Data for: Failure Mechanism of Different Types of Shotcrete Based on Modified Weibull Distribution Model

Published: 17 July 2019| Version 1 | DOI: 10.17632/td4kvtsxrh.1
Contributors:
Qiangqiang Zheng,
Yunhai Cheng,
Ying Xu

Description

In this paper, the mechanical properties of three types of shotcrete are studied based on acoustic emission technology. Readers can see the mechanical experimental data and acoustic emission monitoring data of dry-mixed shotcrete, wet-mixed shotcrete and wet-mixed polypropylene fiber shotcrete. In this test, two sets of systems, Rock Mechanics Test System (RMT) developed by Wuhan Institute of Geotechnics, Chinese Academy of Sciences and DS5 series full information AE signal analyzer of Beijing Soft Island Science and Technology are used. RMT experimental system can record and store the stress changes with strain and time in real time. AE monitoring system can track and record the parameters of AE events and the location of the source in real time. In this experiment, eight sensor probes are used to collect the AE signals of samples, which can realize real-time monitoring and three-dimensional positioning of AE signals. The geometric positions of the acquisition points of different AE probes must be the same to reduce the interference of sample size. In order to enhance the monitoring effect of AE, Vaseline was evenly applied on the signal acquisition surface of sensor probe, then pasted on the pre-designed monitoring point and fixed with a rubber band. Before the start of the test, the pencil lead was used as the analog source to detect the degree of its response to the signal source, while eliminating the external impact, friction and other mechanical noise interfered, and the test started after the debugging is normal. During the test, uniaxial loading test and AE monitoring test were carried out simultaneously. The loading system controlled loading by axial displacement with loading rate of 1.2 mm/min and recorded the mechanical test parameters in real time. The AE signal amplifier was set to 40 dB, the threshold of each channel was set to 100 mV, and the sampling frequency was 3 MHz. The AE monitoring system processes and stores the signals monitored by eight sensors, and obtain the red AE source location mark. These data can be used to study the energy changes of three kinds of shotcrete before and after peak stress, and further study the mechanical properties of shotcrete and concrete at different stages of failure. The reliability of meso-experimental results of shotcrete can be verified.

Files