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Subsidence repairs are made to rectify or mitigate the effects of subsidence, which is the gradual sinking or settling of the ground beneath a structure. Subsidence can occur due to various factors, including soil erosion, underground mining, groundwater withdrawal, or natural geological processes. Here are some common subsidence repair methods:
- Underpinning: This involves reinforcing the foundation of a building by placing additional support beneath it. Common underpinning techniques include using concrete or steel piers to stabilize and level the structure.
- Grouting: Grouting is the injection of specialized materials, such as cement or resin, into voids or cavities beneath a structure to fill them and provide additional support.
- Soil Stabilization: In cases where subsidence is caused by poor soil quality, methods like compaction grouting or soil nailing can be used to strengthen and stabilize the soil.
- Drainage Improvement: Improving drainage systems can help prevent subsidence by managing groundwater levels and reducing soil saturation. This might include the installation of drainage pipes or the modification of existing ones.
- Vegetation Management: In some cases, subsidence can be mitigated by controlling the growth of trees or vegetation with deep roots, which can extract moisture from the soil, contributing to sinking.
- Foundation Repairs: Repairing or reinforcing the building’s foundation to account for any damage or shifting caused by subsidence is often necessary.
It’s important to note that subsidence repairs can vary greatly depending on the specific circumstances and causes of subsidence. Professional assessment and engineering expertise are typically required to determine the most appropriate repair method for a given situation