• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Geo-Congress >Unified Assessment of Stress Scaling Factors for Liquefaction Engineering Problems
【24h】

Unified Assessment of Stress Scaling Factors for Liquefaction Engineering Problems

机译：液化工程问题应力比例因子的统一评估

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Most of the widely used seismic soil liquefaction triggering methods propose cyclic resistance ratio (CRR) values valid at a reference normal effective stress (σ′_(v,0) of one atmosphere, and a zero static shear stress (τ_(st,0)) state. Then a series of correction factors are applied to the CRR, to account for the effects due to variations from the reference normal effective and static shear stresses (i.e. K_σ and K_α corrections). In the literature, there exist a number of stress correction factors used for seismic soil liquefaction triggering assessment. However, the presence of a wide range of them, some of which even exhibit contradicting trends, suggests that more research needs to be performed to reduce this uncertainty. Additionally, these stress correction factors are treated as being strain-independent and are applied disjointedly to CSR or CRR. The main motivation of this on-going study is defined as to develop a strain-dependent semi-empirical framework to assess combined effects of ⅰ) σ′_(v,0), ⅱ) τ_(st,0) acting on the plane, where cyclic shear stresses either produce ⅲ) shear stress reversal or not. For this purpose, cyclic simple shear tests were performed on laboratory reconstituted sand samples. Additionally, cyclic test data were compiled from the available literature. On the basis of probabilistic assessment of this data, a unified correction scheme, which incorporates the interdependent effects of both overburden and static shear stresses along with the degree of cyclic shear stress reversal, has been developed.
机译：大多数广泛使用的地震土液化触发方法提出了在一个大气的参考法向有效应力（σ'_（v，0）和零静态剪应力（τ_（st，0））下有效的循环阻力比（CRR）值））状态，然后将一系列校正因子应用于CRR，以解决由于相对于参考法向有效和静态剪应力的变化而产生的影响（即K_σ和K_α校正）。用于地震液化触发评估的应力校正因子，但是，由于存在多种应力校正因子，其中一些甚至呈现出相互矛盾的趋势，因此，需要进行更多的研究以减少这种不确定性。被视为与应变无关，并被不加区分地应用于CSR或CRR。这项正在进行的研究的主要动机是，建立一个应变相关的半经验框架，以评估综合效用。 ⅰ）σ'_（v，0），ⅱ）τ_（st，0）的影响作用在平面上，在该平面上，周期性剪应力或不产生ⅲ）剪应力反转。为此，对实验室重建的砂样品进行了循环简单剪切试验。此外，循环测试数据是从现有文献中收集的。在对这些数据进行概率评估的基础上，开发了一种统一的校正方案，该方案结合了上覆和静态剪应力的相互依存关系以及循环剪应力的反转程度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号