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| Research on the Long - term Monitoring Technology of Subgrade Settlement for High - speed Railway in Operation Period |
| WANG Xiang，WANG Bo, WANG Zheng -xing |
| (China Railway Bridge Science Research Institute Ltd，Wuhan，Hubei 430034，China) |
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Abstract Abstract ： Research purposes ： High - speed railway pases all kinds of complex geological structure and transition sections frequently in our country. Moreover， climate in one line is a important factor it must to face. So a reliable monitoring technology must be supplied for high - speed railway maintenanc in order to ensure security. Research conclusions:(1) The vertical displacement sensor by air pressure difference with precision 0. 1 mm could meet the requirements of long - term monitoring for engineering stucture after compensating the system error from temperature and gravitational acceleration. (2) Its date drifting by time and temperature in the range of ±0. 5 mm have been proved by corresponding experiments， which also confirmed the sensor could work normally under - 20 ℃. (3 ) Automatic continuous long - term monitoring of subgrade settlement for high - speed railway in operation period using the vertical displacement monitoring system by air pressure difference with solar power and internet of things was conducted in some experimental section， which can satisfy the requirement of high - speed railway in the accuracy， stability and safety. Other high - speed railway can also use the technology.
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Received: 22 February 2017
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2017, Vol. 34 
