基于圆孔扩张理论压密注浆不排水条件下理论计算方法  

Theoretical calculation method under condition of undrained grouting and compaction based on theory of circular hole expansion

作　　者：旷春贵[1] 胡世平 Kuang Chungui;Hu Shiping(Hunan Provincial People′s Hospital,Changsha 410002,China;No.5 Mine,23rd Construction Group Co.,Ltd.,Changsha 410000,China)

机构地区：[1]湖南省人民医院,湖南长沙410002 [2]五矿二十三冶建设集团有限公司,湖南长沙410000

出　　处：《能源与环保》2021年第12期293-297,共5页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：湖南省科技项目(6102012)。

摘　　要：针对目前压密注浆理论未考虑浆液重力和惯性的缺陷,基于宾汉流体的本构方程以及微单元体的受力平衡方程,推导得出了考虑重力条件下土体介质中浆液渗流的速度方程。对于压密注浆,已有的理论仅限于弹性范围,基于圆孔扩张理论,对压密注浆过程中土体塑性区内的应力分布以及扩孔过程中塑性区半径变化和孔壁处的压力变化做了研究,最终计算得出注浆的极限注浆压力。对不排水条件下的柱孔扩张问题分别进行了探讨,同时考虑了超固结比和静止侧压力系数不同带来的影响,展开参数分析。将数值解与解析解对比,发现误差在可接受范围内。Aiming at the defects that the current compaction grouting theory does not consider the gravity and inertia of the slurry,based on the constitutive equation of Bingham fluid and the force balance equation of micro unit,the velocity equation of slurry seepage in soil medium considering gravity was derived.For compaction grouting,the existing theories are limited to the elastic range.Based on the theory of circular hole expansion,this paper analyzed the stress distribution in the plastic zone of the soil during the compaction grouting process,as well as the change in the radius of the plastic zone and the hole wall during the process of hole expansion.The pressure change of the grouting was studied,and the ultimate grouting pressure of grouting was finally calculated.In this paper,the problem of column hole expansion under undrained conditions was discussed separately,and the influence of different over-consolidation ratio and static side pressure coefficient was considered,and the parameter analysis was carried out.Comparing the numerical solution with the analytical solution,it was found that the error is within an acceptable range.

关 键 词：压密注浆 宾汉流体 圆孔扩张 极限注浆压力 

分 类 号：TU472[建筑科学—结构工程]