Together, we solve the challenges of tomorrow.
SEE MORE →Ground improvement in Bognor Regis encompasses a suite of geotechnical techniques designed to enhance the engineering properties of soils, enabling safe and cost-effective construction on sites where natural ground conditions are less than ideal. This category is vital for transforming weak, compressible, or loose deposits into competent strata capable of supporting structural loads, mitigating settlement, and providing resistance to liquefaction. In a coastal town like Bognor Regis, where development pressure on available land is constant, the ability to improve in-situ soils rather than resorting to deep piled foundations or expensive soil replacement often represents the most viable and sustainable engineering solution for a wide range of projects.
The local geology of Bognor Regis is dominated by Quaternary superficial deposits overlying the Cretaceous Chalk. The principal challenge lies within the Brickearth deposits and, more critically, the extensive areas of marine and estuarine alluvium found in the lower-lying parts of the town and along the Aldingbourne Rife corridor. These alluvial soils typically consist of soft clays, silts, and loose, saturated sands, which exhibit low bearing capacity and high settlement potential. The presence of a high groundwater table, closely linked to tidal influences in near-coastal zones, further complicates excavation and foundation design, making ground improvement techniques that work below the water table, such as vibrocompaction design, particularly relevant.
All ground improvement design and execution in the UK must comply with the rigorous framework set out in Eurocode 7 (BS EN 1997 Geotechnical Design) and its UK National Annex, alongside the execution standards such as BS EN 14731 for deep vibration techniques. The specification for ground treatment must be developed from a thorough ground investigation compliant with BS 5930, which defines the soil parameters critical for selecting and verifying the improvement method. For projects involving cohesive soils, where the primary aim is to increase bearing capacity and control total and differential settlement, the design of stone column design solutions must adhere to established methods like the Priebe method, with rigorous in-situ testing such as plate load tests to validate performance.
This category of work is essential for a diverse array of projects typical of a growing seaside town. Residential developments, from small infill plots to large greenfield housing estates, frequently encounter problematic soils requiring improvement to meet warranty provider requirements for floor slabs and foundations. Commercial and industrial buildings, often with heavily loaded ground-bearing slabs, demand a high-performing platform. Infrastructure projects, including road embankments over soft alluvium and the construction of sustainable urban drainage systems (SuDS), rely heavily on ground improvement to ensure stability and functionality without excessive long-term maintenance. The design and execution of these techniques, from vibrocompaction design for granular soils to stone column design for cohesive deposits, form the core of modern geotechnical practice in the region.
Ground improvement involves modifying the physical properties of a soil mass to increase its bearing capacity, reduce its compressibility, or mitigate its liquefaction potential. This is achieved through mechanical methods like deep vibration, the introduction of stiffer elements such as stone columns, or by mixing in binders. The goal is to create a competent ground platform for foundations without the need for deep piling or soil replacement.
Ground improvement is often preferred over piling for lightly to moderately loaded structures like housing, low-rise commercial buildings, and embankments. It is typically more cost-effective as it treats the soil mass directly, allowing for simple pad and strip foundations and a ground-bearing floor slab, eliminating the costly structural slab and pile cap system required by a piled solution.
The correct method is determined by a comprehensive ground investigation that identifies the soil types, their strength, and the groundwater conditions. Granular soils are best treated by vibrocompaction, while cohesive soils like soft clays require reinforcement with stone columns. A specialist designer will use this data to select a technique that meets the project's specific settlement and bearing capacity requirements.
The design is governed by Eurocode 7 (BS EN 1997), which requires a limit-state design approach. Execution is covered by standards like BS EN 14731 for deep vibration and BS EN 15237 for vertical drains. A ground investigation to BS 5930 is a prerequisite, and validation testing, such as plate load tests or cone penetration tests, is essential to verify the design assumptions and workmanship.
We serve projects across Bognor Regis and surrounding areas.