| 软土基坑变形失稳形态模拟试验研究 |
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| 引用本文： | 牛富俊,刘玉海,倪万魁. 软土基坑变形失稳形态模拟试验研究[J]. 工程地质学报, 2001, 9(1): 83-99 |
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| 作者姓名： | 牛富俊 刘玉海 倪万魁 |
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| 作者单位： | Cold and Arid Regions Environmental and Engineering Research Inst itute, CAS,;长安大学地质工程系 |
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| 基金项目： | 国土资源部岩土工程开放研究实验室基金资助项目!(项目编号 KF-0 0 5 ) |
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| 摘 要： | 通过不同土性、地下水条件下软土基坑开挖变形失稳的模拟试验, 研究了软土基坑开挖变形发展直至失稳破坏的全过程。通过试验研究, 初步认为软土基坑坑壁在无支护或支护刚度较小的情况下, 其坑壁破坏形态呈抛物线型; 在基坑开挖范围内若存在有砂性土, 且地下水位较高时, 易于发生流砂渗透破坏, 并导致了地表沉陷, 但侧向变形相对较小; 而对于因承压水引起的坑底土体隆起变形, 若不考虑土体的强度特性, 计算结果是偏于安全的。
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| 关 键 词： | 软土 基坑 变形 模拟试验 |
| 收稿时间： | 2000-06-26 |
| 修稿时间： | 2000-06-26 |
EXPERIMENTAL STUDY ON DEFORMATION AND INSTABILITY OF FOUNDATION-P IT IN SOFT SOIL |
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| NIU Fujun,Liu Yuhai,NI Wankui. EXPERIMENTAL STUDY ON DEFORMATION AND INSTABILITY OF FOUNDATION-P IT IN SOFT SOIL[J]. Journal of Engineering Geology, 2001, 9(1): 83-99 |
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| Authors: | NIU Fujun Liu Yuhai NI Wankui |
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| Affiliation: | 1.Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000;2.Chang′an University,Xi′an 710054 |
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| Abstract: | Model experiment on excavation of foundation pit in soft soil with different properties was conducted at different ground water condition. The experiment reveals that in braced or softly braced excavation of pit, the wall develops a relative large deformation before instability occurs. It also shows that the failure plane, which can be fitted with a parabola equation, is different from the usually supposed circular plane; the influence of seepage destruction of the wall on ground subsidence is much serious than that of lateral deflection of the wall. It is essential to consider the mechanical strength of soil in analyzing the base heave caused by the confined ground water, otherwise, the calculated result is unreasonable to some degree. |
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| Keywords: | Soft soils Foundation-pit Deformation Model experiment. |
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