深开挖对周围工程设施的影响预测

Prediction to the Influence of Deep Excavation on Surrounding Facilities

研究了以非线性应力应变关系，根据Ｂｏｉｔ固结理论用有限元方法预测由于深开挖引起周围的地层位移对地下工程设施的影响问题，分析了地层水平位移和地层沉降的分布特性，表明有限元方法可以方便地用于预测深开挖的影响范围，算例的数值结果说明，对于地下管线等地下工程设施，由开挖产生的地层水平位移的影响往往会大于地层沉降。

In this paper, a finite element methods for predicting the influence of soil movement due to deep excavation on surrounding underground engineering facilities is developed based on Biot's consolidation theory in which nonlinear stress-strain model is adopted. The distribution characteristics of horizontal and vertical movements inside the soil deposit are analyzed by a numerical example. It is indicated that the influence range of the horizontal movement in soil is larger than that of the vertical movement,therefore the influence of the horizontal movement should not be neglected. It is also shown that the proposed approach can be used to predict the influence range of the movement effectively.