基于高应变动态试验方法的堆再冷过程和承载能力的协同变化定律的分析
Dezhong Yu1, Yang Cao1, Qianqian Zhao2
1School of Urban Construction, Zhejiang Shuren University, Hangzhou, 310015, Zhejiang, China.
Scientific reports
|November 5, 2023
概括
高应变动态试验方法可靠地评估永久土地区的基承载能力. 这种方法在静态负荷测试中得到了验证,可以准确预测堆土重结后的容量,从而随着时间的推移提高轴承强度.
科学领域:
- 地质技术工程 地质技术工程
- 永久土工程 永久土工程
- 基金会工程工程基金会工程
背景情况:
- 永久土地区的基面临着由于融周期和土壤特性变化的挑战.
- 准确评估承载能力对于结构在寒冷环境中的安全性和寿命至关重要.
- 高应变动态测试为评估基础性能提供了快速有效的替代传统方法.
研究的目的:
- 调查高应变动态试验方法的可靠性,以确定永久土中的基承载能力.
- 分析堆土重结对承载能力的影响,并建立动态测试的模型参数.
- 为了验证高应变动态测试方法与静态负载测试在现实世界永久土建筑场景.
主要方法:
- 建设和测试四个15米长,直径1.0米的测试堆在达兴安山脉永久土地区.
- 对地面温度的监测,以评估土的重新结状态.
- 在重新结之前和之后,进行静态负载测试以确定摩擦阻力和承载能力.
- 使用CAPWAPC程序应用和校准高应变动态测试方法.
主要成果:
- 在大约-1.9°C的永久土中堆积土壤的重新结是一个缓慢的过程,大约需要120天.
- 校准的高应变动态测试结果,使用从静态测试中获得的参数,与测量数据显示出很好的一致性.
- 该研究确定了在高应变动态测试中用于堆土模型的关键土壤参数 (弹性极限,阻力).
结论:
- 具有校准参数的高应变动态测试方法可靠,用于快速评估永久土地区的最终承载能力.
- 土重结显著提高了基础承载能力,该过程与增强强度有积极的相关性.
- 在重新结过程中温度场的变化直接影响土结强度,这强调了热监测的重要性.
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