场分布参数的声波层析成像反演  

INVERSION OF FIELD DISTRIBUTION PARAMETERS BYACOUSTIC TOMOGRAPHY

作　　者：宋雷[1] 黄家会[1] 杨维好[1] 王衍森[1] 杨芷江[1] 陈先德[1] 

机构地区：[1]中国矿业大学建筑工程学院,江苏徐州221008

出　　处：《岩石力学与工程学报》2005年第9期1577-1581,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：交通部西部交通建设科技项目(2002 31800018)

摘　　要：温度场、渗流场和应力场等参数的检测是岩土工程领域中重要课题,利用场参数与声学参数的对应关系,通过声波层析成像技术可获取工程体内部的场分布特征。将描述物理场分布特征的偏微分方程转化为平滑算子,实现了物理场分布规律对层析成像反演过程的约束,提高了反演解释的精度。最后,通过数值模拟,说明了该方法的特点。Field distribution parameters (FDP), such as temperature, seepage and stress, are important in civil engineering. It is important to obtain the parameters by inversion of field measurement. According to the relationship between the parameters and acoustic velocity, field distribution parameters can be determined by acoustic velocity distribution which can be calculated by acoustic computer tomography (ACT). Considering of the characteristics of filed parameters distribution, smoothing operator (SO) is proposed in SIRT iterative process of ACT. SO is derived from the corresponding partial differential equation that introduces the contribution of adjacent cells into SIRT process and improves the inversion accuracy obviously. At last an example of frozen temperature field inversion is given to illustrate the effectiveness of the method.

关 键 词：岩土工程 场分布参数 层析成像 平滑算子 

分 类 号：P631.5[天文地球—地质矿产勘探]