软土场地CFG桩复合地基适用性试验研究

Test Study of CFG Pile Composite Foundation's Applicability in Soft Soil Site Located

本文在沉积了深厚软土地层的浙江沿海某电厂场地开展CFG桩复合地基适用性试验研究。通过对比单桩竖向抗压静载荷试验和复合地基静载荷试验成果,发现虽然承载力满足要求,但复合地基效果未充分发挥,桩间土承载力发挥系数β的最大取值约为0.5,远小于规范条文给出的0.9~1.0的经验值,CFG桩复合地基在深厚软土地基条件下适用性较差。给出了将褥垫层厚度适当增大,以提高桩间土体分担荷载比例的建议。

The applicability test of CFG pile composite foundation is carried out in a power plant site at the coast of Zhejiang Province where deep soft soil is deposited. By comparing the vertical compressive static load test of single pile and the static load test results of composite foundation, it is found that although the bearing capacity to meet the requirements, but the effect of composite foundation is not fully play; the maximum value of t3 is about 0.5, which is much smaller than the empirical value of 0.9 to 1.0 given in the code; CFG pile composite foundation is poor in applicability in deep soft soil site. Recommendation is the proportion of soil load between the piles. proposed that increase in the thickness of the cushion to increase