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多年以来,湿陷性黄土地区的房屋地基处理一直是设计和施工较难掌握的一个疑难问题。特别是自重湿陷性黄土地基,设计上往往为了安全和保险起见,一般都习惯采用2:8灰土或3:7灰土整片换填的保守作法,从而使工程造价大幅度提高。据统计:地基处理采用灰土挤密桩比整片灰土换填,能节省造价占地基部分造价的20%以上。西铁分局管内新丰镇地区为三级自重湿陷性黄土地区,我们通过将原设计3:7灰土换填改为灰土挤密桩,并加强施工管理和运用先进技术检测方法,不仅满足了设计要求,保证了工程质量,而且还降低了工程造价,取得了比较满意的效果。
For many years, the foundation treatment of collapsible loess area has been a difficult problem to be mastered in design and construction. In particular, self-weight collapsible loess foundation, often designed for safety and security reasons, is generally accustomed to the conservative approach of replacing 2: 8 limestone or 3: 7 limestone, resulting in a substantial increase in project cost. According to statistics: the foundation treatment using lime-soil compaction pile replacement than the whole piece of lime soil can save cost over 20% of the cost of foundation. In the area of Xinfeng Town under the management of the West Rail Branch, it is a three-level self-weight collapsible loess area. We changed the original design 3: 7 lime-soil replacement to lime-soil compaction pile and strengthened construction management and application of advanced technology testing methods. Design requirements to ensure the quality of the project, but also reduce the project cost, and achieved satisfactory results.