基于能量法的双圆盾构施工引起管线沉降计算

引入隧道与开挖面的相对位置系数α,研究双圆盾构施工在不同工况下引起的深层土体沉降计算公式,以土体沉降计算公式为基础建立能量变分方程,得到双圆盾构施工引起地下管线沉降的计算方法。通过算例对比分析4种典型工况下管线沉降的分布规律,验证公式推导结果正确性,并进一步分析了管线埋深和土体损失率等因素对管线最大沉降的影响规律。研究结果表明:本文方法计算3种正常工况下的管线沉降曲线满足正态分布,旋转工况下管线沉降分布不均匀,最大沉降向下沉隧道侧偏移,另一侧的沉降量则相对较小;土体损失率对管线的沉降有较大影响,而管线埋深对管线沉降的影响则相对较小。

Calculation of Pipeline Settlement Induced by Double-O-Tube Shield Tunneling Based on Energy Method

The relative position coefficient of tunnel and excavation surface, α, is introduced to make the derived equation applicable to various tunnelling face convergence modes. Based on the calculation formula of soil settlement, the energy variational control equation is established, and the calculation method of underground pipeline settlement induced by DOT shield tunneling is derived. The distribution of the pipeline settlement under four typical operating conditions is compared and analyzed, and the correctness of the results is verified. Meanwhile, the influence of buried depth and soil loss rate on the settlement of pipeline is analyzed. The results show that the settlement curve of the pipeline under three kinds of normal conditions satisfies the normal distribution, and the pipeline settlement is not uniform under the rotation condition, the maximum settlement of the pipeline is shifted to the subsidence tunnel while the settlement on the other side is relatively low. The soil loss rate has a significant impact on the pipeline settlement, while the buried depth of pipeline has little impact.