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中文摘要：
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.
英文摘要：
During the construction of shielding,the soil around is disturbed by shearing,and the structure is destroyed.For the soil with strong structure,the effect of disturbance on it is more obvious.In this paper,the structure of soil is simulated by different cement contents,and the secondary consolidation tests of step loading are conducted.The test results indicate that compression index decreases with the increase of cement content,and when the content of cement is large,the compression index apparently decreases compared with that in the situation of less cement content.It is also shown that the structure yield stress grows along with the increase of cement content.The calculated value using the proposed formula of secondary consolidation coefficient coincides with the test value,which indicates that the established model of secondary consolidation coefficient considering the structure of soil is somewhat reasonable and will be useful for the forecast of secondary consolidation settlement in engineering practice.
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