冻土三轴试验温度精准测控新方法  

Accurate measurement and control of temperature in thetriaxial test for frozen soil

作　　者：孙义强 孟上九[1,2,3] 王淼 穆海龙 SUN Yiqiang;MENG Shangjiu;WANG Miao;MU Hailong(Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;College of Civil Engineering and Architecture,Harbin University of Science and Technology,Harbin 150080,China;College of Architecture and Civil Engineering,Jiamusi University,Jiamusi 154007,China)

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080 [2]哈尔滨理工大学建筑工程学院,黑龙江哈尔滨150080 [3]佳木斯大学建筑工程学院,黑龙江佳木斯154007

出　　处：《自然灾害学报》2020年第6期21-29,共9页Journal of Natural Disasters

基　　金：黑龙江省自然科学基金项目(ZD2019E009);国家自然科学基金项目(51378164);中国地震局工程力学研究所基本科研业务费专项项目(2019D16)。

摘　　要：冻土力学理论与冻土区工程建设的开展依赖于大量的室内外试验,试样温度测控是否精准决定了试验成败及可靠性。现有冻土三轴试验以低温箱或压力室温度作为试样温度,对比试验表明,低温箱及压力室温度与试样本身温度相差较大,存在空间上的不均衡性及时间上的滞后性,并将直接导致试验结果失准。针对该问题,本文研制了一套三轴试验温度精准测控方法及设备。基于低功耗蓝牙传感技术,研制了小型无线温度传感器,并配套设计完成了手机端APP,可对试验过程中土试样内部温度进行实时监测;通过三轴仪底座及压力室内有线温度测试系统,实现土试样表面温度及环境温度的实时监测;通过在压力室内设置降温室,利用水浴降温实现了土试样的快速冻结和温度稳定控制。此套方法及设备实现了冻土三轴试验试样温度的空间无盲点、时间无滞后精准测控。The theory of frozen soil mechanics and the engineering construction in frozen soil regions depend on extensive laboratory and in situ tests.The accuracy of specimen temperature measurement and control determines the success or failure and reliability of tests.Existing triaxial tests conducted on frozen soil use the temperature of the low-temperature apparatus or pressure chamber as the sample temperature.Comparative tests showed quite different temperatures,and there was inhomogeneity in space and lag in time for specimen temperature,which would directly lead to inaccurate results.A set of precise temperature measurement and control methods and devices for the triaxial test were developed in this study to solve this problem.A low power bluetooth-based small wireless temperature sensor was developed,and the matching mobile phone APP was designed,aiming to monitor the sample internal temperature during the test in real-time.The sample surface temperature and the ambient temperature were measured in real-time via the wired testing system implanted in the base of the sample and the pressure chamber.A cooling chamber was installed in the pressure chamber,and the rapid freezing and stable temperature control of soil samples were realized by water bath cooling.This set of methods and devices realize the accurate sample temperature measurement and control in the frozen soil triaxial test without a blind spot in space and delay in time.

关 键 词：冻土 三轴试验 温度 精准测控 

分 类 号：TU415[建筑科学—岩土工程] TH873[建筑科学—土工工程]