一种软硬互叠岩层钻孔灌注桩钻进技术-中南大学学报.PDF

41 3 () Vol.41 No.3 2010 6 Journal of Central South University (Science and Technology) Jun. 2010 1, 2 1 1, 2 1 (1. 410083 2. 410014) (300~500)30% 1 P634. 5 A 1672−7207(2010)03−1109−07 Drilling technology of bored-pile in alternating layer of hard and soft rock 1, 2 1 1, 2 1 LIU Mu-feng , PENG Zhen-bin , WANG Jian-jun , PENG Wen-xiang (1. School of Geoscience and Environmental Engineering, Central South University, Changsha 410083, China; 2. Coal Geology Bureau of Hunan Province, Changsha 410014, China) Abstract: According to engineering geological characteristics of one bridge, mud protection mechanism and water sensitivity of silty mudstone, laboratory test was adopted to determine the mix of mud and anionic. The PAM with 6 and hydrolysis degree of 30% were used as flocculant to modulation mud. By relative molecular mass of (300−500)10 the mechanism of broken rock by the hob, the hob with a knife cutting force and specific energy changing with pitch was discussed, and hob-breaking point of invasion of deep-rock track was analyzed and calculated, a kind of new combination hob layout met