软土地区电缆沟通道开挖回弹变形特性研究

Rebound Deformation Characteristics of Cable Channel Excavation in Soft Soil Area

开挖后的电缆沟通道是一个狭长的基坑,苏州某软土地区电缆沟通道的坑底回弹变形量大进而导致工程工后沉降不满足要求。为探究基坑回弹的变形规律,采用ABAQUS软件对电缆沟通道坑底的回弹变形进行了模拟,重点分析了地基土的黏聚力、内摩擦角、弹性模量以及支护结构嵌固深度和基坑开挖两侧超载对坑底土回弹变形的影响。结果表明,地基土的性质对坑底回弹量影响很大,基坑回弹量随土的内摩擦角、黏聚力和弹性模量的减小而增大,尤其是当地基土性质较差(力学参数较小)时,回弹量变化显著;当坑底土性较差时,基坑周边超载对坑底土体回弹量影响较大;坑底回弹量随支护结构嵌固深度的增大而减小,可通过加大支护结构嵌固深度的方法降低坑底回弹量。

The cable channel is always a long and narrow excavation, and the large rebound deformation of the cable channel bottom in soft soil area in Suzhou results in the unmet settlement requirements. In order to explore the deformation rule of excavation rebound. The rebound deformation characteristics after cable channel excavation are simulated by ABAQUS, and the effort is focused on the effects of soil properties such as internal friction angle, cohesion and elastic modulus, embedded depth of supporting structures and overloading on both sides around the excavation. The results show that the soil properties have great influence on the excavation rebound, and the rebound of excavation increases with the decrease of internal friction angle, cohesion and elastic modulus, especially when soil property is poor(mechanical parameters are small). The impact of overloading around the excavation is great when the soil property is poor. The rebound deformation decreases with the increase of the embedded depth of the supporting structures, and it can be reduced by increasing the embedded depth of the supporting structures.