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为研究大厚度自重湿陷性黄土地区地基处理深度与剩余湿陷量的合理控制关键技术难题,对采用不同处理深度的挤密地基进行了大面积深层浸水载荷试验。试验结果表明:对采用挤密地基处理在6~12 m深度以下进行深层浸水后均发生不同程度的地基湿陷下沉,而地基处理在15 m深度时(剩余湿陷量远大于200 mm)地基整体实际下沉量相对较小,说明现行的《湿陷性黄土地区建筑规范》对乙、丙类建筑地基关于最小处理深度的规定过于严格,不符合现有的经济技术水平,建议在采取一定措施的情况下将12~15 m作为乙、丙类建筑在大厚度自重湿陷性黄土地区地基处理的合理深度。并针对现行规范中对乙、丙类建筑剩余湿陷量控制的不合理之处,提出了“剩余湿陷量折减系数”这个概念,并提出了该折减系数的建议值,可为同类工程建设和规范修订提供一定的参考。
In order to study the key technical problems of the reasonable control of the foundation treatment depth and remaining collapse amount in the heavy thick collapsible loess area, large area deep submerged loading test was conducted on the compacted foundation with different treatment depths. The results show that subsidence of subsoil of subgrade with different depth after deep submergence under 6 ~ 12 m depth is affected by the compaction foundation treatment, while when subgrade is treated at depth of 15 m (the remaining subsidence is much larger than 200 mm) The actual subsidence of the whole foundation is relatively small, which shows that the current Code for Construction of Collapsible Loess Area has too strict rules on the minimum depth of treatment for subgrade B and C and does not conform to the current economic and technical level. In case of certain measures, 12 ~ 15 m shall be taken as the reasonable depth for treatment of B and C buildings in the foundation with large thickness and self-weight collapsible loess area. In the light of the unreasonable control of the remaining collapse of Class B and C buildings in the current code, the concept of reduction coefficient of residual collapse is proposed and the proposed value of the reduction factor is proposed It provides some reference for the construction of similar projects and the revision of codes.