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山西潞城地区, 按“78规范”应属于非自重湿陷黄土, 勘察过程中发现存在自重湿陷性质, 这就引起了我们的重视。我们除了进行常规的勘察试验之外, 还进行了专门性的勘察试验, 内容包括:野外现场试坑浸水试验, 分层载荷试验, 静探、标贯、旁压等原位测试和钻井、探孔取样室内试验以及土的微结构分析。 相似文献
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浅析岩土工程勘察中的一些常见问题 总被引:1,自引:0,他引:1
本文仅从岩土工程勘察的踏勘、野外勘探、室内土工试验及岩土工程分析评价方面分析了岩土工程勘察中存在的一些常见问题,旨在避免这些问题,从而为设计提出更好的勘察成果。 相似文献
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武汉地铁二号线一期工程岩土工程勘察特点分析 总被引:4,自引:1,他引:4
通过对武汉市轨道交通二号线一期工程沿线区域地质构造、工程地质和水文地质特点的分析,说明了在不同地貌单元和不同地质条件下针对地铁施工工法、进行岩土工程勘察的基本内容和方法,指出了地铁勘察在场地条件、勘察要求、试验内容等方面不同于一般的工业与民用建筑岩土工程勘察工作的特点,并据此合理安排勘察实施方案。 相似文献
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林崇宇 《华北地质矿产杂志》1994,9(3):322-327
上海市城市地质勘察工作综述林崇宇(中国船舶工业总公司勘察研究院)1工程地质与岩土工程近十几年来上海进行了大量工程地质勘察。进入90年代,勘察部门由单一工程勘察,逐渐转为岩土工程勘察。加之测试技术、室内土工试验和钻探技术的不断改进和发展,各勘察单位又自... 相似文献
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地基承载力的试验研究 总被引:7,自引:3,他引:7
进行地基承载力的试验研究, 对于充分利用和挖掘地基潜力、合理选择地基持力层、提高勘察工作质量、促进岩土工程勘察技术的发展具有重要的现实意义。本文结合唐山钢铁公司第二炼铁厂 2 5 6 0m3 高炉勘察实例, 系统介绍了地基承载力的试验研究过程, 并应用了-种有推广价值的试验技术室内模拟载荷试验。 相似文献
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通过分析南宁盆地第三系泥岩工程地质及水文地质条件,并结合南宁轨道交通工程建设特点,探讨了1号线穿越膨胀岩区的岩土工程勘察方法、试验项目及相关注意事项。提出了南宁轨道交通穿越膨胀岩区详细勘察中对钻孔间距及封孔要求、现场描述等内容;其中对室内试验建议补充岩石矿物的鉴定、吸水率和饱和吸水率试验、耐崩解试验、膨胀性试验;原位试验项目建议增加地应力试验、现场基床系数K_(30)试验、现场浸水载荷试验、水平膨胀力试验项目。并针对一些特殊勘察项目,如现场测定基床系数K_(30)、热物理指标及水平膨胀力等提出一些建议。 相似文献
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建筑工程勘察、设计和施工一体化模式,逐渐成为国内大型勘察设计企业新的核心竞争力,亦是国际国内经济一体化和市场经济发展的必然趋势。本文结合目前国内主要从事岩土工程的勘察、设计或施工企业对项目的运作情况,提出了岩土工程勘察、设计和施工一体化运作模式。通过对目前国内岩土工程勘察、设计和施工独立运作模式和一体化模式的对比研究和分析,结合典型的工程实例,总结和分析了采用一体化或近似一体化模式运作项目的优劣和经验。针对目前国内大型勘察设计企业实施岩土工程勘察、设计和施工一体化模式的困难进行了探讨并提出相关建议,供相关部门或同行参考。 相似文献
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在当前岩土工程施工装备、工艺日趋完善的情况下,正确掌握其发展动向,合理地配置装备和工艺;在承揽各类型岩土工程施工中,应注意发挥已拥有的建筑设计,基础施工、地面建筑、工程质量检测的高技术领域,组成综合服务体系,以获取最大的经济效益。 相似文献
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岩土参数的正态分布是岩土工程可靠分析的基本假定之一。目前,岩土工程参数的正态性检验以KS (Kolmogorov-Smirnov)检验为主,然而诸多研究表明,对于小样本数据,KS检验的正态性检验结果并不可靠。本文以废黄河泛滥沉积相粉土中的孔压静力触探(CPTU)锥尖阻力qt数据为研究对象,首先采用ANOVA (方差分析)检验,从CPTU测试资料中进行总体的样本筛选,然后应用SW (Shapiro-Wilk)检验、KS检验、LF (Lilliefors)检验和AD (Anderson-Darling)检验等4种正态性检验方法,在不同样本容量条件下,对测试数据进行正态性检验评价。当测试数据的样本容量充足时,分析结果表明:SW检验结果最为严格,KS检验结果最不保守,而LF检验和AD检验的严格性介于两者之间;对于常规岩土工程设计,采用KS检验结果即可满足稳定性分析要求,对于复杂岩土工程设计,采用SW检验对设计参数进行正态性检验,可降低设计的不确定性。 相似文献
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如何减少和解决岩土工程勘察中的问题 总被引:1,自引:0,他引:1
在城市化进程进一步加快的过程中,城市基础设施建设项目和高层建筑也随之不断兴建,传统的勘察手段以及传统的工程勘察方法已经显得力不从心,很难满足现代建筑设计的需求,因而许多工程勘察技术缺陷问题迫切的需要找到解决方法。本文通过勘测的实例来说明岩土工程勘测中的问题,以及解决的方法。 相似文献
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Geotechnical construction is responsible for the overall stability of superstructures, and if there are design errors, the structure will be exposed to potential problems. Geotechnical design starts with the correct interpretation of the target ground. Southeastern Iraq is mainly comprised of an alluvial plain with diverse geological features, and, therefore, geotechnical design requires a detailed interpretation and understanding of the area. This paper reports on laboratory and field tests and in-depth analyses conducted on these alluvial plains. The results reveal that the upper layer of this area is highly over-consolidated. This may have been caused by the removal of overburden pressure as a result of glaciation and desiccation. The highly over-consolidated soils caused considerable sample disturbance by swelling the bored sample; this provided less reliable results. However, the cone penetration test was regarded as the most appropriate field assessment method for deriving sensible geotechnical design parameters. Despite its limitations in clayey soils, the standard penetration test provided results that matched well with previous observations due to the high penetration resistance of the highly over-consolidated ground. Down-hole tests and plate load tests were considered less reliable methods due to their limited applicability in this area. This study considers geographical features, laboratory methods, and empirical correlations from in situ tests, and, therefore, provides a well-summarized guideline to evaluate special geotechnical characteristics of the alluvial plain in southeastern Iraq. 相似文献
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Kot F. Unrug 《Geotechnical and Geological Engineering》1984,2(2):141-155
Summary Criteria for shaft design are described and methods of design developed. Among aspects covered in detail are: selection of shaft locations; shaft collar design and determination of collar dimensions; shaft lining design and estimation of side pressures; shaft insets and sump design. Factors considered, apart from geotechnical criteria include constraints imposed by surface structures, mineral handling and water flows. 相似文献
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A 132 kVA electrical transmission line has been proposed to connect the towns of Eket and Ikot Abasi in the eastern Niger
delta in Nigeria. A geotechnical and hydrological study was performed to geotechnically characterize the route alignment and
to provide data for design of the foundations for the transmission towers. In this paper, we introduce the study location
and its geological, topographical and physiological characteristics, present the hydrological and geotechnical investigations
and their results, and make recomendations for the design of the transmission tower foundations. Hydrological inspection of
the power line alignment revealed that the route is traversed by numerous tributaries of the Qua-Iboe and Imo Rivers, the
two major rivers that control the drainage of the study area. In-situ geotechnical tests consisted of cone penetration tests
(CPTs), vane shear tests, test pit sampling (0–2.0 m depth) and lithologic boreholes (20 and 50 m deep). Laboratory tests
included grain size analysis, pH determination and Atterberg Limits. Based on the CPT log pattern, no of stratum, and refusal
depths, the soils along the transmission alignment were classified into twelve structural domains having common geotechnical
properties. Because of the elevated water levels, and the nature of the soils, deep pile foundations were recommended for
the towers. Software from the Louisiana Transportation Research Center, was employed to estimate skin friction, end bearing,
and ultimate bearing capacities for assumed 225 mm square shaped reinforced concrete pile in each of the different zones of
the alignment. 相似文献
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An important component in reliability-based design is the geotechnical property variability. Generic estimates are used often,
but calibration to a local geologic setting is preferable. In this case history, a methodology is shown that employs local
geotechnical data to estimate the total variability, using Ankara Clay for illustration. A literature review is used to estimate
the inherent variability, which is modeled as a random field with coefficient of variation (COV) and scale of fluctuation.
The resulting inherent variability COVs are much smaller than the generic ranges. Local correlations between various laboratory
and field tests and soil strength and compressibility parameters then are developed to quantify the transformation uncertainties.
The various sources of uncertainty are combined through a second-moment method to estimate the total geotechnical variability
as a function of the test type and correlation used. The results show: (1) the COVs for direct laboratory measurements are
significantly smaller than those obtained through correlations, and (2) depending on the geotechnical data available, the
local COVs can be very different from the generic guidelines. These could lead to unconservative designs. These issues are
illustrated by a simple design example. 相似文献