3 years ago

Failure characteristics of large unconfined cemented gangue backfill structure in partial backfill mining

Xianjie Du, Guorui Feng, Tingye Qi, Yuxia Guo, Yujiang Zhang, Zehua Wang

Publication date: 10 January 2019

Source: Construction and Building Materials, Volume 194

Author(s): Xianjie Du, Guorui Feng, Tingye Qi, Yuxia Guo, Yujiang Zhang, Zehua Wang

Abstract

For the subsidence prevention purpose, partial backfill mining is employed. The mined-out area is supported by carefully designed backfill piers and strips. The stability of these unconfined backfill structures (UBS) is very important to the mining operation. In order to study the failure characteristics of UBS, the stress-strain curve of a large cemented gangue backfill material (CGBM) test block (800 × 800 × 800 mm) was derived through uniaxial compression test. The failure process of the test block was monitored by digital image correlation (DIC) and ultrasonic testing (UT) techniques. The internal pressures and deformations were monitored by sensors embedded at different depths in the test block. It is found that: 1) The curves of internal pressure and deformation can be divided into four stages. 2) A hard core is formed in the central part of the test block under uniaxial compression load. 3) The three manifestations of the curves of internal pressure or deformation can be used as the failure precursor point, critical instability point, residual bearing capacity or residual deformation of the test block respectively. The experimental findings could be used to guide the design, stability monitoring and reinforcement of UBS in partial backfill operations.

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.