Cause Investigation of Abnormal Settlement Phenomenon in Pleistocene Clay Layers by Experimental Examination of Clay Structural and Mineralogical Composition Changes

通过粘土结构和矿物成分变化的实验检验研究更新世粘土层异常沉降现象的原因

基本信息

  • 批准号:
    14350258
  • 负责人:
  • 金额:
    $ 8.26万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2002
  • 资助国家:
    日本
  • 起止时间:
    2002 至 2003
  • 项目状态:
    已结题

项目摘要

In this research, the K_0-consolidation characteristics of Pleistocene clay were examined using the strain-path controlled triaxial apparatus. The advantages of this test are described when compared with the conventional tests. Shear modulus was measured using bender element system to observe the change of particle structures indirectly. In addition, the particle structures were observed directly using the scanning electron microscope. The following concluding remarks can be obtained from this work.1. The advantages of the strain-path controlled test were shown in the following : Strain and excess pore pressure in a specimen can control freely and can keep homogenous even in the large strain domain ; the drained mode and the K_0-consolidation mode of clays can be controlled exactly and their testing times can be shortened.2. The result of this strain-path controlled K_0-consolidation test showed the very characteristic consolidation behavior of Pleistocene clay ; the void ratio decreas … More ed rapidly just after the pre-consolidation stress. This behavior is not apparent in a reconstituted kaolin clay sample. The K_0 value decreased to the pre-consolidation stress, then increased rapidly after that, and became a steady value. It seems that such results were due to structural change occurring in the clay just after the pre-consolidation stress.3. The shear modulus G during the K_0-consolidation test gradually increased to 100 (MPa), then it almost kept constant after that. The void ratio of this changing point in G precisely agrees with the one changed rapidly just after the pre-consolidation stress. The main cause of this change G can be recognized to be structural changes of Pleistocene clay significantly just after the pre-consolidation stress.4. The microscopic structure of Pleistocene clay was observed using the scanning electron microscope (SEM). A large number of diatoms destroyed were observed in the sample taken after a test although intact diatoms were observed in the one before a test. It can be considered that one of the causes for the rapid reduction of the void ratio just after the pre-consolidation stress is the frame of diatoms destroyed. In this research, the change of link structures of clay particles was not observed, which was considered as another cause of the rapid reduction of void ratio near the pre-consolidation stress. Less
本研究利用应变路径控制三轴仪,探讨更新世黏土之K_0固结特性。与传统的测试相比,这种测试的优点进行了描述。采用弯曲单元法测量剪切模量,间接观察颗粒结构的变化。此外,使用扫描电子显微镜直接观察颗粒结构。从这项工作中可以得出以下结论。应变路径控制试验的优点在于:试件的应变和超静孔压可以自由控制,即使在大应变范围内也能保持均匀;可以精确控制粘土的排水模式和K_0固结模式,缩短试验时间.应变路径控制的K_0固结试验结果表明,更新世粘土具有非常典型的固结特性,孔隙比减小 ...更多信息 艾德在预固结应力后迅速膨胀。这种行为在重构高岭土样品中不明显。K_0值在达到固结前应力时下降,随后迅速上升,并趋于稳定值。这似乎是由于在预固结应力之后粘土中发生的结构性变化。在K_0固结试验过程中,剪切模量G逐渐增大到100(MPa),之后基本保持不变。在G中,这个变化点的孔隙比恰好与在预固结应力之后快速变化的孔隙比一致。这种变化的主要原因可以被认为是更新世粘土的结构性变化显着的预固结应力后.利用扫描电子显微镜(SEM)观察了更新世粘土的微观结构。尽管在测试前的样品中观察到完整的硅藻,但在测试后采集的样品中观察到大量被破坏的硅藻。可以认为,硅藻骨架的破坏是前期固结应力作用后孔隙比迅速减小的原因之一。在本研究中,没有观察到粘土颗粒的连接结构的变化,这被认为是在前期固结应力附近的孔隙比迅速降低的另一个原因。少

项目成果

期刊论文数量(18)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Uchida.K., Stedman, D.J., Shimizu, M.: "Strain-Path Controlled Ko Consolidation Test of Marine Clays with Bender Element"Proc.14^<th> Int.Offshore and Polar Eng.Conf.. ISOPE2004-TM10(CD-ROM). (2004)
Uchida.K.、Stedman, D.J.、Shimizu, M.:“使用 Bender 元件对海洋粘土进行应变路径控制 Ko 固结试验”Proc.14^<th> Int.Offshore and Polar Eng.Conf.. ISOPE2004-TM10(
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Uchida.K., Stedman, D.J., Sakagami, T.: "Strain-path Control Ko Consolidation of Marine Clays"Proc.13^<th> Int.Offshore and Polar Eng.Conf.. ISOPE2003-TM20(CD-ROM). (2003)
Uchida.K.、Stedman, D.J.、Sakagami, T.:“海洋粘土的应变路径控制 Ko 固结”Proc.13^<th> Int.Offshore and Polar Eng.Conf.. ISOPE2003-TM20(CD-ROM)
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Uchida.K., Sakagami, T., Yoshiizumi, N: "Soil Behavior under Strain-Path Controlled Triaxial Test"Proc.3rd Internl.Symon Deformation Characteristics of Geomaterials. Vol.2(CD-ROM). (2003)
Uchida.K.、Sakagami, T.、Yoshiizumi, N:“应变路径控制三轴试验下的土壤行为”Proc.3rd Internl.Symon 土工材料变形特征。
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Uchida.K., Stedman, D.J., Sakagami, T.: "Strain-path Control Ko Consolidation of Marine Clays"Proc.13^<th> Int.Offshore and Polar Eng.Conf.. (CD-ROM). ISOPE2003-TM20 (2003)
Uchida.K.、Stedman, D.J.、Sakagami, T.:“海洋粘土的应变路径控制 Ko 固结”Proc.13^<th> Int.Offshore and Polar Eng.Conf.(CD-ROM)。
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    0
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Uchida.K., Sakagami, T., Yoshiizumi, N: "Soil Behaviour under Strain-Path Controlled Triaxial Test"Proc.3rd International Symposium on Deformation Characteristics of Geomaterials. CD-ROM(Vol.2). (2003)
Uchida.K.、Sakagami, T.、Yoshiizumi, N:“应变路径控制三轴试验下的土壤行为”Proc.第三届土工材料变形特征国际研讨会。
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UCHIDA Kazunori其他文献

UCHIDA Kazunori的其他文献

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{{ truncateString('UCHIDA Kazunori', 18)}}的其他基金

Numerical Study on Characteristics of Electromagnetic Wave Propagation along Random Rough Surface
电磁波沿随机粗糙表面传播特性的数值研究
  • 批准号:
    21560421
  • 财政年份:
    2009
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Confirmation and verification for blend technique for impermeable soil material of core zone with environmentally-friendly, low cost and mechanical stable
环保、低成本、力学稳定的核心区防渗土材料掺合技术确认与验证
  • 批准号:
    20380135
  • 财政年份:
    2008
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Basic Research Related to Spread Use of Sensor Network
传感器网络普及相关基础研究
  • 批准号:
    17560354
  • 财政年份:
    2005
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Research of Improving Technology for lmigation Embankments with Environmental Friendly and Earthquake Resistant Design at Low Cost
环保抗震低成本灌溉堤坝改良技术研究
  • 批准号:
    16208024
  • 财政年份:
    2004
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Integrated Evaluation for Earthquake Resistance of Embankmet Dams Damaged by the 1995 Hyogoken-Nanbu Earthquake and Application of the Research Results to Engineering Education
1995年兵库县南部地震受损堤坝抗震综合评价及研究成果在工程教育中的应用
  • 批准号:
    10556052
  • 财政年份:
    1998
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Strain Distribution Measurement on a Surface of Soil Sample by Laser Speckle Method and Limit State Design of Soil Structures
激光散斑法测量土样表面应变分布及土结构极限状态设计
  • 批准号:
    03452271
  • 财政年份:
    1991
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
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