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徐  洪^1,2，楊建國(guó)^1,2，黃潤(rùn)英^1,2
(1 重慶地質(zhì)礦產(chǎn)研究院煤炭資源與安全開采國(guó)家重點(diǎn)實(shí)驗(yàn)室重慶研究中心，重慶400042；2重慶市國(guó)土資源和房屋管理局礦產(chǎn)地質(zhì)與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室，重慶400042)

[摘要] 從彈性力學(xué)理論出發(fā)，借鑒地面鋼筋混凝土結(jié)構(gòu)中構(gòu)件銹脹開裂的研究成果，并考慮地下錨固環(huán)境受圍巖及初始地應(yīng)力影響的特殊情況，引入圍巖初始應(yīng)力影響系數(shù)以及圍巖初始應(yīng)力影響函數(shù)兩個(gè)變量，對(duì)錨桿銹蝕導(dǎo)致砂漿保護(hù)層開裂的過(guò)程進(jìn)行了分析。研究結(jié)果表明圍巖初始應(yīng)力對(duì)砂漿保護(hù)層的最大開裂半徑起著控制作用，當(dāng)圍巖初始應(yīng)力超過(guò)某一臨界值時(shí)，砂漿內(nèi)部裂縫會(huì)穩(wěn)定擴(kuò)展到砂漿外表面，而當(dāng)圍巖初始應(yīng)力低于這個(gè)值時(shí)，砂漿內(nèi)部裂紋最大穩(wěn)定擴(kuò)展半徑隨應(yīng)力的增加近似按線性關(guān)系變化。針對(duì)理論結(jié)果，采用有限元分析方法對(duì)其進(jìn)行了驗(yàn)證，驗(yàn)證結(jié)果表明二者吻合很好。
[關(guān)鍵詞] 錨桿錨固體；銹脹開裂；最大穩(wěn)定擴(kuò)展半徑；錨桿銹蝕率；初始應(yīng)力

Research on corrosion cracking process of bolt anchorage body consideration of the affection ofinitial ground stress
Xu Hong^1,2, Yang Jianguo^1,2, Huang Runying^1,2
(1 Chongqing Institute of Geology and Mineral Resources Chongqing Research Center of State Key Laboratory of Coal Resources and Safe Mining, Chongqing 400042, China;  2 Key Laboratory of Geology for Mineral Resources & Environment, Chongqing Administration of Land, Resources and Housing, Chongqing 400042, China )

Abstract: Starting from the elastic mechanics theory, using the research results of corrosion cracking on reinforcement concrete structure for reference, and considering the special cases that anchorage body is affected by surrounding rock and the initial ground stress, the influence coefficient and influence function are introduced to analyze the process of that bolt corrosion leading to mortar cover cracking. The research results shows that the max cracking radius of mortar cover is controlled by surrounding initial stress, if surrounding initial stress is greater than a certain value, the cracks in mortar cover can growth to the mortar outer surface stably, and if initial stress is lower than the value, the max cracking radius change linearly with the initial stress. Aiming at The finite element analysis method is used to verify the theory results, the two results fit well.
Keywords: bolt anchorage body; corrosion cracking; max stable cracking radius; bolt corrosion rate, initial stress