RESULTS OF A STUDY OF STRESS-STRAIN STATE OF THE SOIL MASS AROUND THE RESULTING BROADENING AT THE END DRILL-INJECTION PILE
Statement of the problem. The article provides an analysis of the results of full-scale test in actual field conditions of the interaction of piles with the clayous soil foundation associated with the research of the radius of the consolidated zone, vertical deformations of the soil mass around the zone of widening and changes its initial state of stress. Results. A pile having at its end a broadening in the form of a membrane cup was designed. Static studies showed that a controlled broadening at the end of the pile on average causes a two-fold increase in the load-carrying capacity of the soil mass in the area of the broadening. According to the results of the fieldwork to investigate the interaction of piles with a clayous soil foundation, the radius of the compacted area, vertical displacements of the soil mass in the area of the broadening and changes of its initial stress-strain state were determined. Conclusions. The fieldwork data have shown the feasibility of a controlled broadening in the form of a membrane cup at the end of drill-injection pile. Studies have shown a significant improvement in the characteristics of the soil after the formation of the broadening at the end of the pile.