共查询到20条相似文献，搜索用时 390 毫秒
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通过对汕霜大型建筑采用粉喷桩处理地基的工程试验研究,论证了在巨厚层软土地区采用长短桩间排布设方式是解决下卧层强度问题的有效途径之怀,为深欠土地区的地基处理及基础选型提供了宝贵的实践经验。 相似文献
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引碧入连工程,大沙河倒虹吸地质条件复杂,岩性多为淤泥质土和中细砂,前者地基承载力不及８０ｋＰａ,后者有严重的砂土液化问题,为此采用了复合地基处理,提高了地基强度又防止了砂土液化,在施工中应用了静载荷及动力法进行了检测,测定了复合地基的有效性。 相似文献
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地基液化是高地震烈度区影响地基稳定性的重要因素之一，是引起构筑物破坏的主要形式。通过工程实例说明采用强夯法处理可液化地基，可有效消除液化，提高地基承载力。 相似文献
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强夯加插板加固软基的试验研究 总被引：1，自引：1，他引：0
采用强夯法加固地基上部吹,回填土,打设塑料排水板排水固结地基下部软土的联合施工工艺,对我国北方某地的软土地基处理进行了试验研究,通过分析试验小区的监测资料得知,该地基处理方法在技术上可靠,工艺上合理。 相似文献
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通辽电厂地基处理方案决策 总被引：3，自引：0，他引：3
通辽电厂地基条件不能满足主要建筑物采用天然地基的要求,需要进行地基处理。采用AHP建立了地基处理方案的层次结构模型,通过地基处理原体试验结果对指标和因素进行量化、取值,取得了满意的评价结果。 相似文献
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During the excavations for the foundations of a three storey building on the limestone tuffs of Condeixa, Central Portugal,
a large dissolution fissure and smaller dissolution voids were found. Since the area has never been the subject of engineering
geology investigation, it was decided to evaluate the risk associated with the construction of the building. These limestone
tuffs were formed in a continental environment by the precipitation of calcite carried by the water coming from the large
limestone body in the east. The precipitated calcite mixed with the terrigenous materials and around trunks and leaves of
plants, originating a very heterogeneous and porous ground, which is characteristic of limestone tuffs. The study started
with a detailed geological survey followed by a large number of destructive drillings, located essentially under the pad foundations.
The results revealed several karstic cavities with serious problems for the building foundations and the structure, and many
smaller dissolution cavities, often filled with clayey soils. The ground treatment solutions used included, dental cleaning,
filling with concrete or granular material the dissolution structures accessible at the level of the foundation, reinforcement
of the footing and the structure of the building and adding a continuous foundation beam to hold the foundations together.
The cost of the engineering geology study, site investigation, ground treatment, and the reinforcement of the foundation and
building, increased the total construction cost from 2%, at the design stage, to 4.8%. 相似文献
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The construction of additional facilities at the Florida Power Corporation's Crystal River Energy Complex required an extensive stabilization program to construct foundations for approximately one half mile of cooling towers. This paper presents an overview of the techniques and methods used in the construction of additional facilities at the Crystal River Generating Station. Excavations for intake and discharge structures were to be more than 20 ft below the water table. Cooling tower foundations were constructed on extensively solutioned Florida limerock located on the central Gulf Coast of Florida. Hybrid ground modification techniques were used to stabilize soft or loose soils and solution features in the underlying limerock, allowing mat and spread footing foundations to be used for most of the facility. The ground modification techniques were used to detect, collapse, densify, and fill solution features below the structure foundations. The bearing capacity after ground modification was verified by field load tests. Subsurface investigations indicated that sheet pile excavations with grouted seals were the optimal technique for cofferdam excavations in the limerock formation. Existing collapsed caverns were encountered during construction of the cofferdam for the intake structure and the adjacent discharge structure, requiring a fast-track design change, considerable field coordination, and daily modifications to accommodate the varied conditions encountered. Tied-back soldier pile cofferdam construction was combined with grouting, underwater excavation, and a massive, unreinforced, concrete tremie slab with grouted anchors, and installed off a barge to provide a dewatered excavation. This project involved the use of hybrid soil-rock anchors to anchor one of the largest continuous placement tremie seals installed in Florida. Other excavations used sheeting and grouting of the underlying limerock formation to provide a dewatered excavation. Ground modification techniques were used to treat a filled cavern discovered in the corner of one discharge structure. The entire construction of this facility was confined to a narrow work area by existing wetlands and the generating station discharge canal. Strict environmental restrictions required by the regulatory agencies to prevent impacts to the surrounding area were imposed on this project. 相似文献
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山区机场高填方地基工后沉降变形简化算法 总被引：3，自引：0，他引：3
我国西部山区机场建设的迅猛发展导致高填方地基日益增多。填方体量大、高度高,且存在软弱原地基是此类填方地基的主要特点,这也增加了预测其工后沉降变形的难度。针对山区机场高填方地基的构成特点,将其工后沉降变形的计算分为软弱原地基和上部粗粒填料填方体两部分进行考虑。在分析比较已有简化算法的基础上,对软弱原地基的沉降变形提出了可以考虑施工加载过程的简化计算方法,并应用此法对实际工程进行了计算,所得结果与现场实测值吻合相对较好;通过对室内试验数据进行分析,发现双曲线模型亦能较好的预测粗粒料的蠕变变形,进而在此基础上提出了计算粗粒料填方体长期蠕变变形的简化算法。 相似文献
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以长江经济带上游地区泸州市规划中心城区为例,建立了包括多因素综合评价模型和多层次评价指标体系的工程建设适宜性评价方法,采用模糊赋权法和层次分析法相结合的组合赋权法计算评价指标的权重,利用GIS空间分析技术对泸州市规划中心城区工程建设适宜性进行了评价,并对评价方法的可靠性进行了分析。结果表明：泸州市规划中心城区工程建设适宜性整体较好,以适宜、较适宜为主,其中适宜区、较适宜区分别占研究区总面积的36.16%、28.81%,此外适宜性差区、不适宜区各占20.96%、8.07%;泸州市城市规划建设、重大工程建设选址应在适宜区和较适宜区范围内,尽量避免适宜性差和不适宜地区;在适宜性差和不适宜地区进行工程建设应注意不同区段现有和可能诱发的地质灾害、地基不均匀沉降、软土、坍岸等问题的防治。建立的评价方法在丘陵城市工程建设适宜性评价上适用性较好。 相似文献
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多年冻土区输电线路塔基基础附近活动层厚度和地下冰变化与基础稳定性密切相关,塔基施工的热扰动和混凝土基础的热效应使得基础周围冻土易发生退化,不利于基础的稳定。高密度电法是冻土工程环境研究中常用的地球物理方法,其探测结果的可靠性和分辨能力受数据采集方式、目标体地电结构影响。为减小对输电线路塔基附近冻土特征识别的不确定性,通过建立基础周围多年冻土地电模型的正反演模拟,发现活动层处于融化状态时各种装置方式数据采集均能较好地反映活动层厚度的起伏,但由于冻融锋面附近显著的电阻率差异,难以识别多年冻土层内的地下冰空间分布特征。而活动层处于冻结状态时进行探测能显著提高对多年冻土层内的地下冰空间分布特征识别精度,其中偶极-偶极装置可较好地识别高、低含冰量区域的发育位置和形态特征。在青藏直流输电线路塔基基础附近冻土探测中证实了方法的有效性,探测结果揭示了施工过程和基础热效应导致的塔基基础附近的地下冰退化。以上研究表明,通过正反演模拟,根据具体探测目标选择合适的探测时机和数据采集方式,能显著提高高密度电法探测结果的有效性和精度。 相似文献
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为研究大厚度自重湿陷性黄土地区地基处理深度与剩余湿陷量的合理控制关键技术难题,对采用不同处理深度的挤密地基进行了大面积深层浸水载荷试验。试验结果表明：对采用挤密地基处理在6～12 m深度以下进行深层浸水后均发生不同程度的地基湿陷下沉,而地基处理在15 m深度时（剩余湿陷量远大于200 mm）地基整体实际下沉量相对较小,说明现行的《湿陷性黄土地区建筑规范》对乙、丙类建筑地基关于最小处理深度的规定过于严格,不符合现有的经济技术水平,建议在采取一定措施的情况下将12~15 m作为乙、丙类建筑在大厚度自重湿陷性黄土地区地基处理的合理深度。并针对现行规范中对乙、丙类建筑剩余湿陷量控制的不合理之处,提出了“剩余湿陷量折减系数” 这个概念,并提出了该折减系数的建议值,可为同类工程建设和规范修订提供一定的参考。 相似文献
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邻近不同基础建筑物地铁盾构施工相互内力影响研究与分析 总被引：1，自引：0，他引：1
在建筑物密集的城区,盾构施工通常会使周围一定范围内的既有建筑物受到影响。在考虑建筑物基础形式不同情况下,采用有限元方法对邻近不同位置建筑物工况下的盾构隧道施工进行了模拟和分析。研究表明：建筑物基础形式不同,对隧道衬砌的受力状况的影响也不同,在邻近建筑物的盾构隧道施工时衬砌要承受更大的内力值。对于隧道邻近浅基础建筑物的工况,隧道开挖对建筑物的影响比较大;但对于桩基础建筑物,邻近基础一侧隧道开挖引起的建筑物内力变化相对较小 相似文献