Design Calculation of Drill-Injection Piles with Controlled Broadening and Silty-Clayed Soil Foundation Basic Interaction Parameters

The paper describes a new method of drill-injection pile installation formed by the sleeve technology with solution injection using the “fracturing” mode and the controlled broadening at the pile end. This method is aimed at high-quality and effective compaction of the soil under the strip foundation of the reconstructed building. Analyzed are the results of the in-situ tests intended to interaction of drill-injection piles manufactured by the sleeve technology and single and repeated solution injections using the “fracturing” mode and the controlled broadening at the pile end. The radius of the neighboring compacted soil massif zone was determined. The geometric parameters of the pile shaft broadening, and fractures were identified. The algorithm for calculating the basic parameters of the proposed piles was developed in order to forecast their interaction with a silty-clayed soil foundation under static loading. A comparison with classical analytical solutions after soil mechanics, theory of elasticity and plasticity was made

Generation of stress-strain state in combined strip pile foundation beds through pressing of soil

When erecting high-rise buildings, weak underlying soils cause a number of problems in design and construction. In order to ensure the required non-exceedance of the ultimate limit settlements, the combined strip pile foundation has been developed allowing the soil bed to be pre-stressed. This is achieved by injection of pressurized mortar (pressing). The paper analyzes the effect of soil pre-stressing followed by pressing of foundation with the cement mortar, as applied to existing structures using the Plaxis 3D software package in conditions of volume deformation and the Hardening Soil Model. Variable order of foundation pressing allows the required parameters of soil bed to be achieved in plan and depth, thus improving interaction with the foundation and superstructure

Generation of stress-strain state in combined strip pile foundation beds through pressing of soil

When erecting high-rise buildings, weak underlying soils cause a number of problems in design and construction. In order to ensure the required non-exceedance of the ultimate limit settlements, the combined strip pile foundation has been developed allowing the soil bed to be pre-stressed. This is achieved by injection of pressurized mortar (pressing). The paper analyzes the effect of soil pre-stressing followed by pressing of foundation with the cement mortar, as applied to existing structures using the Plaxis 3D software package in conditions of volume deformation and the Hardening Soil Model. Variable order of foundation pressing allows the required parameters of soil bed to be achieved in plan and depth, thus improving interaction with the foundation and superstructure

Design Calculation of Drill-Injection Piles with Controlled Broadening and Silty-Clayed Soil Foundation Basic Interaction Parameters

The paper describes a new method of drill-injection pile installation formed by the sleeve technology with solution injection using the “fracturing” mode and the controlled broadening at the pile end. This method is aimed at high-quality and effective compaction of the soil under the strip foundation of the reconstructed building. Analyzed are the results of the in-situ tests intended to interaction of drill-injection piles manufactured by the sleeve technology and single and repeated solution injections using the “fracturing” mode and the controlled broadening at the pile end. The radius of the neighboring compacted soil massif zone was determined. The geometric parameters of the pile shaft broadening, and fractures were identified. The algorithm for calculating the basic parameters of the proposed piles was developed in order to forecast their interaction with a silty-clayed soil foundation under static loading. A comparison with classical analytical solutions after soil mechanics, theory of elasticity and plasticity was made