岩溶探测技术在某倒虹管拱座基础中的应用

Application of Karst Detection Technology in an Inverted Siphon Arch Foundation

倒虹管是一种地下输水建筑物或结构物,是指利用倒虹吸原理工作的一种输水管道,作为输水线路上一个重要的水工建筑物,对其拱座基础的地质条件也有较高要求。特别是在岩溶地区,常常会遇到溶洞、溶蚀破碎带等不良地质问题,对水工建筑物的建设带来了极大的安全隐患,因此查明岩溶的发育的位置、规模及影响范围显得尤为重要。地质雷达法和电磁波CT是目前比较成熟的岩溶探测技术,这两种方法都属于电磁类的物探方法,但是都有各自的技术特点,目前在公路、铁路、市政、水利水电工程勘察中都有广泛的应用。结合贵州省最大的水利工程夹岩水利枢纽工程实例,介绍以上两种岩溶探测技术在西溪河倒虹管拱座基础中的综合应用情况,表明通过多种物探手段,可以有效查明地下岩溶的分布形态。

Inverted siphon is an underground water transmission structure, which refers to a water transmission pipeline operated by the principle of inverted siphon. As an important hydraulic structure on water conveyance line, it also has high requirements on geological conditions of its arch foundation. Especially in karst areas, there are often adverse geological problems such as karst caves, dissolution and fracture zones, which bring great potential safety hazards to the construction of hydraulic structures. Therefore, it is particularly important to find out the location, scale and influence range of karst development. Geological radar method and electromagnetic wave CT are relatively mature karst detection techniques at present,both of which belong to electromagnetic geophysical exploration methods. However, each of the two method has its own technical characteristics. At present, they are widely used in highway, railway, municipal, hydraulic and Hydropower Engineering investigation. The comprehensive application of the above two karst detection techniques in the foundation of the inverted siphon arch of Xixi River by combining the largest hydraulic project in Guizhou Province with the example of Jiayan Hydraulic Complex Project. It shows that the distribution pattern of underground karst can be effectively ascertained by various geophysical methods.