Abstract: Mine dustproof water supply network is a main underground dustproof facility and its operational reliability directly influences the dusting result. The paper analyzes the main factors that can lead to the dustproof network failures and establishes the fault tree correspondingly. Through qualitative analyses, 31 minimal cut sets are obtained. Expert judgment method and fuzzy sets theory are used in combination to assess the fuzziness of base events of the fault tree. Taking as example a base event of “starting water hammer”, its fuzzy failure value rate is calculated to be 0.001 2. The failure rates of various factors are compared and it is found that the main factors leading to the network failures are in turn third-party interference, chemical erosion, impurities blockage and accessory equipment failure.

Key words: Water supply network for dust-proofing, Fault tree analysis, Fuzzy sets theory, expert judgment, Fuzzy failure rate