地温对冻土动力特性及其场地地震动参数的影响  

The Influence of Earth Temperature on Dynamic Characteristics of Frozen Soil and the Parameters of Ground Motion on the Sites of Frozen Soil

作　　者：王兰民[1] 张冬丽[1,2] 吴志坚[1,3] 马巍[3] 

机构地区：[1]中国地震局兰州地震研究所,中国地震局黄土地震工程开放实验室,兰州730000 [2]中国地震局工程力学研究所,哈尔滨150083 [3]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《中国地震》2003年第3期195-205,共11页Earthquake Research in China

基　　金：地震科学联合基金项目 (10 0 134);中国地震局昆仑山口西 8 1级地震科学考察项目;中国科学院知识创新工程重大项目 (KZCX1-SW - 0 4 );"973"国家重点基础研究发展规划项目 (2 0 0 2CB4 12 70 4 )

摘　　要：地温是影响冻土力学性质的重要参数之一。本文基于对 2 0 0 1年 11月 14日昆仑山口西 8 1级大震在多年冻土区所造成的地表变形与地震破坏特征的定量调查结果 ,通过冻土的振动三轴实验 ,研究了地温对冻土动本构关系、动弹性模量、阻尼比、动强度等动力特性参数的定量影响规律 ;进而利用青藏铁路沿线 4个冻土剖面和该区 5 0年超越概率分别为 6 3%、10 %和2 %的场地基岩地震动时程 ,分析计算了不同地温下冻土场地地震动参数的特征 ,研究了地温对冻土地面地震位移、速度、加速度和反应谱等的定量影响 ,为冻土区工程地基、路基以及地下工程震害防御提供了科学依据。Earth temperature is one of the most important factors of influencing the mechanical property of frozen soil. Based on the field investigation to the characteristics of ground deformation and ground failure caused by the west of Kunlun mountain pass M8.1 earthquake, the influence of temperature on dynamic constitutive relationship, dynamic elastic modulus, damping ratio and dynamic strength of frozen soil were quantitatively studied by means of dynamic triaxial test. Moreover, the characteristics of ground motion on frozen soil site under different temperatures were analyzed for the four profiles of frozen soil along the Qingzang Railway using the time histories of ground motion acceleration with 3 exceedance probabilities of the Kunlun mountain area. The influences of temperature on seismic displacement, velocity, acceleration and response spectrum on frozen ground were quantitatively studied. A scientific basis was presented for earthquake disaster mitigation of grounds of structures and highways and underground engineering in the frozen soil areas.

关 键 词：冻土 地温 动力特性 地震动参数 

分 类 号：P314[天文地球—固体地球物理学]