摘要
基于Midas GTS NX有限元软件选用修正摩尔-库伦模型(MMC模型),对昆明市某医院基坑工程进行模拟计算,结合实际监测数据对比分析验证模型的可靠性。然后对支护结构进行优化分析,并在后续施工中进行了验证。结果表明:(1)数值模拟结果与监测结果变化规律基本一致,说明采用数值模拟方法对基坑开挖进行分析是可行的;(2)通过改变模型中锚索倾角、长度及预加力等因素,提出了锚索的优化设计方案为锚索倾角20°,第一层锚索长度21 m、预应力190 kN,第二层锚索长度23 m、预应力210 kN,第四层锚索长度18 m;(3)根据优化设计方案,在基坑现场进行实际施工,最后根据实际监测数据发现,支护桩顶水平位移降低9.4%、竖向位移降低8.6%,验证了优化设计方案的合理性。
Based on the Midas GTS NX finite element software,a modified Mohr Coulomb model(MMC model) was selected to simulated calculation of a foundation pit project in a hospital in Kunming.The reliability of the model was verified through comparative analysis of actual monitoring data.Then,the support structure was optimized and analyzed,and verified in subsequent construction.The results indicate that:(1) the variation patterns of numerical simulation results and monitoring results are basically consistent,indicating that using numerical simulation methods to analyze foundation pit excavation is feasible;(2) By changing the factors such as the inclination angle,length,and pre applied force of the anchor cable in the model,an optimized design plan for the anchor cable is proposed as follows:the inclination angle of the anchor cable is 20°,the length of the first layer of anchor cable is 21 m,the pre-stress is 190 kN,the length of the second layer of anchor cable is 23 m,the pre-stress is 210 kN,and the length of the fourth layer of anchor cable is 18 m;(3) According to the optimized design scheme in this article,actual construction was carried out on the foundation pit site.Finally,based on actual monitoring data,it was found that the horizontal displacement of the support pile top decreased by 9.4% and the vertical displacement decreased by8.6%,verifying the rationality of the optimized design scheme.
作者
龙治强
欧明喜
李强
张鹏
LONG Zhiqiang;OU Mingxi;LI Qiang;ZHANG Peng(Shanghai Tunnel Engineering Corporation,Shanghai 200232,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)
出处
《广东土木与建筑》
2024年第3期23-27,52,共6页
Guangdong Architecture Civil Engineering
基金
国家自然科学基金项目(51968036)。
关键词
MIDAS
数值模拟
变形分析
优化设计
Midas
numerical simulation
deformation analysis
optimal design
作者简介
龙治强(1989-),男,本科学士,工程师,主要从事施工技术与管理方面的研究。E-mail:2323201218@qq.com;通讯作者:张鹏(1998-),男,硕士,主要从事岩土与地下工程研究。E-mail:474109930@qq.com。
