Performance of Cement–Soil Pile Composite Foundation with Lateral Constraint

Matlan

Advances in Civil Engineering

et al. 2021

The focus of this study was to investigate the effect of loess soil treated with lime on the lateral-seepage response. Three groups of box experiments were carried out to study the lateral-seepage effect under different types of loess-lime structures. Automated testing systems were designed to perform experiments and collect data. Additionally, numerical analysis of lateral-seepage impact and embankment settlement was performed. Finally, moisture content and settlement were monitored to quantify lateral-seepage effect results under corresponding loess-lime treatment. Results showed that loess-lime compaction piles and diaphragm wall structures could effectively prevent lateral seepage, and the latter was better. The simulated results are similar to the measured values of the box experiment, which indicates the accuracy of the simulation analysis and further supports the experimental results of this study.

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis Study on Loess‐Lime Structures Used for Lateral Antiseepage in Deep Collapsible Ground Embankment

Matlan

Advances in Civil Engineering

et al. 2021

“…For example, cement has been adopted to ameliorate fine-grained red clay [9] and grassroots soil [10], and solidify stable contaminated soil [11][12][13] and high organic matter soil [14]. Many scholars [15][16][17][18][19] blended cement, soil, water and admixtures in different ratios into a multi-phase mixture through uniform mixing, mechanical compaction and curing, applied the mixture to various aspects of foundation treatment (e.g. CMS replacement layer, CMS mixing pile, CMS rotary jet pile), and analyzed the construction process/technique, bearing capacity and seismic response of the treated foundations.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cement-Modified Soil as Blocking Cushion of Saline Soil Subgrade

Lai¹,

Lei²,

Ji³

et al. 2020

RCMA

This paper puts forward a novel approach called cement-modified soil (CMS) blocking cushion technology to reinforce the subgrade in saline soil region: the cushion layer of composite foundation and a roadbed partition layer are combined into one CMS layer. The effectiveness of the proposed approach was verified through outdoor experiments on the saline soil section (DK821+600-DK821+900) of the newly built Lanxin High-Speed Railway. The experimental results show that the CMS layer can effectively adjusts the pile-soil stress ratio of the composite foundation, thereby enhancing the bearing capacity of the composite foundation and reducing the total settlement of the subgrade; it is also verified that the CMS layer greatly suppresses the upward migration of capillary water and water vapor in the foundation soil, and curbs the migration of salt, preventing the secondary salinization of the railway subgrade. Overall, this research provides a simple and low-cost subgrade reinforcement technique for saline soil regions, shedding new light on the engineering application of the CMS.

“…National regulations and standards: the bearing capacity of a single pile of cement soil composite pile is composed of the frictional resistance Q su on the side of the composite pile and the frictional resistance Q pu on the cross-section of the cement soil composite pile. When the interaction between the end face resistance and the side resistance is ignored, the bearing capacity of a single pile is [18]:…”

Section: Calculation Of Bearing Capacity Of Composite Pilementioning

confidence: 99%

New Foundation Treatment Technology Using Cement Soil Composite Tubular Piles Supported by Optical Fiber Sensing Technology

Sun

2023

Journal of Sensors

The purpose is to optimize the foundation’s treatment process and improve the foundation’s construction effect to better apply the cement soil composite tubular piles. This exploration is to study the cement composite tubular piles. First, the principle and application of optical fiber sensing technology are discussed. Then, the application design and conditions of the cement composite tubular pile are discussed. Finally, a new foundation treatment technology supported by optical fiber sensing technology is proposed and comprehensively evaluated based on the application of cement soil composite tubular piles. The research results show that: (1) the new foundation treatment technology reflects the optimization of the optical fiber sensing technology for the foundation treatment. Moreover, it is further optimized through the application of cement soil composite tubular piles. (2) When subjected to the same load, the longer the core pile is, the smaller the cement soil composite pile’s settlement is. When the inner core pile is 20 m ~24 m long, the settlement of the cement soil composite pile is small. When the length of the inner core pipe pile is 16 m ~20 m, the settlement range of cement soil composite pile becomes larger. (3) With the increase of friction coefficient, the settlement distance of cement soil composite tubular pile will decrease. The above data show that compared with the traditional foundation treatment technology, the new foundation treatment technology designed based on the application of composite tubular piles, supported by optical fiber sensing technology, can well solve the foundation construction problems, avoid pavement settlement, cracking, and other phenomena, and ensure the overall safety of the road. This exploration fully reflects the advantages of the new technology of foundation treatment and ensures the quality of road engineering. It provides a reference for the development of foundation treatment technology of construction projects and contributes to the development of the construction industry.