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本钢郑家屯潜水含水层弥散试验研究 总被引：3，自引：0，他引：3
在本钢郑家屯潜水含水层中进行了弥散试验，以Ｃｌ＾－为示踪剂，瞬时投放，根据流场条件，建立了二维水质运移模型。利用标准曲线法进行处理，得到了各监测井处的弥散度，对该试验结果进行分析，得到了在试验范围内，多孔介质中水动力弥散度的变化。 相似文献
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介绍了预应力轨枕生产工艺，分析了预应力轨枕在工作时的受力状况，对预应力轨枕进行了疲劳试验，对试验结果进行了分析，基于试验研究的结论，提出了在预应力轨枕中掺入体积率为1％的钢纤维作为改进的设计方案，并对改进的轨枕进行了试验研究，试验研究证明因钢纤维自身阻裂效应及其与预应力阻裂能力的复合，大幅度地减少了在疲劳荷载作用下轨枕的加载最大裂宽和裂高，剩余最大裂宽和裂高，由此可见，预应力钢纤维高强度混凝土轨枕比原轨枕的性能要高。 相似文献
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通过某码头工程典型试验区进行的强夯试验，研究了在单点夯试验过程中夯沉量与夯击次数的关系、地基土水平位移和深度的关系、夯击次数与孔隙水压力的关系及孔隙水压力增长与消散和时间的关系；在试验块强夯后，进行了静载试验、静力触探试验和钻孔取土室内土工试验。通过对强夯前后进行对比，得到了强夯法加固吹填砂地基的效果，提出了合理的强夯施工参数和控制工艺，并得出了一些有益的结论。 相似文献
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现代工业迅猛发展的同时，也随之产生大量的工业废渣。利用工业废渣修筑道路基层，既可以达到道路基层的强度标准，也可以解决大量废渣的处理问题，具有十分重要的现实意义。论文对锰铁废渣的化学成份进行了分析，对风积土的物理力学性质进行了试验研究，获得了大量的科学数据。同时利用石灰、锰铁废渣、碎石和风积砂土作为路面基层稳定土的原材料，进行了配比试验和性能测试。在试验过程中，运用均匀设计方法安排试验，测量稳定土的各项指标。依据试验结果，采用SPSS软件进行了回归分析，得到了稳定土无侧限抗压强度的回归方程。试验结果表明，利用锰铁废渣作为道路基层的填料是可行的，既可以节约原材料的能量消耗，又可以减少环境污染，具有广泛的应用前景和显著的社会效益、环境效益与经济效益。 相似文献
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本文叙述了对８根钻孔灌注桩的一系列检测和试验，这是迄今为止在福州进行的较为系统完整的桩基试验，试验结果反映了福州软土中嵌岩桩在静、动荷载下的性能，以及施工因素对桩承载性能的影响。 相似文献
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软土固结系数刍议 总被引：1，自引：1，他引：0
在土的固结分析中,要正确估算土体中超静孔隙水压力的消散与沉降过程,重要的是确定可靠的固结系数Cv值.通过在天仙一级公路软弱地基路基工程沿线选择的二个试验场地上开展原位试验及室内试验,并结合珠江口某海区软土的固结试验数据,研究软土固结系数的规律,探讨其确定方法.研究表明：（1）由原位孔隙水压力消散试验得到的固结系数Cv值比室内高压固结试验时间平方根法所得到的相应值大一个数量级;（2）由室内高压固结试验时间平方根法所得到的固结系数Cv值大于时间对数法、反弯点法、三点法及司各脱法所得到的Cv值.（3）由于反弯点法、三点法及司各脱法确定固结系数Cv值有其各自的优点,在实际工程中均值得去尝试和推广. 相似文献
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Several experimental methods have been proposed for consolidation test such as: constant loading rate, constant gradient and
constant rate of strain (CRS). Unfortunately, there are no unique criteria for performing the CRS consolidation test. Also,
there are considerable differences among the standards proposed for the test. In the present paper, authors have tried to
find the reasons for differences among standards, by studying the basic assumptions made on the characteristics of the pore
water flow during consolidation process. In the course of study, CRS consolidation tests were carried out under different
strain rates on remolded samples. The results of the tests have indicated that the Darcy’s law is not valid throughout the
CRS test and therefore, any consolidation equation based on Darcy’s law would not provide accurate results. The results of
the current experiments also showed that with regard to the applied strain rates, there are three different flow regimes governing
the process named as: pre-linear (non-Darcy flow), linear (Darcy flow) and post-linear (non-Darcy flow). Experimental results
also showed that distinction between boundaries of linear and nonlinear flow is possible from the excess pore pressure developed
during the tests. 相似文献
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An experimental investigation was carried out on the reconstituted Tunis soft soil (TSS) that was extracted from the centre of Tunis City at 35-m depth. Three series of consolidation tests were performed on TSS specimens. The first series included consolidation tests by preload. In the second series, vacuum consolidation tests were performed. The third series comprised a vacuum consolidation test combined with the preload. Excess pore water pressure and settlement were measured during the consolidation tests. Experimental results showed that for the same magnitude of preload and the vacuum pressure of 4, 8, 16 and 30 kPa, the settlement caused by the vacuum pressure is lower than that generated by the preload, while the settlements generated by preloads of 60 and 100 kPa are slightly lower than those caused by vacuum pressure of 60 and 100 kPa. A rapid dissipation of recorded excess pore water pressure around the geodrain was observed compared to that measured close to the cell border. 相似文献
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本文利用无侧向变形的单向压缩试验仪,对原状和重塑上海软土进行了压缩试验和流变试验,研究了不同压力和超固结比对次固结系数的影响以及压缩特性和次固结变形特性的关系。试验结果表明,原状上海软土的次固结系数随着压力而变化,而重塑上海软土的次固结系数随压力变化不大。上述研究得到的结论及相关参数可为工程实践、上海软土流变模型的建立提供参考数据。 相似文献
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电渗固结是促进低渗透性软土排水固结的有效方法。为了揭示不同电势梯度影响高岭土电渗固结的基本规律,在自制电渗试验装置上对高岭土进行电渗试验。试验过程中测量电流、排水量、沉降量以及有效电压随时间的变化,并进行单位排水能耗分析。基于电渗固结多场耦合控制方程,实现土体电渗固结全耦合分析的有限元数值方法,计算结果与解析解吻合良好,验证了程序的有效性。为预测不同电势梯度下土体沉降量随时间的变化关系,分别对0.5,1.0,1.5 V/cm 3种电势梯度电渗固结试验进行数值模拟分析,获得模型表面沉降量分布、阳极超静孔隙水压力时空发展规律、阳极位置固结度等曲线,计算结果和试验结果吻合良好,可为实际电渗试验提供理论指导。 相似文献
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针对传统仪器无法考虑岩土工程中温度和荷载等因素综合作用的缺陷,研制了一套多功能土-水特征曲线试验仪。以粉土为研究对象,开展了不同固结应力作用下粉土的土-水特征曲线试验,并测量其增减湿过程中土体的体积胀缩量,以便修正体积变化对其体积含水率的计算误差。结果表明,粉土在减湿过程中,土体的体积发生明显的收缩。其收缩量与固结应力水平有关,固结应力越小,则减湿引起的体缩量越大。但土体在增湿过程中的体积则基本保持不变。固结应力对粉土 土-水特征曲线的进气值、增减湿速率影响较大,固结压力越大,其进气值越大、减湿速率也越大。最后,为揭示固结应力对土的持水性能的影响机制,开展了不同固结应力作用下土体的细观试验。结果表明,固结应力主要改变了土体团粒间的大孔隙,而对黏土颗粒之间的孔隙影响较小。土体的持水性能与土体的孔隙大小和分布模式密切相关,大孔隙主要影响土体的进气值,而其孔隙分布模式则控制其增减湿湿速率。 相似文献
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A. Arulrajah M. W. Bo H. Nikraz A. S. Balasubramaniam 《Geotechnical and Geological Engineering》2007,25(6):647-656
In situ dissipation tests provide a means of evaluating the in situ coefficient of consolidation due to horizontal flow and
hydraulic conductivity in horizontal direction in marine clays formation. Dissipation tests by means of piezocone were utilised
in the characterisation of the coefficient of consolidation due to horizontal flow and the hydraulic conductivity in horizontal
direction of Singapore marine clay at Changi. Piezocone dissipation tests were carried out prior to reclamation as well as
after ground improvement with vertical drains to compare the changes in the coefficient of consolidation due to horizontal
flow and hydraulic conductivity in horizontal direction prior to and after ground improvement. The quasi-static piezometric
pressures from the dissipation tests were compared with piezometric pressures from piezometers to determine their possibility
of future use as an alternative to piezometers. Post-improvement CPTU dissipation tests were carried out in the treated “Vertical
Drain Area” as well as in an adjacent untreated “Control Area” for comparison purposes. This study provides support for the
use of piezocone dissipation testing methods for the determination of the coefficient of consolidation due to horizontal flow
and hydraulic conductivity in horizontal direction of marine clays in the region as well as an alternative to piezometer instrumentation
for monitoring of piezometric pressure during consolidation. 相似文献
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针对某深厚湿陷性黄土地基,分别采取了不同夯击能(8000kNm、6500kNm和3000kNm),不同的夯点间距(1.6D、2D和2.5D)及不同的夯锤底面积(5m2, 7m2)等5种方案组合进行了强夯处理对比试验。处理前后分别进行了标准贯入、静力触探、载荷试验及渗透试验等一系列原位及室内试验,结果表明:各强夯方案对地基土干重度、承载力、压缩性、湿陷性及渗透性等性质均有较大影响。各方案有效加固深度,随着施工工艺和参数的不同有所差别。对强夯震动波水平加速度进行了测试,对其衰变规律做出来了初步判定。试验结论可以为类似工程的设计施工提供借鉴。 相似文献