关于深基坑开挖防护措施的研究  

Study of protective measures on deep excavation in construction

作　　者：范加冬[1] 张令刚[1] 张金科[1] 

机构地区：[1]中国矿业大学建筑工程学院土木工程系,江苏徐州221006

出　　处：《四川建筑科学研究》2011年第5期123-126,184,共5页Sichuan Building Science

摘　　要：鉴于深基坑开挖危险程度大,且目前防护措施完善程度不够,通过对实际问题的简化分析,利用变形协调关系及第四强度理论,结合弹性条件下饱和土体的力学特性,通过9颗粒单元体模型,研究并确定了深基坑开挖的最危险位置;通过对基坑最危险位置施加预压力,研究了预压力对基坑弯矩和剪应力分布的影响。研究表明,增设预压力,可以显著改善基坑受力状态,使其弯矩及剪力高峰趋于平缓,显著增加施工的安全性。In the view of the high risks in excavating deep foundation and protective measures to improve the current situation is not enough,the practical problems are simplified and with the use of relationship between deformation and fourth strength theory,and flexibility in saturated soil under the conditions of the mechanical properties is combined,so the deep foundation＇s most dangerous position is identified.Studying the pre-imposed pressure on the most dangerous position,then the distribution of bending moment and shear stress is clear.Studies have shown that additional pre-pressure can significantly improve the stress and its bending moment and shear tend to the moderate peak,which also make the construction＇s safety a significant improvement.

关 键 词：变形协调关系 第四强度理论 最危险位置 预压力 弯矩和剪应力的分布 

分 类 号：TU462[建筑科学—结构工程]