岩溶发育区薄-中厚层碳酸盐岩人工骨料场勘察——以皂市水利枢纽为例

Investigation on artificial aggregate fields of thin-medium-thick carbonate rocks in karst development area in Zaoshi Hydropower Project

皂市水利枢纽天然建筑材料选用易家坡料场嘉陵江组薄-中厚层白云质灰岩,浅表部岩溶发育,岩体薄层状构造以及可能的溶蚀夹泥会对料场质量产生影响,这些不利因素给料场分区、选择利用等造成了很大困难。通过对易家坡料场进行综合勘察和分析,以岩溶发育程度为主要标准,综合考虑顺层填泥情况、岩体风化状况、岩石单层厚度以及地形等因素,对料场进行了质量分区,最终选择以Ⅰ区、Ⅱ区为主的适宜开采区域,工程实践表明料场储量满足设计要求。相关经验可供类似工程料场勘察比选工作借鉴。

The natural building materials of Zaoshi Hydropower Project are the thin-medium-thick dolomitic limestone of Jialingjiang Formation in Yijiapo material field.The developed surface karst,thin-layer structure of rock mass and the possible dissolution of mud would affect the material field quality.These unfavorable factors brought about great difficulties in the zoning,selection and utilization of the material field.Based on the comprehensive investigation and analysis on the Yijiapo material field,taking the karst development degree as the main criteria,and considering the factors such as bedding mud filling,rock weathering,single layer thickness of rock and terrain,the quality partition of the material field was carried out.Finally,Area I and Area II were selected as the suitable mining areas.The engineering practice showed that the material field reserves met the design requirements.Relevant experience can be used as reference in the comparison and selection of material field investigation for similar projects.