SHTB experiment study of CRLD bolt under the monitoring by laser displacement sensor
GONG Weili1，2，ZHANG Zixiang1，2，GAO Xia1，2，HE Manchao1，2，SUN Yaxing1，2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China；2 School of Mechanics，Architecture and Civil Engineering，China University of Mining and Technology，Beijing 100083，China)
The constant resistance and large deformation bolt(CRLD bolt) which working resistance is 130 kN and has widely been used as rock support in longwall mining based on gob-side entry retaining without coal pillar(110 mining method) was selected as the sample. In order to investigate it′s dynamic response characteristics，the SHTB tests were carried out on the modified SHTB system which modified by HE Manchao. In the test，quartz piezoelectric force sensor and laser displacement sensor were used to monitor the impact force and impact displacement response of the CRLD bolt at different impact speeds. The test results show that，under the impact load，the impact force and the elongation speed of the bolt both reach the peaks within 0.5 ms，and the CRLD bolt can respond rapidly to the impact. Under different impact velocities，the impact force and deformation velocity of CRLD bolt are both a fluctuation which going through a time developing process. The deformation of large deformation bolt with constant resistance is a process of elastic-slip-elastic recovery.
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2018, Vol. 37 
