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土钉墙是一种边开挖边支护的支护方式。其设计、施工过程中包含很多随机、不确定性因素,准确评估它的变形大小是极为困难的。全面介绍了13个黏土中类似基坑工程土钉墙实例,包括它们的工程勘察、设计方案、施工、监测、竣工资料。通过分析这些资料,得出基坑最大水平位移大多小于0.7%倍的开挖深度等的一些结论,并提出软土层影响系数和土钉刚度系数两个概念,用实例数据证实了当软土层影响系数增加或当土钉刚度系数减少时,土钉墙变形有增大的趋势。
Soil nailing wall is a side of the support while supporting excavation. Its design, construction process contains a lot of random, uncertain factors, accurate assessment of its deformation is extremely difficult. A full account of 13 examples of soil nailing walls for similar foundation pit engineering in 13 clays, including their engineering investigation, design proposal, construction, monitoring and completion data. Based on the analysis of these data, some conclusions such as the excavation depth of the maximum horizontal displacement of excavation mostly less than 0.7% times are obtained. Two concepts of influence coefficient of soil layer and soil nailing stiffness coefficient are proposed. When the influence coefficient of layer increases or the rigidity coefficient of soil nail decreases, the deformation of soil nailing wall tends to increase.