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您的检索式：作者名="Wendy TIMMS"
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| 1 | Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines显示文摘The service failure of rock bolts and cable bolts are frequently reported issues in underground coal mines. Whilst numerous experimental investigations concerned with the service failure of bolts have been conducted, numerical modelling offers an alternative approach in evaluating the factors contributing to service failures of bolts in underground mines. In this study, analysis of the influence of groundwater and tensile stress on bolts in underground coal mines was studied through the numerical modelling of a grouted bolt in the immediate roadway roof. Bolt tensile stress and groundwater dripping rates in the immediate roadway roof were analysed using a package based on finite element method to assess the effect of coal roof thickness and claystone bands, as main contributors of known service failures of bolts in roadways of underground coal mines. Increasing coal roof thickness was found to increase bolt dripping rates. Probable location of stress corrosion cracking (SCC) occurrence was established through examining the shift and increase in maximum bolt tensile stress that was exhibited along the bolt length with increasing coal roof thickness. Claystone bands situated at the top and centre horizon of a grouted bolt produced lower bolt dripping rates compared with scenarios with no claystone bands. Intersecting claystone bands at the centre horizon of a bolt for a fully grouted bolt could increase the likelihood of SCC corrosion and bolt failure by contributing to microbial corrosion processes and grout fracturing by tensile stress. This study improves the understanding the bolt failure associated with the presence of groundwater and changing stress environments, which in turn is imperative in formulating strategies to mitigate support element failures and improve the ground support viability. | Jack A.Smith Hamed Lamei Ramandi Chengguo Zhang Wendy Timms | 2019 | International Journal of Coal Science & Technology2019，6，2： | 5 |
| 2 | 地下煤矿锚杆(索)过早失效腐蚀环境的水文地球化学模拟显示文摘锚杆(索)被广泛应用于地下采矿和巷道掘进过程中以提高顶板稳定性。由于锚固材料的腐蚀敏感性、所处潮湿、腐蚀环境以及拉伸应力的影响,锚杆(索)的过早失效是地下开采工程中存在的重大安全隐患。本文将实验室实验与水文地球化学模型相结合,对地下煤矿水环境下锚杆(索)的腐蚀破坏进行了研究。根据实验数据和矿井水水化学数据,采用PHREEQC软件对锚杆(索)与矿井地下水和岩层材料间腐蚀反应进行了模拟分析。建立了一系列的模型量化铁和碳元素反应量,模拟了有氧和无氧条件下水环境中的化学反应,得到各离子浓度、pH和随反应进度的变化趋势,并与实验结果进行对比。结果表明,锚杆(索)的腐蚀受到某些自然环境因素的抑制,因为水中溶解氧可以促进更多铁氧化。通过水文地球化学模拟等手段,阐明了锚杆(索)周边环境是影响其应力腐蚀开裂过程的重要因素。 | 彭亚 Wendy TIMMS | 2020 | Journal of Central South University2020，27，5： | 0 |
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