Experimental research on mechanical properties and re-fracture feature of anchorage body in post-peak

被引：0

作者：

Wang Q. ^{[1
,2
]}

Ye H. ^{[1
,2
]}

Xie W. ^{[3
]}

Lei T. ^{[1
,2
]}

Jing S. ^{[4
]}

Li N. ^{[1
,2
]}

机构：

[1] Key Laboratory of Hubei Province for Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan, 430070, Hubei

[2] School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, Hubei

[3] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, 221116, Jiangsu

[4] School of Mines, China University of Mining & Technology, Xuzhou, 221116, Jiangsu

来源：

Ye, Haiwang (yehaiwang369@hotmail.com) | 2018年 / China University of Mining and Technology卷 / 35期

关键词：

Anchorage body; Mechanical characteristic; Post-peak rock; Re-fracture feature; Similar simulation test;

D O I：

10.13545/j.cnki.jmse.2018.06.004

中图分类号：

学科分类号：

摘要：

According to mechanical properties and re-fracture feature of anchorage body in post-peak, similar simulation experiment was adopted. Post-peak fracture test block and lots of bolts and triaxial loading were considered in the experiment. The three triaxial experimental instrument for large scale (300 mm×300 mm×300 mm) similar simulation of anchorage body was designed and made. The method of integrated test block loading and unloading in advance was aimed to process post-peak fracture block. Simulation experiment was carried out in the situation of different bolt's space and pretention. The results show that: there are three stage characteristics which are increasing period and stable period and decreasing period of post-peak anchorage body load in the situation of triaxial loading. There are several peak values in the stable period. With bolt's space increasing, peak value and fluctuation amplitude of peak value are reducing. Meanwhile degree of block plane is reducing, and blocks extrude from the free region between with adjacent bolts. Both peak value and fluctuation amplitude of peak value increase when bolt's pretention increasing. Load capacity of anchorage body is improved. The peak value of bolt load is transferred from prophase to anaphase of anchorage body loading stage by higher bolt's pretention. Supporting function of bolt is fully played in the loading anaphase of post-peak anchorage body. There are some deformation characteristics of center raising and concave boundary on the free face of anchorage body. The bolt control effect on free face rock is decreasing. And the rock of free face without bolt effect is in the state of rupture and desquamate. © 2018, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：1115 / 1121

页数：6

共 10 条

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