Development of Roof Control Techniques for Massive Roof Problems in Longwall Operations.
Debakker P; Harvey A; Cleary M; Hawkes TM
NTIS: PB/81-125270 :191 pages
The objective of this investigation was to design a mechanical roof- breaking device suitable for breaking massive roof and for use with the general range of roof support equipment in longwall operations. Given the state-of-the-art in rock mechanics of the loading requirements to break off massive overhung roof in a longwall operation, two different roof-breaker mechanisms were developed. The most popular roof supports were evaluated for their suitability to be equipped with either of the two mechanisms. The results indicate that the state-of-the-art rock mechanics is not sufficiently advanced to confidently predict roof breakage.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.