上覆回填土的吹填淤泥地基反向真空预压法试验研究

高紫阳; 王军; 高明伟; 朱萧霄; 符洪涛; 徐昭; 吕有畅

doi:10.11779/CJGE20240159

上覆回填土的吹填淤泥地基反向真空预压法试验研究 English Version

1.
温州大学建筑工程学院, 温州市, 325035, 中国;2
1.
温州大学建筑工程学院, 温州市, 325035, 中国
5.
温州市瓯飞开发建设投资集团有限公司, 温州市, 325000, 中国

基金项目: 国家自然科学基金项目(52325806);国家自然科学基金项目(42407208);国家自然科学基金项目(W2411045);国家自然科学基金项目(52408388);浙江省教育厅科研项目(Y202352687);浙江省教育厅科研项目(Y202352066);温州市基础性科研项目(ZS2023005);温州市基础性科研项目(S2023002);温州市基础性科研项目(S2023003);温州市基础性科研项目(G20240032);

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出版历程
- 收稿日期: 2024-02-19
- 网络出版日期: 2024-10-13

Reverse vacuum preloading method of blown silt foundation overlying backfill soil experimental study

摘要

摘要: 针对传统真空预压加固吹填淤泥地基时，深层土体加固效果不佳和真空压力沿程损失大等问题，提出了反向真空预压法，即采用反向排水板将真空压力直接施加于深层土体。本文通过室内模型试验，探究了回填土厚度对反向真空预压法加固效果的影响。结果表明：与传统真空预压法相比，反向真空预压法处理的排水量增加了16.46%，深层土体十字板剪切强度提高了20.50%，土体的整体加固效果得到显著改善；随着回填土厚度的增大，淤泥层十字板剪切强度沿深度方向递减的幅度明显减小，处理效果更加均匀。此外，通过与传统真空预压法现场对比试验发现，反向真空预压法处理后土体的表层沉降量增大15.70%，深层土体孔压消散量增加了26.20%，平均十字板剪切强度提高了21.12%。因此得出反向真空预压法是一种有效的地基处理方法，尤其深层土体加固效果更优。
- 反向真空预压法 /
- RPVD /
- 回填土
Abstract: In order to solve the problem of poor reinforcement effect of deep soil caused by backfilling when the traditional vacuum preloading is used to strengthen the pumped silt foundation, the reverse vacuum preloading method is proposed. This method uses the reverse drainage plate to directly apply the vacuum load to the deep soil, which effectively reduces the vacuum pressure loss along the road. Through laboratory model test, the influence of backfill thickness on the reinforcement effect of reverse vacuum preloading method was investigated. The test results show that compared with the traditional vacuum preloading method, the displacement increases by 16.46%, the average cross plate shear strength of silt layer increases by 9.60%, and the cross plate shear strength of deep soil increases by 20.50%, and the overall reinforcement effect of soil is significantly improved. With the increase of the backfill thickness, the shear strength of the cross plate of silt layer decreases significantly along the depth direction, and the treatment effect is more uniform. In addition, the field comparison test between the reverse vacuum preloading method and the traditional vacuum preloading method found that the surface settlement of the soil increased by 15.70% after the reverse vacuum preloading method, the pore pressure dissipation value at the depth of 12m increased by 26.20%, and the average shear strength of the cross plate increased by 21.12%. The reverse vacuum preloading method can improve the soil reinforcement effect and solve the problem of poor reinforcement effect in deep soil effectively.
- reverse vacuum preloading method /
- RPVD /
- backfill

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