破碎岩体上混凝土重力拱坝的设计要点分析

由于巴基斯坦高摩赞大坝坝址地质条件复杂,岩体破碎,天然条件下不满足修建混凝土坝的地基条件。以现场勘查和试验为基础,采用大范围大深度的固结灌浆处理方案。结合生产性灌浆试验,采用声波测试结合承压板载荷试验,验证固结灌浆对提高坝基变形模量的效果,并采用固结灌浆处理后的岩体物理力学参数对大坝进行了有限元分析。在多方论证的基础上,经过对大坝体型和结构的精心设计,在十分破碎的岩体条件下,成功建成了133 m高的混凝土重力拱坝。研究成果为国外混凝土重力拱坝的设计提供参考。

Analysis on main design points of concrete gravity arch dam on fractured rock mass

Due to the complicated geological condition with fractured rock mass，the virgin condition of the site of Gomal Zam Dam in Pakistan cannot meet the foundation condition required for constructing a concrete dam. Based on the in situ investigation and experiment，the treatment scheme of large range and depth consolidation grouting is then adopted. Combined with grouting experiment，the effect iveness of the consolidation grouting on enhancing the deformation modulus is verified，while a finite element analysis is made on the dam body with the rock physical and mechanic parameters after the treatment of consolidation grouting as well. On the basis of the demonstrations made in several aspects，the concrete gravity arch dam with the height of 133m is successfully built up under the condition of intensively fractured rock mass through an elaborative design concerned. The study result can provide references for design of the concrete gravity arch dams.