基于等效骨架孔隙比指标的饱和砂类土抗液化强度评价

吴琪; 陈国兴; 朱雨萌; 周正龙; 周燕国

doi:10.11779/CJGE201810019

基于等效骨架孔隙比指标的饱和砂类土抗液化强度评价 English Version

1. 南京工业大学岩土工程研究所,江苏南京 210009;
2. 江苏省土木工程防震技术研究中心,江苏南京 210009;
3. 浙江大学岩土工程研究所,浙江杭州 310058

基金项目: 国家自然科学基金项目（41172258; 51438004）; 国家重点基础研究发展计划（“973”计划）项目（2014CB047005）

详细信息

作者简介:
吴琪(1991- ),男,博士研究生,主要从事混合料动力特性研究。E-mail：qw09061801@163.com。

通讯作者:
陈国兴，E-mail：gxc6307@163.com

中图分类号: TU43
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出版历程
- 收稿日期: 2017-07-13
- 发布日期: 2018-10-24

Evaluating liquefaction resistance of saturated sandy soils based on equivalent skeleton void ratio

1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China;
3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 为探讨各类饱和砂类土的物理特性对其抗液化强度CRR的影响,将具有不同细粒含量FC的福建、南京和南通砂类土分为3组：①相同的相对密度D_r;②相同的孔隙比e;③相同的骨架孔隙比e_sk。对具有不同物理特性的三类饱和砂类土进行了一系列均等固结不排水循环三轴试验,结果表明：e或D_r相同的饱和砂类土的CRR随FC的增加而降低;但e_sk相同的砂类土的CRR随FC的增加而增大。结合文献中十类砂类土的CRR试验数据,分析表明：各类饱和砂类土的CRR随其等效骨架孔隙比 $e_{\text{sk}}^{*}$ 的增大而单调地降低,且两者呈现较好的幂函数关系。这表明能综合反映砂类土颗粒组成,密实状态和粗细粒接触状态的 $e_{\text{sk}}^{*}$ 是表征饱和砂类土CRR的一个有效物理特性指标;并首次发现饱和砂类土的CRR- $e_{\text{sk}}^{*}$ 关系曲线的最佳拟合参数A和B值由砂粒和细粒的物理特性共同决定。据此,饱和砂类土的CRR可仅由其物理特性指标较好地预测。
- 饱和砂类土 /
- 抗液化强度 /
- 物理特性指标 /
- 等效骨架孔隙比
Abstract: In order to investigate the effect of physical properties on liquefaction resistance CRR, different types of saturated sandy soils (Fujian, Nanjing and Nantong sandy soils with different fines contents (FC)) are categorized as three different cases: (1) a fixed relative density D_r; (2) a fixed void ratio e; (3) a fixed skeleton void ratio e_sk. A series of isotropically consolidated undrained cyclic triaxial tests are performed on the three saturated sandy soils with various physical properties. The test results show that an increase in FC causes a decrease in CRR of saturated sandy soils at a constant D_r or e, and the CRR at a constant e_sk will increase with the increase of FC. Based on the test data here and from ten classified saturated sandy soils in the literatures, it is found that the CRR decreases monotonically with the increase of the equivalent skeleton void ratio $e_{\text{sk}}^{*}$ , and a power relationship between CRR and $e_{\text{sk}}^{*}$ is then obtained, which means $e_{\text{sk}}^{*}$ , synthesizing the nature of grain-size distribution, density state and intergrain contact, is an appropriate index of physical properties for evaluating the CRR of sandy soils. Moreover, it is first discovered that the best-fit parameters A and B of CRR- $e_{\text{sk}}^{*}$ correlation can be determined uniquely in terms of index properties of sand grains and fine grains for sandy soils. Consequentely, the CRR value of sandy soils can be captured only using index properties.
- saturated sandy soil /
- liquefaction resistance /
- index property /
- equivalent skeleton void ratio

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