基坑围护中深层搅拌水泥土桩的应用（Application of deep mixing cement soil pile in retaining wall of foundation pit）.doc

基坑围护中深层搅拌水泥土桩的应用（Application of deep mixing cement soil pile in retaining wall of foundation pit） Source: China paper Download Center [06-03-21 09:37:00] author: anonymous editor: studa9ngns - Abstract: the application of deep mixing cement soil pile in a foundation pit is analyzed, and the construction technology and application effect of the new curtain without support, retaining and water retaining in the pit are discussed. Key words: foundation pit bracing; deep mixing; cement soil pile First, deep mixing cement soil pile as foundation pit enclosure overview 1. Suitable geological conditions The deep mixing pile is suitable for dealing with such soils as silt, silt soil, silty soil and cohesive soil with high water content and standard bearing capacity of less than 120kPa. When treating peat soil or ground water with erosion, it is necessary to determine its applicability by test, and the influence of negative temperature on treatment effect should be paid attention to during winter construction. 2, determine the standard value of bearing capacity of deep mixing cement soil pile composite foundation (1) through the field composite foundation load test to determine (2) determined by the following formula FSP, k=m * Rdk/Ap+ beta (1-m) FS, K Standard values of bearing capacity of composite foundation in FSP and k; M -- area replacement rate; Ap - section area of pile; FS, K -- standard value of bearing capacity of natural foundation between piles; When the soil at the end of the pile is soft soil, it is advisable to 0.5-1.0, and when the soil between the piles is hard soil, it is advisable to 0.1-0.4, and when taking into account the role of soft soil between piles, it is desirable to zero. Rdk -- the standard value of the direct bearing capacity of single pile should be determined by field single pile loading test The retaining structure of foundation pit is a temporary retaining structure. Under the premise of ensuring the safety and applicability during construc