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The relation between the state indices and the characteristic features of undrained behaviour of silty sand

机译：状态指数与粉砂不排水特性特征之间的关系

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The characteristic features of a series of isotropically and K-0-consolidated undrained triaxial compression behaviour of a silty sand were investigated for a range of initial void ratio (e) and mean effective confining stress (p'). The silty sand used in this study contained about 10% natural fines. The critical state line (CSL) of K-0-consolidated specimens, K0U was slightly lower than the CSL for isotropically consolidated specimens, CIU. The respective CSLs for K0U and CIU were used to define state indices, such as state parameter (psi), state index (I-s), state pressure index (I-p) and modified state parameter (psi(m)), within critical state soil mechanics (CSSM) framework. It was found that each state index exhibit a unique relation with liquefaction potential, irrespective of consolidation type, however different relationships were observed between state indices and the stress ratio at the triggering of liquefaction, eta(IS) is or the liquefaction resistance, q(IS). The correlation of characteristic features of undrained shearing (i.e., liquefaction potential, eta(IS) is and q(IS)) and drained shearing (maximum rate of volume change, (d epsilon(v)/d epsilon(a))(max)) with state indices were compared statistically in terms of root mean square deviations (RMSD). All characteristic features of undrained shearing generally showed the best correlation with I-p in term of RMSDs, however psi showed comparatively wider scatter for the specimens showing flow and limited flow behaviour. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在一系列初始空隙率（e）和平均有效围压（p'）范围内，研究了粉砂的一系列各向同性和K-0固结不排水三轴压缩特性。本研究中使用的粉砂含大约10％的天然粉。 K-0固结试样的临界状态线（CSL）K0U略低于各向同性固结试样CIU的临界状态线（CSL）。在临界状态土壤力学中，分别使用K0U和CIU的CSL来定义状态指数，例如状态参数（psi），状态指数（Is），状态压力指数（Ip）和修改后的状态参数（psi（m））。 （CSSM）框架。已经发现，每个状态指数与液化势均显示出独特的关系，而与固结类型无关，但是在状态指数与引发液化的应力比eta（IS）为或抗液化性q（是）。不排水剪切（即液化势，eta（IS）is和q（IS））与排水剪切（最大体积变化率，（d epsilon（v）/ d epsilon（a））（max）的特征之间的相关性））与状态指标的均方根偏差（RMSD）进行了统计比较。就RMSD而言，不排水剪切的所有特征通常显示出与I-p的最佳相关性，但是psi显示出显示流动和有限流动行为的试样的散射相对较宽。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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