基于SCPTU原位状态参数确定方法及液化应用试验研究

doi:10.13722/j.cnki.jrme.2018.0269

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摘要状态参数可以有效地评价无黏性土的相对密实度和液化势。然而，目前状态参数的确定主要依赖于室内试验，难以反映现场土层的真实状态。地震波孔压静力触探(SCPTU)测试可以获取土层的原位锥尖阻力、侧壁摩阻力、孔隙水压力与剪切波速等原位参数。本文基于SCPTU测试确定状态参数的研究成果，根据3个工程场地的SCPTU原位测试资料，首先对不同状态参数评估方法进行了比较，其次建立归一化剪切波速Vs1与原位状态参数的相关关系，绘制剪切波速与有效应力(Vs-?′v0)平面中状态参数剖面等值线图；提出归一化小应变刚度(G0 /qc)与状态参数的修正模型。最后应用于无黏性土密实度与液化势的评估中。结果表明：本文提出的2种计算方法能够有效地评估无黏性土的状态参数，并且预测的状态参数可有效地用于评价土体密实状态与液化势的可靠判别。

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	段伟1
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	蔡国军1
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	刘松玉1
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	邹海峰1
	2
	袁俊1
	2

关键词 ：土力学, 地震波孔压静力触探(SCPTU), 原位, 状态参数, 相对密实度, 液化

Abstract：The state parameter can be used to effectively evaluate the relative density and liquefaction potential of the cohesionless soil. However，at present，the determination of state parameter is mainly dependent on laboratory tests，and it is difficult to reflect the real state of the field. The seismic wave piezocone test(SCPTU) can provide in-situ parameters such as cone tip resistance，sleeve friction resistance，pore water pressure and shear wave velocity. Based on the research results of SCPTU testing to determine the state parameter and SCPTU testing data of the three sites，firstly，the different evaluation methods of state parameter are compared，secondly，the correlation between the normalized shear wave velocity(Vs1) and in-situ state parameter is established，and the contour lines of state parameter profile in the plane of the shear wave velocity and the effective vertical stress(Vs-?′v0) are drawn，thirdly，the revised model of the relationship between normalized small strain stiffness(G0/qc) and state parameter has been proposed. Finally，these proposed methods are applied to the evaluation of the density and liquefaction potential of the cohesionless soil. The results show that the two calculation methods proposed in this paper can effectively evaluate the state parameter of the cohesionless soil，and the state parameter evaluated can be effectively used for evaluating the dense state and reliably discriminating liquefaction potential.

Key words： soil mechanics seismic wave piezocone test(SCPTU) in situ state parameter relative density liquefaction

引用本文:

段伟1，2，蔡国军1，2，刘松玉1，2，邹海峰1，2，袁俊1，2. 基于SCPTU原位状态参数确定方法及液化应用试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 3151-3162.
DUAN Wei1，2，CAI Guojun1，2，LIU Songyu1，2，ZOU Haifeng1，2，YUAN Jun1，2. Experimental study on determination method in-situ state parameter and it liquefaction application based on SCPTU. , 2019, 38(S1): 3151-3162.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0269 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3151

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