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在室内实验下,对未和季节性永久土的冬季基础支结构的冬季强力进行数值模拟研究
Haotian Guo1,2, Xinzhu Zhao1, Chao Sun1
1School of Geomatics and Prospecting Engineering, Jilin Jianzhu University, Jilin Changchun 130118, People's Republic of China.
Royal Society open science
|November 21, 2024
概括
阴性温度在深层基础坑中显著影响不和土壤机制. 使用室温数据导致过冬坑建设分析不准确,负温度增加了变形和起力的力量.
科学领域:
- 地质技术工程 地质技术工程
- 土壤力学 土壤力学
- 土木工程 土木工程是指土木工程.
背景情况:
- 在负温度下对深层基础坑结构的准确分析对于过冬的稳定性至关重要.
- 在负温度下对不和土壤使用和土壤参数引入了显著的不准确性.
- 了解结条件下的不和土壤的机械行为对于基础设施安全至关重要.
研究的目的:
- 为了研究负温度对不和土壤机械参数的影响,用于过冬的深层基础坑结构.
- 在不同温度条件下分析基础坑支结构的应力和变形.
- 将数值模拟结果与实际监测数据进行比较,以验证模型.
主要方法:
- 室内实验,以获得不和土壤的强度参数.
- 基于实验数据创建一个基础坑模型的FLAC3D数值模拟软件.
- 分析不同温度场景下的应力,变形和起力.
主要成果:
- 长春的泥土的矩阵吸收大约为70kPa.
- 温度下降增加了总凝聚力,并降低了不和土壤的内部摩擦角度.
- 支结构的水平移位随着挖掘而增加,在三分之二的深度达到顶峰.
- 在负温度下变形更大,尤其是在使用实际温度的机械参数时.
结论:
- 负温度显著改变不和土壤的机械性能,导致深层基础坑支结构的变形增加.
- 结合实际温度依赖的机械参数的数值模拟提供了比使用室温数据的更准确的预测.
- 随着挖掘,起的力量会增加,在坑底有显著的激增,特别是在长时间在-20°C下结的情况下.
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