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盾构施工过程中会对周围土体产生剪切扰动,破坏土体的结构性,结构性越强的土,其受扰动作用的影响就越明显.本文通过配制不同水泥掺量来模拟土体结构性的强弱,并进行分级加载的次固结试验.试验结果表明:压缩指数随着水泥掺量的增加而减小,水泥掺量较大时,压缩指数与水泥掺量较小时相比明显减小;结构屈服应力随着水泥掺量的增加而增大;本文所提出的次固结系数公式的计算值与试验值较为吻合,说明本文建立的考虑土体结构性的次固结系数计算模型具有一定的合理性,可为工程实践中次固结沉降的预测提供一定的理论指导.
In the process of shield construction, shearing disturbance will occur on the surrounding soil, which will damage the structure of the soil and the more structurally affected soil, and the more obvious it is to be disturbed.In this paper, different amounts of cement are formulated to simulate soil Structural strength and sub-consolidation test graded loading test results show that: the compression index decreases with the increase of cement content, cement content is larger, the compression index and cement content is smaller The structure yield stress increases with the increase of cement content. The calculated value of sub-consolidation coefficient formula proposed in this paper is in good agreement with the experimental value, indicating that the secondary consolidation coefficient The calculation model has a certain rationality, which can provide some theoretical guidance for the prediction of secondary consolidation settlement in engineering practice.