摘要
寒区工程动荷载模型试验系统主要由模型试验槽、制冷及控温装置、动力加载装置、传感器和数据采集系统四部分组成．系统具有如下特点：能根据实际工程对长3m、宽2．5rn和高1m的模型试验土体进行低温动荷载试验；采用3组冷冻板给土体降温，降温速度快，能提供的最低温度为-20℃，而且能提供多组均匀、稳定的温度边界，冷冻板的温度波动度≤±0．2℃，温度均匀度≤±0．3℃；可施加多种频率、多种波形的动力荷载，频率范围为0．1～10Hz，加载波形为正弦波、矩形波、三角波以及用户自定义波形．另外，系统能提供的最大载荷为100kN，而且作动器行程较大，为±75mm，适合多种尺寸的模型土体．试验时，先装样并布设各类传感器，然后对土体降温，温度达到要求后施加动力荷载，最后通过传感器和数据采集系统获得土体的应力、变形及温度变化数据．
The model test engineering with dynamic this paper. This system system for cold regions loading is introduced in consists of model test tank, refrigeration system and temperature controller, dynamic loading system, sensors and date collectors, of which the features are presented as follows. The maximum length, width and height of model test specimen are 3 m, 2.5 m and lm, respectively. Three groups of freezing plate are used to lower the temperature of model specimen, so the cooling rate is fast. The lowest temperature provided by refrigeration system is -20 ℃. The temperature fluctuation and uniformity of freezing plate are less than±0.2 ℃ and ±0.3 ℃, respec-tively. The maximum load provided by dynamic loading system is 100 kN and the maximum move distance of actuator is ＋75 mm. The vibration frequency of dynamic load can change in the range of 0.1-10 Hz. Several kinds of waveform, such as sine wave, rectangular wave, triangle wave and other waves defined by user, can be produced by controller of dynamic loading system. To perform a model test, first, put specimen into the model test tank, secondly, lower the temperature of model specimen, thirdly, press dynamic load on the specimen, finally, collect data of stress, deformation and temperature change by sensors and date-collectors.
出处
《冰川冻土》
CSCD
北大核心
2011年第4期826-832,共7页
Journal of Glaciology and Geocryology
基金
中国科学院西部行动计划(二期)项目(KZCX2-XB2-10)
中国科学院"西部之光"重点项目"列车荷载作用下青藏铁路冻土路基的动力响应特性研究"资助
国家自然科学基金项目(40971046
40901039)
关键词
寒区工程
动荷载
模型试验系统
应力
变形
温度变化
cold regions engineering
dynamic loading
model test system
stress
deformation
temperature change
