Ground Improvement & Pile Foundation Engineering

• Ground-improvement design should address ground variability, groundwater, required improvement depth, target strength and settlement criteria.
• Large-area soft-ground treatment can use trial sections, construction monitoring and testing to verify construction parameters and quality.
• Different methods can be zoned where obstacles, access limits or ground variability affect the suitability of a single process.

Selected Applications

• Hong Kong International Airport Third Runway - Land-side DCM: The land-side DCM program covered approximately 1.5 million m², with typical treatment depths of about 20-35 m. Four-shaft high-strength deep mixing was used for large-scale soft-ground improvement, while adapted methods were used in zones affected by obstacles or different ground conditions.
• Hong Kong International Airport Third Runway - DJM Zones: DJM was applied in areas where conventional DCM construction was constrained, including zones affected by former embankments or difficult ground. The work required control of treatment diameter, pressure, direction and water-cement ratio under airport operating restrictions.
• Large Gravel-Pile Ground Improvement - Zhejiang Storage Base: Approximately 200,000 m² of hydraulic-fill ground was treated mainly with gravel piles, with treatment depths exceeding 25 m and pile diameters reaching 1.0 m. More than 20 large machines were deployed for the large-volume program.

• 地基处理需结合地层差异、地下水、处理深度、目标强度及沉降指标进行针对性设计。
• 大面积软土地基处理可通过试验段、施工监测及检测验证施工参数与质量。
• 当障碍物、设备通行或地层变化限制单一工法适用性时，可分区采用不同处理方法。

代表性应用

• 香港国际机场第三跑道 - 陆上 DCM 地基处理： 陆上 DCM 处理面积约 150 万平方米，常规处理深度约 20-35 米，采用四轴高强度深层搅拌开展大面积软土地基处理；在障碍物或不同地层条件区域结合适配工法施工。
• 香港国际机场第三跑道 - DJM 处理区域： 在原有堤坝、复杂地层等常规 DCM 受限区域采用 DJM 处理，需要在机场运营及限高等约束下控制处理直径、压力、方位和水灰比等参数。
• 浙江大型储运基地碎石桩地基处理： 约 20 万平方米吹填地基处理，主要采用碎石桩，处理深度超过 25 米，桩径达到 1.0 米，投入 20 余台大型设备组织施工。