东黄山国际小镇岩溶发育危险性评价

岩溶作为工程建设中常见的地质灾害之一,对岩溶区工程的设计和施工具有一定的威胁。根据东黄山国际小镇的勘察成果,揭露岩溶多以覆盖性串珠状溶洞为主,主要沿麻川河及其支流呈条带状分布。在总结岩溶发育特征的基础上,充分考虑了研究区影响岩溶发育的控制因素,选取地层岩性、钻孔遇洞率、覆盖层厚度、土层结构、地下水水位埋深、距地表河流的距离6个主控因素,应用地理信息系统技术(geographic information system,GIS)和层次分析法(analytic hierarchy process,AHP)多源信息相融合的方法,构建了东黄山国际小镇岩溶发育危险性评价模型,并对研究区进行了预测分区评价。结果表明:岩溶高发育区主要集中在小镇中部和北部,面积约0.4 km~2,约占研究区总面积的5%。根据钻孔揭露情况,揭露溶洞的11个钻孔均位于评价分区图中的危险区,拟合程度高,表明构建的岩溶发育危险性评价分区模型与实际相符。研究成果对东黄山国际小镇基础设施的规划和建设具有一定的指导作用。

Risk Assessment of Karst Development in Donghuangshan International Town

Karst is one of the common geological disaster in engineering construction, which threatens the design and construction of Karst area engineering. According to the results of the Donghuangshan international town, it is revealed that the main Karst is covered bead-like karst cave, which is mainly distributed along the Machuan River and its tributaries in a strip. On the basis of summarizing the characteristics of Karst development in the study area, the controlling factors of karst development are fully considered in this paper, selection of six influencing factors : formation lithology, borehole hole rate, thickness of overburen, soil structure, depth of ground water level, distance from the surface river, the risk assessment model of karst development in Donghuangshan international town is constructed by the method of fusion of GIS and AHP. The area of research is predicted and evaluated. The results show that the karst high development area is mainly concentrated in the middle and the north part of the town, and the area is about 0.4 km², which is about 5% of the total area of the study area. According to the situation of borehole exposure, 11 boreholes of karst cave are located in the dangerous area in the Evaluation partition map, and the degree of fit is highly, which indicates that the karst development risk assessment model constructed is consistent with the reality. The research results have certain guiding significance for the planning and construction of the infrastructure of Donghuangshan international town.