triaxial compression test, the hydrostatic (isotropic compression) test, and the direct shear test. Additionally, other tests were used to obtain various physical properties needed for the complete characterisation of these soils. Parameters of the hyperbo...
用有限元方法分析一些岩土工程问题,需要对土材料实施非线性模型,以更好地代表它们的实际行为。土体特性和材料界面的本构建模是解决边界和初值问题的重要组成部分。双曲模型是边值问题中最常用的预测土的非线性模型之一。对于特定土壤,该模型的参数需要通过实验确定。本文介绍了对来自沙特阿拉伯东部省份的三种土壤进行的广泛实验室测试的结果:砂、泥沼和sabkha。用于获得这些结果的试验是三轴压缩试验、静压(各向同性压缩)试验和直剪试验。此外,还进行了其他试验,以获得完整表征这些土壤所需的各种物理特性。hyperbo参数…
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引用次数: 28
EXPERIMENTAL STUDY OF VIBRATIONS IN UNDERGROUND STRUCTURES 地下结构振动的实验研究
IF 0.3 Q4 Earth and Planetary Sciences Pub Date : 2003-04-01 DOI: 10.1680/GENG.2003.156.2.75
N. Thusyanthan, S. Madabhushi
Vibrations produced on the ground surface by engineering construction processes can damage underground structures. At present there is little knowledge of the level of surface vibrations that could cause such damage. The relevant British Standards, BS 5228 and BS 7385, have little relevance to underground structures. This paper presents experimental investigations on small model tunnels that were instrumented with miniature accelerometers. Impulsive and vibratory loadings were produced on the soil surface by a drop hammer mechanism and an electric eccentricmass motor respectively to simulate dynamic loading from construction activity. It was found that tunnels with different lining materials absorb different amounts of vibration energy. Power spectrum analysis of the acceleration signals showed that the vibrations are transferred into a brass model tunnel at lower frequencies than for a plastic model tunnel. A relationship has been proposed for the ratio of energy transferred and the ratio of impedance mi...
工程施工过程中在地表产生的振动会破坏地下结构。目前,人们对可能造成这种损害的地表振动程度知之甚少。相关的英国标准BS 5228和BS 7385与地下结构的相关性很小。本文介绍了安装微型加速度计的小型模型隧道的实验研究。采用落锤机构和偏心质量电机分别对土体表面施加脉冲和振动载荷,模拟施工活动产生的动载荷。研究发现,不同衬砌材料的隧道吸收的振动能量不同。加速度信号的功率谱分析表明,振动以较低的频率传递到黄铜模型隧道,而不是塑料模型隧道。提出了传递能量比与阻抗阻抗比的关系式。
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引用次数: 10
期刊
Geotechnical Engineering
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