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注浆地基处理技术与混凝土桩相结合,形成注浆+小型混凝土桩新型复合地基,一方面混凝土桩在地基中形成高强度的增强体,另一方面,通过注浆,浆液在压力的作用下渗透、挤压、劈裂土体,在地基土中形成高强度的水泥浆脉,大幅度提高桩间土的承载力,从而达到降低复合地基中桩土应力比、减少混凝土桩的桩径、降低施工成本的效果。本文以长沙某医院综合楼软弱地基为例,采用复合地基理论,对地基加固参数进行设计计算,工程实施后检测结果表明,注浆+小型混凝土桩新型复合地基可提高地基承载力承载力40%,桩间土强度可提高25%,可供类似软土地基处理设计施工参考。
Grouting foundation treatment technology combined with concrete piles to form a new composite foundation grouting + small concrete piles, on the one hand the concrete piles in the foundation to form high-strength reinforcement, on the other hand, by grouting, grout under pressure Infiltration, extrusion, splitting of soil, the formation of high-strength cement slurry in the foundation soil, greatly enhance the bearing capacity of soil between piles, so as to reduce the stress ratio of pile and soil in composite foundation to reduce the pile diameter of concrete piles, Reduce construction costs effect. In this paper, a hospital complex in Changsha, a weak foundation, for example, the use of composite foundation theory to design and calculation of foundation reinforcement parameters, the project after the test results show that the new composite foundation grouting + small pile can increase the bearing capacity of 40% , Soil strength between piles can be increased by 25%, for similar soft soil design and construction of ground reference.