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在有限元分析的基础上,采用Drucker-Prager弹塑性模型对黄土层中地下连续墙的沉降特性进行了较详细的探讨。计算结果表明:墙端阻力的大小决定了土体的竖向沉降变形,墙端以下土体的竖向沉降变形主要产生在墙端下约1.5倍基础宽的深度范围内,且沉降量随着深度的增加而迅速减小;竖向荷载作用下墙芯土体竖向沉降变形值在墙顶附近最大,沿深度方向逐渐变小,在墙端附近其值变化速率最大,墙端以下土体沉降迅速衰减为零;墙外侧土体竖向变形沿深度先增加,由于端阻力的的作用,在墙端附近达到极值,然后减小并趋于零;在水平面上,竖向变形从墙侧向外逐渐减小并趋于零,在墙体接触面附近其值最大;墙周土体的变形模量对基础沉降的影响大,而土体的泊松比对基础沉降的影响较小,提高墙土接触面的摩擦系数有利于减小基础沉降。
Based on the finite element analysis, the settlement characteristics of the diaphragm wall in the loess layer are discussed in detail by using the Drucker-Prager elastoplastic model. The calculation results show that the resistance of the wall end determines the vertical settlement of the soil, and the vertical settlement of the soil below the wall end mainly occurs in the depth of about 1.5 times of the base width under the wall, The vertical settlement of wall core soil under vertical load is the largest in the vicinity of the top of the wall and gradually decreases in the depth direction, and its maximum value changes near the wall end. The soil below the wall end Settlement rapidly decay to zero; vertical deformation of the soil outside the wall along the depth of the first increase, due to the end of the resistance effect, near the wall ends reach the extreme, and then decrease and tends to zero; in the horizontal plane, the vertical deformation from the wall The value of the soil around the wall contact surface is the largest; the deformation modulus of the wall around the soil has a greater impact on the foundation settlement, while the soil Poisson’s ratio has less influence on the foundation settlement , Increase the friction coefficient of the wall-soil contact surface is conducive to reducing the foundation settlement.