岩溶区桩基沉降的影响探讨

Discussion on Influence of Pile Foundation Settlement in Karst Area

岩溶区地质情况错综复杂,而目前针对岩溶区溶洞空间几何尺寸变化对桩基沉降影响的研究较少。以武汉智能联网汽车封闭测试场桩基项目为研究背景,采用Midas GTS有限元软件建立三维模型,通过控制变量的方法,逐一探究溶洞至桩尖距离的改变,溶洞形状和体积改变对桩基沉降的影响规律。对计算结果进行归纳分析,得出的结论为:当洞顶至桩尖的厚跨比小于0.4时,桩基沉降现象较为明显;单一溶洞形状与体积的变化对桩基沉降影响较小。

The geological situation in Karst area is complex,but there are limited studies on the influence of the spatial geometric size change of Karst cave on the settlement of pile foundation in karst area.Taking the pile foundation project of Wuhan intelligent networking automobile closed test site as the research background,the three-dimensional model is established by using Midas GTS finite element software.By method of controlling variables,the change of the distance from the Karst cave to the pile tip and the influence law of the change of Karst cave shape and volume on the settlement of pile foundation are explored one by one.The calculation results are summarized and analyzed.The conclusions are as follows:when the thickness span ratio from the tunnel top to the pile tip is less than 0.4,the settlement of pile foundation is more obvious.The change of the shape and volume of a single Karst cave has little effect on the settlement of pile foundation.