基坑开挖中渗流-应力耦合模拟

根据基坑工程施工实际情况，基于地下水渗流的基本规律以及岩土体受力的本构模型，建立了在应力场和渗流场耦合作用下基坑受力的力学模型，通过有限元方法模拟了基坑开挖过程中周围应力场及渗流场的变化规律。计算结果表明：在设置挡土墙并及时排水情况下，随着开挖的进行，基坑周围的土体变形增大，挡土墙前的土体发生沉降，墙体最终发生变形，基坑底部土体向上隆起，在基坑角落处水头梯度较大，发生应力集中，容易导致工程事故，必须谨慎处理。另外，基坑在降水时内外水头差过大将会引起墙体承受过大压力，基坑周围沉降会更大，这样不利于墙体和周围建筑安全。

Numerical simulation of seepage-stress interaction during foundationditch excavation

According to the execution situation of the project, the constitutive model of rock and soil and the seepage law of ground water are taken into account, a new mechanics model of the ditch is established , seepage and the stress field of foundation ditch in different working states are simulated by finite element method. Accordingly, some conclusions are drawn: during the process of excavation, deformation of the soil around the ditch occurs, the soil at the bottom of the ditch swells, at the corner, there exists a stress concentration, this point is a vulnerable area, it should be treated with caution. In addition, with the precipitation of the ditch, the deformation of the rock and soil around the ditch will increase gradually, this will affect the safety of the retaining wall and the building near the ditch, therefore, during the construction of the ditch, precipitation should be controlled cautiously.