基于三维网格模型重构的岩溶地质构造稳定性数值分析

Numerical analysis of karst geological structure stability based on 3D mesh model reconstruction

由于岩溶地质的离散性大,传统建模方法并不能真实反映其空间分布状态,数值分析结果的可靠性受到限制。为精确分析无锡市某超高层项目基础落位区岩溶地质构造稳定性,本文基于三维网格模型重构技术,建立该区域岩溶地质构造的三维有限元分析模型,分别分析了溶洞处治前及注浆加固后的稳定性,结果表明:溶洞未处治时,溶洞周边岩体应力较大且存在应力集中,不均匀沉降现象明显。对溶洞进行注浆加固处治后,溶洞周边岩体应力集中现象减弱,模型顶面最大沉降量下降了54.55%,不均匀沉降趋势大大减小。通过上述分析,不仅对该超高层项目基础的设计和溶洞的处治具有重要指导意义,也为类似工程的数值分析提供参考。

Because of the large discreteness of unfavorable geology,the traditional modeling method cannot truly reflect its spatial distribution,the reliability of the numerical analysis is limited.In order to accurately analyze the stability of karst geological structure in the foundation area of a super-high-rise project in Wuxi,a 3D finite analysis model of karst geological structure is established based on 3D mesh model reconstruction technology,and the stability of karst cave is analyzed before and after grouting reinforcement.The results show that when the cave is not treated,the rock mass around the cave has large stress concentration and obvious non-uniform settlement.After the grouting reinforcement,the stress concentration of rock mass around karst cave is weakened,the maximum settlement on top of the model is reduced by 54.55%,and the non-uniform settlement trend is greatly reduced.The above analysis not only has an important guid⁃ing significance for the foundation design of the super-high-rise project and the treatment of karst caves,but also pro⁃vides a reference for the numerical analysis of similar projects.