摘要
以上海深层隧道调蓄系统中的特深圆形竖井工程为背景,通过土工试验获得深层土的力学参数,然后利用数值模拟获得其土压力分布模式。在此基础上,分析了插入比、挡土墙刚度、竖井直径以及挡土墙厚度对土压力及侧向位移的影响。结果表明:当插入比大于0.18时,增加插入比对圆形竖井的侧移和土压力的影响不显著;弹性模量的降低量小于50%时,圆形竖井侧移略微增大,对开挖面以上的土压力有明显影响;开挖面以下约20 m,土压力值与竖井直径呈非线性负相关,且竖井直径的影响随深度增加而减弱;竖井侧移随着墙厚的增大而减小,但由于边际效应的存在,过度增大厚度对于减少竖井侧移的效果并不显著。
Taking the Shanghai deep tunnel storage project as engineering background, the mechanical parameters of deep soil layers are determined through geotechnical tests, and the earth pressure distribution pattern is obtained by a numerical simulation. On this basis, the influences of the insertion ratio, the stiffness of the retaining wall, the diameter of the shaft and thickness of the retaining wall on the earth pressure and lateral displacement are analyzed, respectively. The results show that when the insertion ratio is greater than 0.18, the increasement of the insertion ratio has no obvious effect on the lateral displacement and the earth pressure. When the elastic modulus is reduced by less than 50%, the lateral displacement increases slightly, which has a significant effect on the earth pressure above the excavation surface. Approximately 20 m below the excavation surface, the earth pressure and the shaft diameter are non-linearly negatively correlated, and the effect of increasing depth is weakened. The lateral displacement of the shaft increases with decrease in the wall thickness. However, it is not necessary to increase the thickness excessively due to the marginal effect.
作者
毛盘
张旭东
叶斌
叶冠林
Mao Pan;Zhang Xudong;Ye Bin;Ye Guanlin(College of Civil Engineering,Tongji University,Shanghai 200092,P.R.China;Beijing Byte Dance Network Technology Company,Beijing 100098,P.R.China;College of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao tong University,Shanghai 200240,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第1期257-267,共11页
Chinese Journal of Underground Space and Engineering
基金
上海市“科技创新行动计划”社会发展领域项目(16DZ1202204)。
关键词
特深圆形竖井
土压力
本构模型
数值模拟
ultra-deep circular shaft
earth pressure
constitutive model
numerical simulation
