In analyzing a slab raft connected to a group or field of piles, it is important to determine the computed resistance and flexibility of the piles. The performance of a separately embedded pile (single pile) differs from that of a pile acting as a component part of a simultaneously embedded pile group. Here, the character of the work performed by the pile will depend on its positioning (edge, corner, frontal, or interior) within the group.According to Mandolini et al.[1], investigations associated with the interaction of piles within a group are basically reduced to either observance of pile settlements, or numerical analysis of interaction between the piles and soil. Experimental investigations of the distribution of forces within piles functioning as component parts of a group are inadequate. The redistribution of forces in piles during loading is examined in [2][3][4][5][6]. In Russia, Deval'tovskii [7] has occupied himself with one of the first problems of the interaction of piles within a group − measurements of forces in the piles. Differences in the interaction between the piles and soils are confirmed experimentally in all of the indicated studies as a function of their arrangement within the group. Until now, however, no in-situ measurements have been made.The performance of a group of piles as a function of their arrangement within the pile field was investigated during the design and construction of the foundations of a monolithic high-rise building located in a densely developed region in the Moscow River Valley (Pavshinsk bottomland).In geomorphologic respects, the construction site is confined to the bottomland terrace of the Moscow River. Absolute ground-surface elevations (around the excavations) range from 130.3 to 131.5 m.Fill soils, modern upper-and middle-Quaternary alluvial deposits, upper-Carboniferous eluvium deposits, and upper-Carboniferous deposits reside to a depth of 25.0-35.0 m in the geologic structure of the site. Geologic-engineering sections (GES) of the construction site at the locations where the piles are located are shown in Fig. 1. Figure 2 shows the arrangement of piles in plan, while Table 1 presents physico-mechanical characteristics of the soils.Results are presented for analyses and experimental investigation of the interaction between piles and soil with consideration of their positioning as defined during design and construction of the foundations of a monolithic high-rise building with a varying number of stories (height ranging from 70 to 90 m).

No abstract

No abstract

No abstract

The main results of the work on the analysis of the possibility of using polyacrylamide drilling muds for the installation of drill piles, barrettes and slurry walls in sandy soils are presented. The results of the study of the possibility of solutions to keep the walls of boreholes from collapse, laboratory studies of the effect of polyacrylamide solutions on the shear strength of soils, as well as the results of field tests of piles with static pulling load are reflected.