›› 2014, Vol. 35 ›› Issue (3): 901-907.

• Testing Technology • Previous Articles     Next Articles

Design of structure inbuilt displacement measurement system in geomechanical model test and its application

YANG Geng-xin1, 2，MA De-ping3，ZHANG Lin1, 2，CHEN Yuan1, 2，DONG Jian-hua1, 2   

  1. 1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China；2. College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China；3. Chengdu Municipal Engineering Design and Research Institute, Chengdu 610015, China
  • Received:2013-05-06 Online:2014-03-10 Published:2014-03-19

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Abstract: In high arch dam abutment stability geomechanical model test, the relative displacement of weak structural plane is the important reference to determine dam abutment instability and analyze whole dam abutment safety degree. But the current measuring instruments, such as resistance strain gage, surface displacement meter just can measure the strain of dam body and displacement of surface dam abutment; for the relative displacement of weak structural plane which in dam abutment is difficult to obtain. So in light of this problem, based on the resistance strain gage technology, a new type of inbuilt displacement system has been developed and installed on the structural planes to obtain the relative displacement of structure. This system are composed by signal acquisition instrument, Wheatstone bridge and displacement sensor. In model test, strain changing process is got using the inbuilt displacement system; and displacement value is got through the strain-displacement curve. In integral stability geomechanical model test of Jinping high arch dam, installing this system in weak structural plane, the relative displacement is obtained efficiently during the loading process. Comparing with the strain and the abutment surface displacement monitoring results, the feasibility of inbuilt displacement system is proved. The results can provide reliable data to determine the overall stability of the dam and foundation.

Key words: abutment stability of arch dam, geomechanical model, displacement measurement, inbuilt displacement system

CLC Number: 

  • P554
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