软层状黏土取样扰动效应

IF 0.3 Q4 ENGINEERING, GEOLOGICAL Geotechnical Engineering Pub Date : 2003-10-01 DOI:10.1680/GENG.2003.156.4.213
M. Long
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引用次数: 15

摘要

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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Sampling disturbance effects in soft laminated clays
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...
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来源期刊
Geotechnical Engineering
Geotechnical Engineering ENGINEERING, GEOLOGICAL-
CiteScore
0.50
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0.00%
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0
期刊介绍: The objectives of the Association shall be the promotion of co-operation among geotechnical societies in SE Asia; and the assistance to member societies who have limited number of members. Now there is only one combined web titled: AGSSEA-SEAGS. SEAGS & AGSSEA encourage the submission of scholarly and practice-oriented articles to its journal. The journal is published quarterly. Both sponsors of the journal, the Southeast Asian Geotechnical Society and the Association of Geotechnical Societies in Southeast Asia, promote the ideals and goals of the International Society of Soil Mechanics and Geotechhnical Engineering in fostering communications, developing insights and enabling the advancement of the geotechnical engineering discipline.
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