软基处理粉喷桩施工控制(国外英文资料).docVIP

软基处理粉喷桩施工控制(国外英文资料) Construction control of soft foundation treatment powder spraying pile Wangrongqin (Jiangxi highway and Bridge Engineering Bureau, Nanchang 330000) Abstract: Aiming at the soft soil road high fill subgrade settlement is difficult to control, through the soft soil foundation treatment of DJM pile Ma Wu highway The successful practice aims to introduce the experience gained in the construction of the powder jet pile and various testing methods. Key words: road engineering; soft foundation treatment; powder injection pile; control 0 Preface The K36+050-K38+652 section of Ma Wuhu Expressway belongs to the lower reaches of the Yangtze river. The formation of this soft soil is complicated, and it is composed of multi-element soil structure. The spatial distribution is different and the horizon is complex. The thickness of soft soil varies greatly and varies greatly in nature. According to the exploration of the foundation along the line, it is divided into three geological layers: I layer, soft plastic, low liquid limit clay, continuous distribution and depth 0-2.3m. The II layer is dominated by flowing plastic mud and low liquid limit clay, and the local is silty silty clay with low liquid limit. It is sandwiched between low liquid limit silty sand and low limit clay, and the depth is about 2.3-7m. The III layer is mainly made of soft, hard plastic and low liquid limit clay, sandwiched between dense and low liquid limit silty sand. The compressibility is low and the depth is about 7-14m. Through the calculation and analysis of deep foundation treatment in small structures and bridge abutment, design using powder jetting mixing pile (dry) soft foundation treatment, to control the structure through the spacing of DJM pile settlement after construction. 1 construction principle 1.1 original foundation structure The structure of the original foundation shows that the natural water content and the natural void ratio are too large, which makes the bearing c