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原状与重塑粉土固结不排水剪切特性的对比试验

ISSN号：0559-9350
期刊名称：《水利学报》
时间：0
分类：TV441[水利工程—水工结构工程]
作者机构：[1]大连理工大学海岸和近海工程国家重点试验室,辽宁大连116024, [2]大连理工大学土木工程学院,辽宁大连116024
相关基金：国家自然科学基金重点资助项目（50639010）;国家自然科学基金青年基金项目（50808033）

关键词：粉土, 干装法, 湿装夯实法, 静力三轴试验, 应力-应变关系, 有效应力路径, 抗剪强度指标, silt, dry sampling sampling method, wet tamping method, static tri-axial tests, the relation of stress and offective strain, effective stress path, shear resistance index

中文摘要：

利用应变控制式静力三轴剪切仪,对3组夯实原状饱和粉土试样进行了不同围压下固结不排水剪切试验,在此基础上,又采用干装法和控制固定含水率的湿装夯实法制备了相同干密度的重塑饱和粉土试样,对两种方法制成的试样进行了同样的对比试验。通过对原状试样与不同成样方法的重塑试样的应力-应变关系、有效应力路径和抗剪强度指标等试验结果的对比分析,探讨了两种室内成样方法制备重塑试样的试验结果与原状试样结果的差别以及产生的原因。试验结果表明：在3组对比试验中,两种重塑样之间、重塑样原状样之间的应力-应变关系和有效应力路径均差异较大,湿装重塑样的抗剪强度指标均低于干装重塑样,两种重塑样抗剪强度指标均低于原状样。有效固结后的密实程度并不是导致试验结果差异的根本原因。原状样和重塑样固结过程的孔压消散曲线及正常固结线均有所不同,说明原状样和重塑样的结构不同,是导致试验结果不同的根本原因。

英文摘要：

Based on the consolidation un-drained shear tests on three kinds of undisturbed saturated silt under different confined pressures,a set of comparative tests were conducted on remolded saturated silt prepared by dry sampling sampling method and wet tamping method controlling the same water content under the same dry density by strain-controlled static tri-axial shear apparatus.By comparative analysis of the stress-strain-relation,shear resistance indexes,effective stress path of intact specimen and remolded specimen,the difference of results between remolded specimens with two sampling preparation methods and undisturbed specimen,as well as the cause of the difference were studied.The test results show that the stress and strain relations and the stress path of remolding specimen prepared by two methods were different from intact specimen.The indexes of shear resistance obtained by wet tamping method were lower than dry sampling method and they were both lower than intact specimen.The density after consolidation was not the crucial reason leading to the different results.The dissipation curve of pore water pressure under consolidation and normal consolidation line of remolded specimen were different from intact specimen,indicating the difference of the structure of specimen,which is the primary cause of the different test results.

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