大直径嵌岩斜桩冲击成孔速度的影响因素分析
投稿时间:2020-10-21  修订日期:2020-12-29  点此下载全文
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作者单位邮编
胡培强 江西省地质工程(集团)公司 330029
王志明 中国地质大学(武汉)工程学院 
周伏萍 江西省地质工程(集团)公司 
谭松成 中国地质大学(武汉)工程学院 430074
尧在雨 江西省地质工程(集团)公司 
段隆臣 中国地质大学(武汉)工程学院 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:随着工程建设向外海、深水区域不断发展,大直径嵌岩灌注斜桩因其具有更好的承受水平载荷能力,在港口、码头等构筑物基础施工中得到了广泛应用。受工程场地和桩孔设计参数等的影响,该类嵌岩桩多采用冲击成孔的施工方式,且其成孔速度相对其他灌注桩施工方法仍然非常低(约为0.1 m/h)。基于此,本文建立了大直径嵌岩斜桩冲击成孔过程中的冲锤下落受力模型,并通过单因素分析和双因素耦合分析的方式研究了冲锤质量、冲击行程、桩孔斜度,以及冲锤与钢护筒之间的摩擦系数等因素对冲击成孔速度的影响规律。分析认为,在桩孔斜度确定的情况下,冲锤质量和冲击行程是影响冲击成孔效率的主要因素,而摩擦系数的影响可以不作具体要求。
中文关键词:嵌岩桩  斜桩  冲击成孔  成孔速度  
 
Influencing factors analysis of the rate of penetration during the percussion drilling of large diameter rock-socketed inclined pile
Abstract:Nowadays, engineering construction tends to offshore and deep-water areas. As a result, large diameter rock-socketed inclined (RSI) pile has been widely applied in structures foundation in port and dock areas due to its better ability to withstand horizontal loads. However, because of limited construction sites and designed piles parameters etc., the RSI piles construction is usually carried out by percussion drilling, with its rate of penetration (ROP, approximately 0.1 m/h) much lower than that of cast-in-place piles by other construction methods. Based on this, a force model of punch hammer was established in this paper, to study its forced state of dropping process when it is applied to drill a large diameter RSI pile. The influence laws of hammer weight, stroke, pile inclination, and friction coefficient between the punch and steel guard were studied by single-factor and two-factor analyses respectively. According to the analyses, it is found that the hammer weight and stroke are the key factors affecting the ROP of RSI piles when the pile inclination is constant, and the influence of friction coefficient can be ignored to a certain degree.
keywords:Rock-socketed pile  inclined pile  percussion drilling  speed of piles completion
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