• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Pan-American conference on unsaturated soils >Uplift resistance and mobilization of buried pipelines in unsaturated sands
【24h】

Uplift resistance and mobilization of buried pipelines in unsaturated sands

机译：Undrated Sands中埋入管道的隆起抗性和动员

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

摘要

Pipelines are commonly buried in depth of lm to 2m in which the soil condition is most often partially saturated. However, the conventional design guidelines and available analytical models for predicting the uplift resistance and mobilization are based on assumption that the soil is either dry or fully saturated. In unsaturated soils, such an assumption often leads to under-estimate of uplift resistance and over-estimation of uplift mobilization. Enhanced strength and stiffness of unsaturated soils due to suction can increase the uplift resistance along with substantially different peak mobilizations as compared to tradition estimations. This can lead to under or over-estimation of remedial measures during feasibility/design stage, thus false bidding/project estimations. This paper examines the effect of partial saturation on the peak uplift resistance and mobilization of pipelines buried in sandy soils using numerical modelling. Two-dimensional finite element (FE) analyses were conducted on the basis of steel pipeline buried in unsaturated finer sand behaviour of which was modelled using modified Mohr-Coulomb model. Firstly, the numerical model was validated against the reported full scale test data, and then the analyses were extended for various pipe sizes, cover heights and degree of saturations of sands. Results showed that the peak-mobilization can be significantly different than that suggested by current guidelines, and strongly depend on the factors considered in the current study.
机译：管道通常深入埋入LM至2M的深度，其中土壤条件最常是部分饱和的。然而，传统的设计指南和用于预测升压和动员的可用分析模型是基于土壤干燥或完全饱和的假设。在不饱和的土壤中，这种假设通常导致抬高电阻和隆起动员过度估计的估计。与传统估计相比，由于抽吸引起的不饱和土的强度和刚度的强度和刚度可以增加隆起的电阻以及基本上不同的峰流动。这可能导致可行性/设计阶段期间的补救措施的下降或过度估计，因此是错误的竞标/项目估算。本文研究了数值模拟局部饱和对诸着埋地砂土埋地峰值升力抗性和动员的影响。在使用修改的Mohr-Coulomb模型建模的不饱和更细沙行为中埋入的钢水管道进行二维有限元（Fe）分析。首先，对报告的全规模测试数据验证了数值模型，然后延长了分析，用于各种管道尺寸，覆盖砂岩的饱和度和饱和度。结果表明，峰动员可以显着不同于当前指南建议的结果，强烈取决于当前研究中考虑的因素。

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