静态—准静态加载下含裂隙类岩材料破断试验及声发射特性分析

doi:10.11872/j.issn.1005-2518.2020.06.096

Abstract

Abstract:

In subways，tunnels and other projects，the loading rate effect produced by short-time，high-strength excavation is one of the main factors of engineering disasters. With the widening of demand and the deepening of research，it is of great significance for the safety protection and stability evaluation of rock engineering to carry out studies on the mechanical effects of loading rate and the influence of crack dip angle related to time factors. In order to investigate the fracture law of fractured rock-like materials combined with loading rate and fracture dip angle，RMT-150B rock mechanics testing machine was used to perform static to quasi-static 4-level loading rate uniaxial compression of rock-like materials with 0.1 mm prefabricated cracks.Based on acoustic emission testing technology，the initiation strength law of rock-like materials with preset cracks and the dynamic frequency domain change characteristics of rock mass fractures under the combined action of loading rate and crack dip angle was analyzed. The main research results show that：Under the same loading rate，prefabricated cracks with different dip angles have different degrees of damage to the compressive strength of rock-like specimens，and the peak strength shows a trend of decreasing first and then increasing with the increase of the prefabricated crack dip angle，and the minimum angle is 45°. When the fracture inclination angle is the same，the peak strength of the fracture body increases with the increase of the loading rate. There is a critical loading rate in the quasi-static loading range，so that the loading rate strengthening effect is no longer significant，that is，the growth of the fissure body basically stagnate after reaching a certain value.This critical loading rate is around 2.0×10^-4s^-1.Acoustic emission activity begins to be apparently active after the end of the micro-crack closure phase in the specimen.A large number of micro-cracks initiate and penetrate each other to form macro-cracks.The AE energy rate is most active around the peak.Under the same loading rate，the cracking stress level of the fracture body increases with the increase of the inclination angle.When the crack inclination angle is the same，the cracking stress level of the fracture body increases with the increase of the loading rate.Under the condition of static loading，the cracking stress level of the fracture body with an inclination angle of 0° is roughly between 60 and 70 percent，that is，about two-thirds of the peak stress.With the increase of the inclination angle，the cracking stress level is also increase，the cracking stress level of the fractured body with a tilt angle of 90° under quasi-static loading conditions has exceeded 90%，and the cracking stress levels of the complete specimens within the static-quasi-static loading range have all exceeded 90%.

Key words: acoustic emission, loading rate, prefabricated crack, rock-like materials, crack dip, frequency domain characteristics, crack initiation stress level

CLC Number:

TU45

Jingyu GUO,Chengzhi PU,Guicheng HE,Yilong LI,Shaofeng YANG,Jiajun ZENG. Fracture Test of Rock-like Materials with Cracks and Analysis of Acoustic Emission Characteristics at Static-Quasi-Static Loading Rates[J].Gold Science and Technology, 2020, 28(6): 877-884.

Figures/Tables 5

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Fracture Test of Rock-like Materials with Cracks and Analysis of Acoustic Emission Characteristics at Static-Quasi-Static Loading Rates

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