岩质基坑开挖过程中水平位移特性分析  

ANALYSIS OF HORIZONTAL DISPLACEMENT CHARACTERISTICS DURING ROCK FOUNDATION PIT EXCAVATION

作　　者：闫升飞 齐鲁杰 张拥军[2] YAN Shengfei;QI Lujie;ZHANG Yongjun(China Railway Construction Engineering Group,Beijing 100071,China;School of Civil Engineering,Qingdao University of Technology,Shandong Qingdao 266525,China)

机构地区：[1]中铁建工集团有限公司,北京100071 [2]青岛理工大学土木工程学院,山东青岛266525

出　　处：《低温建筑技术》2024年第8期82-85,100,共5页Low Temperature Architecture Technology

基　　金：青岛市科技惠民示范专项项目(23-2-8-cspz-13-nsh)。

摘　　要：为研究岩质基坑开挖过程中基坑侧壁水平位移的变化特征,文中以山东大学齐鲁医院Ⅱ期项目基坑工程为例,通过数值模拟与现场监测数据相结合的研究方法,对岩质基坑开挖过程中基坑土体与坡顶水平位移变化规律进行分析。研究结果表明,在基坑的开挖过程中,坡顶处岩体较为破碎的强风化花岗岩产生的水平位移较大,微风化花岗岩岩体位移较小;随开挖深度的增加,基坑水平位移影响区域逐渐增大,基坑侧壁相同位置的水平位移也随之增大,近似为“中间大,两端小”的分布规律;坡顶水平位移的模拟值与监测值变化规律一致,证明研究的可靠性。研究结果可为类似工程提供借鉴作用。This paper studies the change characteristics of the horizontal displacement of the side wall of the founda⁃tion pit in the excavation process of rocky foundation pit.Taking a foundation pit project as the case,we analyze the change rule of the horizontal displacement law between the soil body of the foundation pit and the top of the slope in the excavation process of the rocky foundation pit through the combination of numerical simulation and on-site moni⁃toring data.The results show that the horizontal displacement of the strongly weaved granite rock mass at the top of the slope is large,and the displacement of the lightly weaved granite rock mass is small.With the increase of excava⁃tion depth,the influence area of the horizontal displacement of the foundation pit gradually increases,and the hori⁃zontal displacement of the same position of the side wall of the foundation pit also increases,which is approximately the distribution law of large displacement in the middle and small displacement at both ends.The simulation results of the horizontal displacement of the slope top is consistent with the experimental results,proving the reliability of the study.

关 键 词：岩质基坑 坡顶位移 桩锚支护 变形规律 

分 类 号：TU471.6[建筑科学—结构工程]