论文部分内容阅读
火山熔岩空洞给海屯高速公路的修建带来新问题,应对其开展相应的试验及数值分析。通过现场静载荷试验,测得了熔岩空洞地基的P-s曲线及其变形模量。然后以某路段火山熔岩空洞地基为例,建立相应的数值分析模型,探讨了火山熔岩空洞地基的极限承载力与形状系数及厚跨比之间的关系。结果表明:随顶板厚度的增加,空洞地基的极限承载力逐渐增大;火山熔岩空洞的形状越扁平,其极限承载力越小,空洞越趋近于圆形,其极限承载力就越高;形状系数对火山熔岩空洞地基极限承载力的影响为主导因素,厚跨比为从属因素。
Volcanic lava hole to the construction of the highway brought new problems Tuen, should carry out the corresponding test and numerical analysis. P-s curve and deformation modulus of lava cavity are measured by on-site static load test. Then taking the volcanic lava hollow foundation of a section as an example, a corresponding numerical analysis model is established to discuss the relationship between the ultimate bearing capacity of volcanic lava hollow foundation and the shape factor and thickness-span ratio. The results show that the ultimate bearing capacity of the hollow foundation increases with the increase of the thickness of the roof; the shape of the volcanic lava cavity is flatter, its ultimate bearing capacity is smaller and the cavity is closer to the circle, the ultimate bearing capacity is higher; The influence of form factor on the ultimate bearing capacity of volcanic lava cavity is the dominant factor, and the thickness to span ratio is the dependent factor.