摘要
滑坡灾害发生前夕,滑体内的局部岩土体发生爆裂、摩擦和断裂等破坏会产生次声波向外传播,基于次声信号的超前定位成为滑坡监测预警的关键技术。将波动方程通过傅里叶变换到亥姆霍兹方程,利用汉克尔变换得到波动方程的核函数,建立了基于简正波的地质声场模型,仿真分析了土层与空气、土层与岩层之间反射折射关系;提出滑坡次声信号的简正波模型匹配场超前定位算法,将垂直接收阵的测量次声信号与传播模型的拷贝次声信号进行相关匹配计算,搜索计算得到模糊函数最大值处的坐标定位为声源点,并采用12元垂直接收阵仿真分析3种匹配场算法性能,发现可变系数似然匹配场算法具有旁瓣小、定位准确的优点,可应用于滑坡定位技术;将垂直接收阵置于空气层中、土层中不同位置发现,土层中的垂直阵能够精确定位,而空气中误差较大;并将该算法应用于滑坡超前定位,定位了滑体的局部破坏位置和预测滑移线。该算法为滑坡超前定位技术提供了新的思路。
On the eve of the landslide disaster, bursting, friction and fracture of rock and soil mass in the sliding body will cause low frequency infrasound signals to propagate outward. Advance positioning based on infrasound signals has become a key technology for landslide monitoring and early warning. In this paper, the wave equation was transformed into Helmholtz equation by Fourier transform, and the Kernel function of the wave equation was obtained by Hankel transform. Based on this, we established the normal wave geological sound field model, and simulated the reflection-refraction relationship between the air, soil and rock interface. By matching the measured infrasound signals of the vertical receiving array with the copied infrasound signals of the propagation model, we proposed the advanced matching field location algorithm for infrasound signals of landslide, which searches for the coordinates at the maximum correlation coefficient as the predicted sound source. We compared the performance of three matching field algorithms and found that the variable-coefficient-likelihood matching field algorithm can be applied to landslide positioning technology due to its small sidelobe and accurate positioning, and found that the 12-element vertical array in the soil layer could be accurately positioned, but the error in the air was large. Finally, we applied the algorithm to the advanced positioning of landslides, and obtained the local failure position and predicted the slip line of landslide. This algorithm provides a new idea for the landslide advanced prediction and positioning technology.
作者
赵久彬
刘元雪
杨骏堂
柏准
ZHAO Jiu-bin;LIU Yuan-xue;YANG Jun-tang;BAI Zhun(Department of Military Installations,Army Logistics University of PLA,Chongqing 401311,China;Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection,Army Logistics University of PLA,Chongqing 401311,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第12期4116-4126,共11页
Rock and Soil Mechanics
基金
国家自然科学基金(No.41877219)
重庆市自然科学基金(No.cstc2019jcyj-msxmX0585)
重庆市规划和自然资源局科技计划项目(No.KJ-2018016)。
关键词
滑坡超前定位
次声信号
简正波模型
匹配场
advanced positioning of landslides
infrasound signal
normal wave model
matching field process
