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通过现场标贯试验分析后注浆对桩周土层的加固作用,分别研究不同水灰比浆液注入时,距离桩身不同距离处土体标贯击数的提高情况,并对试验结果进行对比分析。结果表明:后注浆能有效挤密桩周土体,提高土体的标贯击数,距离桩基越近,加固作用越明显;水灰比较小的浆液由于注入性较差,引起的桩周挤密作用更明显,相对于粉土和黏土而言,浆液对砂土的挤密加固作用更好。
Through field test, the reinforcement effect of post-grouting on the soil around the pile was analyzed. The improvement of the standard penetration number of soil at different distances from the pile body under different water-cement ratio injection was studied respectively. The test results were compared analysis. The results show that the post-grouting can effectively squeeze the soil around the pile and improve the number of standard penetration of the soil. The closer the pile to the foundation, the more obvious the reinforcement effect. The smaller the grout with water-cement ratio, The effect of compaction of the week is more obvious. Compared with the silt and clay, the grout has a better effect on the compaction and reinforcement of the sand.