沉管隧道施工期沉降监测分析及基础层模型试验研究
发布时间：2018-08-16 08:26
【摘要】：沉管隧道施工期沉降、基础层沉降的研究,是沉管隧道沉降研究的重要组成部分。更好的了解沉降特别是施工沉降的规律和特征,有助于提高施工质量,保证运营安全。本文主要通过实测数据分析、案例统计分析,对沉管隧道施工期沉降规律和施工影响展开研究,通过缩尺寸模型试验,模拟水下环境和灌砂法施工工艺下基础层的形成和压缩,研究不同条件下的基础层压缩特性。基于研究结果总结沉降原因,提出控制沉降的可行建议。 本文主要结论和创新点如下： (1)施工期间沉降占总沉降的比例平均值为55.9%。施工期间管节纵向的沉降非常不均匀,工后沉降相对较连续,施工期间的不均匀沉降在工后被放大。 (2)施工期间沉降随时间变化有明显折点,基础层压缩和下卧土层压缩在完成时间上有差异,施工期间的不均匀沉降受施工工序和累计沉降影响。 (3)模拟工况下测得砂石基础层平均压缩模量为3.26MPa,施工过程中砂石的相互作用对整体压缩模量产生约4.4倍的增幅,整体压缩量与基础层密实度有关。 (4)基槽内回淤在压缩中起类似润滑剂的作用,能扩大压缩的不均匀性,仅少量回淤存在,影响就非常明显,模拟工况中回淤条件下基础层压缩模量约为无回淤条件的0.6倍。
[Abstract]:The research on settlement of submersible tunnel and foundation layer is an important part of settlement study of immersed tunnel. A better understanding of the rules and characteristics of settlement, especially the settlement of construction, will help to improve the quality of construction and ensure the safety of operation. Through the analysis of measured data and statistical analysis of cases, this paper studies the settlement law and construction effect of immersed tunnel during construction period, and simulates the formation and compression of foundation layer under underwater environment and sand filling construction technology through the model test of shrinking size. The compression characteristics of foundation layer under different conditions are studied. Based on the research results, the causes of settlement are summarized, and some feasible suggestions for controlling settlement are put forward. The main conclusions and innovations of this paper are as follows: (1) the average value of the proportion of settlement to total settlement during construction is 55.9. The longitudinal settlement of pipe joints during construction is very uneven, and the settlement after construction is relatively continuous, and the uneven settlement during construction is amplified after construction. (2) during construction, the settlement varies obviously with time. There is a difference in the completion time between the foundation layer compression and the underlying soil compression. The uneven settlement during construction is affected by the construction procedure and the cumulative settlement. (3) the average compressive modulus of the sand and stone foundation is 3.26MPa, and the interaction of sand and stone increases the overall compression modulus by about 4.4 times. The integral compression amount is related to the compactness of the foundation layer. (4) the siltation in the base groove acts as a lubricant in the compression, which can enlarge the inhomogeneity of the compression. Only a small amount of desilting exists, and the effect is very obvious. The compression modulus of the foundation layer in the simulated condition is about 0.6 times as high as that in the non-silting condition.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3;U459.5
[Abstract]:The research on settlement of submersible tunnel and foundation layer is an important part of settlement study of immersed tunnel. A better understanding of the rules and characteristics of settlement, especially the settlement of construction, will help to improve the quality of construction and ensure the safety of operation. Through the analysis of measured data and statistical analysis of cases, this paper studies the settlement law and construction effect of immersed tunnel during construction period, and simulates the formation and compression of foundation layer under underwater environment and sand filling construction technology through the model test of shrinking size. The compression characteristics of foundation layer under different conditions are studied. Based on the research results, the causes of settlement are summarized, and some feasible suggestions for controlling settlement are put forward. The main conclusions and innovations of this paper are as follows: (1) the average value of the proportion of settlement to total settlement during construction is 55.9. The longitudinal settlement of pipe joints during construction is very uneven, and the settlement after construction is relatively continuous, and the uneven settlement during construction is amplified after construction. (2) during construction, the settlement varies obviously with time. There is a difference in the completion time between the foundation layer compression and the underlying soil compression. The uneven settlement during construction is affected by the construction procedure and the cumulative settlement. (3) the average compressive modulus of the sand and stone foundation is 3.26MPa, and the interaction of sand and stone increases the overall compression modulus by about 4.4 times. The integral compression amount is related to the compactness of the foundation layer. (4) the siltation in the base groove acts as a lubricant in the compression, which can enlarge the inhomogeneity of the compression. Only a small amount of desilting exists, and the effect is very obvious. The compression modulus of the foundation layer in the simulated condition is about 0.6 times as high as that in the non-silting condition.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3;U459.5
【参考文献】
相关期刊论文 前10条
1 魏立新;郭建民;刘宇晨;刘力英;曹建新;;广州市洲头咀隧道工程总体设计[J];城市道桥与防洪;2007年05期
2 诸\，
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