动载作用下软弱岩土地质灾害流变动力学研究  

Research on rheologic dynamics for geologic disasters of soft rock-soil under dynamic loading

作　　者：胡华[1] 俞登荣[1] 顾恒星[1] 

机构地区：[1]厦门大学土木工程系,福建厦门361005

出　　处：《自然灾害学报》2007年第4期61-65,共5页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(50678155);福建省自然科学基金资助项目(D0410008)

摘　　要：动态载荷(地震、海啸狂浪、振动等)是导致地质灾害最主要、最直接的外部动力,软弱岩土由缓慢流变演变为加速流变是灾害突发的外在表现形式。分析了我国近几年软弱岩土突发地质灾害的动力因素,探讨了动态流变力学理论方法在研究地质灾害突发机制、灾害监测预报等方面的研究思路与应用前景。测试了软弱岩土在动态载荷作用下的动态流变参数,建立了动态流变力学模型,推导出了新的流变方程。研究结果为进一步探讨突发地质灾害的临界力学条件、流变动力学方程和动力学关键指标等奠定了基础;对揭示动载作用下软弱岩土加速流变导致地质灾害的流变动力学机制,改进和完善灾害监测预报理论,提高预报的科学性和准确性有一定的意义。Dynamic loads such as earthquake, tsunami, raging billow, vibration and so on are mainly exterior power inducing geologic disaster, the accelerating rheologic phenomena of soft rock-soil is the appearance of bursting out disaster. Combining with the practice of soft rock-soil bursting out geologic disaster, the author discusses the technical thinking and prospect by using dynamic rheologic mechanics to study the mechanism and forecast of bursting out disaster in this article. The dynamic rheologic parameters of soft rock-soil are tested under dynamic loading, the dynamic rheologic mechanical model of soft rock-soil is established, and the rheologic equation is deduced. It settles foundation for us to deeply research critical mechanics condition, rheologic dynamic equation and dynamic key index of bursting out disaster. All these have certain theoretical and actual meaning for us to find out the rheologic dynamic mechanism of bursting out disaster under dynamic loading, improve and perfect forecast theory.

关 键 词：流变动力学 动载荷 软弱岩土 地质灾害 

分 类 号：P642.2[天文地球—工程地质学]