土层参数对双圆盾构衬砌内力的影响

Impact of Soil Parameters on Internal Forces in Lining of DOT Shield

双圆盾构纠偏过程会引起已拼接管片内力的复杂变化,土质参数还会影响到纠偏的效果。针对这些问题,采用弹塑性有限元数值方法,分析土质参数对纠偏前后衬砌结构内力的影响以及土质参数对纠偏效果的影响。结果表明,内摩擦角是影响衬砌内力最敏感的因素,随着内摩擦角的增大,施加相同大小纠偏力产生的纠偏效果越来越不显著,纠偏引起衬砌内力发生较大改变,某些节点的内力增大,有些节点的内力减少甚至发生符号的反转。

Correction process in Double-O-Tube （DOT） construction causes complex changes in the internal forces of lining segment, and soil parameters also impact correction result. To solve these problems, the finite element method is adopted to analyze the impact of soil parameters on the internal forces in lining before and after correction, and the impact of soil parameters on correction result. The results show that friction angle is the most sensitive factor affecting the internal force in lining. With the friction angle increases, correction result is increasingly less obvious under the same correctionforce, the correction causes the internal force in lining to change greatly and the internal force increases at some points, and decreases at other points, or even sign reversal occurs.