【正文】 osition and the correct installation of drilling machine, the rig drilling machine, first use of the power drill and near the cage with the drill pipe, moving roughly position, and then Jack rack jacking, accurate positioning, so that the lifting pulley, drill bit or fixed drill hole cards and casing center in a vertical line, in order to ensure the verticality of the drilling rig. Drilling position deviation is not more than 2cm. Aligned with the pile location, with sleeper flat drill beam at the top of the tower, and symmetrical to the drill axis pulling cable wind rope. (3) buried tube Underground water level below the Kong Bitu under the hydrostatic pressure to the hole collapse, and even the phenomenon of flow of sand. If you can keep the borehole wall high underground water head, increase the hole hydrostatic pressure, to prevent collapse hole, hole wall. Casing in addition to play this role, at the same time, good isolation of surface water, ground, protecting the orifice pile hole drill guide fixed (4) slurry preparation Drilling mud is posed of water, clay ( bentonite ) and an additive position. A floating drilling waste slag cooling the drill bit, drill, lubrication, increasing hydrostatic pressure, and in the hole wall to form a slurry, partition within the bore to prevent seepage, the hole collapse effect. Modulation of the drilling mud and circulating purifying mud, should be based on the drilling method and formation conditions to determine the slurry consistency, slurry consistency should be considered stratigraphic changes or operational requirements of motor control, the mud is too thin, small, poor effect of elimination of slag wall。三江學院 畢業(yè)設計 (論文 )外文資料翻譯 附件： （約 3000 漢字）； (與課題相關的 1 萬印刷符號左右 )。 指導教師評語： 指導教師簽名： 年 月 日 院 系 土木工程 專 業(yè) 建筑工程 學生姓名 許學斌 班級學號 B08084066 外文出處 Knight M A, Mitchell R J. Modeling of light nonaqueous phase liquid (LNAPL) releases into unsaturated sand .Canadian Geotechnical Journal, 1996,33, 33 :913925 . Bored pile Summary Drill ( flushing, dig ) pile from the nieen sixties, beginning in Henan province Nanyang region since the development application, because of its many advantages, has been widely used in soft soil, loess, including soil, expansive soil and other special types of foundation and industrial, civil, municipal, railway, highway, port and other types of Engineering practice. And precast pile, bored pile construction of no noise, no vibration, on the surrounding buildings and small environmental impact, pile diameter, buried deep, large bearing capacity. China39。 slurry is too thick will weaken bit impact function, reduce drilling speed. (5) drilling The borehole is a key working procedure, in construction must strictly according to the operating requirements, in order to ensure drilling quality, attention must be given to the hole quality, must be opposite for this good midline and verticality, and pressed well casing. Must pay attention in the construction are continuously added and pumping the slurry slag ( impact type ), but also at any time to check whether there is deviation phenomenon into hole. Using the impulse or cl