【摘要】：對于礦區(qū)鉆孔作業(yè)存在的粉塵污染嚴(yán)重、巖礦心采取困難等問題,常規(guī)金剛石鉆進取心難以滿足現(xiàn)場施工要求。采用貫通式潛孔錘反循環(huán)連續(xù)取心技術(shù)替代常規(guī)金剛石取心工藝,在保證了較高鉆進效率的同時,可有效解決干旱缺水礦區(qū)存在的取心及其引起的污染問題,保障施工人員的身體健康。為此,筆者所在課題組研發(fā)了兩種新型潛孔錘反循環(huán)鉆頭并進行了野外試驗,同時,運用LSDYNA數(shù)值模擬對設(shè)計的兩種反循環(huán)鉆頭進行了強度分析。試驗結(jié)果表明,兩種鉆頭均具有較好的碎巖鉆進效果,但花鍵內(nèi)噴孔式反循環(huán)鉆頭易發(fā)生斷裂;數(shù)值模擬分析結(jié)果顯示,鉆頭的最大應(yīng)力遠高于材料疲勞極限是造成鉆頭破壞的根本原因,數(shù)值模擬結(jié)果與試驗結(jié)果取得了較好的一致性。由此證實了花鍵內(nèi)噴孔式反循環(huán)鉆頭結(jié)構(gòu)存在缺陷,設(shè)計時應(yīng)盡量避免在內(nèi)噴孔周圍設(shè)置環(huán)槽,以保證鉆頭體強度。
[Abstract]:For the serious dust pollution existing in the drilling operation of mining area and the difficulty in taking the core of the rock, it is difficult for conventional diamond drilling to meet the requirements of field construction. The reverse circulation continuous coring technique of through-through down-hole hammer is used to replace the conventional diamond coring technology, which can guarantee higher drilling efficiency and solve effectively the problems of coring and pollution caused by dry and water-short mining areas. To ensure the health of the construction staff. For this reason, the author's team has developed two new reverse circulation drill bits with down-hole hammer and carried out field tests. At the same time, the strength analysis of the two kinds of reverse circulation drill bits has been carried out by using LSDYNA numerical simulation. The test results show that both kinds of bits have good drilling effect, but the back circulation bits with jet holes in spline are prone to fracture, and the numerical simulation results show that, The maximum stress of the bit is far higher than the fatigue limit of the material, which is the root cause of the damage of the bit. The numerical simulation results are in good agreement with the experimental results. Therefore, it is proved that there are defects in the structure of the spout hole type reverse circulation bit, and the ring groove should be avoided in the design to ensure the strength of the drill bit.
【作者單位】： 吉林大學(xué)建設(shè)工程學(xué)院;
【基金】：中國地質(zhì)調(diào)查局項目(12120113096900)~~
【分類號】：P634.41

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