利用重力非跨越式探测城市地下空间方法研究

Research on method of non-spanning detection of urban underground space by gravity

近年来,私挖乱建地下室扩大住宅面积现象日益普遍,严重威胁城市内各类建筑以及地下基础设施的安全。因此,探测地下空间破坏现状是亟需深入开展的工作。基于地下空洞会在一定范围内引起重力异常这一原理,利用CG-5重力仪在2个有代表性的区域进行实验。采用重力非跨越式探测方法,对目标地下空间进行微重力测量。依据测量数据和图像,判断出地下空间位置、边界和规模,由此验证利用重力仪在城市地下空间外侧一定距离内探测地下空间的可行性。

In recent years,the phenomenon of illegally digging basements to expand residential space has become increasingly common,which seriously threatens the safety of various buildings and underground infrastructures in cities.Therefore,it is urgent to explore the present situation of underground space destruction.Based on the principle that underground cavities can cause gravity anomalies in a certain range,experiments are carried out in two representative areas using CG-5 gravimeter.The gravity non-spanning detection method is adopted to measure the microgravity of the underground space.According to the measured data and images,the position,boundary and scale of the underground space are judged,thus verifying the feasibility of using gravimeter to detect the underground space within a certain distance away from the target urban underground space.