饱和粉细砂层锚索预应力变化规律监测分析

发布时间：2018-01-11 06:30

本文关键词：饱和粉细砂层锚索预应力变化规律监测分析　出处：《岩土力学》2014年S1期 　论文类型：期刊论文

【摘要】：锚索的预应力损失在工程建设中不可忽视,工程的场地环境条件成为影响锚索预应力损失的主因。饱和粉细砂层较其他地质条件更为复杂敏感,更易引起锚索预应力值的损失。通过对廊坊市某深基坑工程锚索预应力值的实时监测,结合工程环境,分析饱和粉细砂层中造成锚索预应力值变化的原因。结果表明,施工过程、张拉过程以及环境因素都影响锚索预应力的变化,其中开挖过程的影响最明显,预应力值的变化率最大值达79.1%;瞬时卸载造成预应力值22.8%~59.2%的损失。对饱和粉细砂层中锚索预应力变化规律的研究分析结论可为类似地质环境的工程建设提供经验。
[Abstract]:The prestressing loss of anchor cable can not be ignored in engineering construction. The site environment condition of the project becomes the main factor that affects the prestressed loss of anchor cable. The saturated silt layer is more complex and sensitive than other geological conditions. It is easier to cause the loss of anchor cable prestress value. Through the real-time monitoring of anchor cable prestress value of a deep foundation pit project in Langfang City, combined with the engineering environment. The reason of the change of anchor cable prestress value in saturated silty sand is analyzed. The results show that the construction process, tension process and environmental factors all affect the change of anchor cable prestress, among which the excavation process has the most obvious effect. The maximum change rate of prestress value is 79.1%. Instantaneous unloading results in a loss of 59.2% of the prestress value. The research and analysis of the variation law of anchor cable prestress in saturated silty sand layer can provide experience for the engineering construction similar to geological environment.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;北京现代金宇工程建设有限公司;
【基金】：国家自然科学基金资助(No.51274209,No.U1261212) 国家科技支撑计划项目课题资助(No.2012BAK24B0201) 中央在京高校重大成果转化项目资助(2012年)
【分类号】：TU476
【正文快照】： 1引言预应力锚固技术充分利用岩土体自稳能力,减小支护结构体的截面积并分担荷载,具有良好的经济效益和社会效益,在工程建设中广泛应用。在大中型城市建设中,土地匮乏且深基坑工程毗邻其他施工建筑物使得预应力锚固技术成为支护的首选。但是,预应力锚索的加固效果受很多因素的

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