贵阳某隐伏横向溶洞地基处理的稳定性分析

张贝贝; 伍廷亮; 王玉松; 晋明超

doi:10.13204/j.gyjzG21032405

贵阳某隐伏横向溶洞地基处理的稳定性分析

doi: 10.13204/j.gyjzG21032405

1. 贵阳学院, 贵阳 550000;
2. 贵州大学, 贵阳 550000;
3. 中铁城建集团第一工程有限公司, 长沙 410205

基金项目:

局部岩溶发育地质条件下桩基施工风险及处理方案研究(KY2018-1)。

2019年度贵阳市科技局-贵阳学院科技专项基金(GYU-KYZ)(2019-2020)CJ-10

贵州省教育厅青年科技人才成长项目(黔教合KY字[2020]079)

详细信息

作者简介:
张贝贝,男,1986年出生,博士,副教授。电子信箱:369226241@qq.com

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出版历程
- 收稿日期: 2021-03-24
- 网络出版日期: 2022-07-25

Stability Analysis on Foundation Treatment for a Transverse Karst Cave in Guiyang

1. Guiyang University, Guiyang 550000, China;
2. Guizhou University, Guiyang 550000, China;
3. The First Engineering Co., Ltd., China Railway Urban Construction Group, Changsha 410205, China

摘要

摘要: 岩溶地基的稳定性是地面建筑安全的重要保证。以贵州南明区某高层建筑的巨型溶洞处理为例,采用结构力学近似法和有限元分析法分析建筑荷载下溶洞顶板稳定性。通过数值模拟软件FLAC^3D建立不同填充材料及填充范围工况的计算模型,计算在建筑荷载下,不同填充材料和填充范围下溶洞顶板及地面的应变场和应力场特征。溶洞的填充材料分别是细石混凝土和碎石,填充范围包括全区域填充和建筑一侧的部分填充。对比分析了4种工况情况下,溶洞上覆地基变形的特征。与试测结果的对比表明:数值计算分析与现场监测数据吻合,复杂溶洞经处理后,在桩基荷载作用下地基稳定;细石混凝土的填充效果比碎石材料效果更佳,在保证建筑安全的基础上,部分填充的方案能为工程节省更多的成本。
- 岩溶处理 /
- 地基 /
- 稳定性 /
- 数值分析
Abstract: The stability of karst foundation is an important guarantee for the safety of ground buildings. Taking an actual engineering of treatment for a giant karst cave under a high-rise building in Guizhou Province as an example, the stability for the roof subjected to building loads was analyzed used by the structural mechanics approximation method and finite element method. By the numerical simulation software FLAC^3D, the calculation models of foundation with karst caves filled with different materials and ranges were constructed to calculate the characteristics of the strain field and stress field in the cave roof and ground under building loads. The materials filled in karst caves were fine aggregate concrete and crushed stone respectively, and the filling ranges included the whole void and the partial void in the side of the building. The deformation characteristics of overlying foundation in four working conditions were compared and analyzed. The results showed that the numerical analysis consonant with the actual monitoring data, and the treated foundation with complex karst cavities was stable under the action of pile loads, and the filling effect of fine aggregate concrete was better than that filled by gravel material. On the basis of ensuring the safety for the building, the partial filling scheme could save more cost for the project.
- treatment for karst cave /
- foundation /
- stability /
- numerical analysis

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