不同吸力分布下条形地基极限承载力解答

doi:10.13722/j.cnki.jrme.2017.1391

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摘要基于平面应变条件下非饱和土的抗剪强度统一解，考虑基质吸力及4种分布、中间主应力和基底粗糙程度的综合影响，建立非饱和土条形地基的太沙基极限承载力解答，继而对其进行可比性分析，对比以往模型试验结果、上限法解答和吸应力法解答，验证了所得公式的有效性，最后探讨各参数的影响特性。研究结果表明：入渗深度对I类和II类吸力分布下的地基承载力均有重要影响，且I类吸力分布下影响分4阶段、II类吸力分布下影响分3阶段；低吸力时均布吸力下基质吸力的影响明显大于其他3种吸力分布，高吸力的双重影响使得地基承载力逐渐减小并趋于稳定，且均布吸力下高吸力的影响大于线性和II类吸力分布；地基承载力随中间主应力效应的增加而增大，有效强度参数的提高作用显著，基底粗糙程度的影响不容忽视，同时应区分基质吸力和基底粗糙程度影响的相对强弱。所得结果考虑了多种因素的共同影响，同时对比了不同吸力分布下每个参数的影响差异，可为非饱和土地基承载力确定和基础优化设计提供有益的参考。

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	张常光1
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关键词 ：基础工程, 条形地基, 极限承载力, 吸力分布, 中间主应力, 太沙基理论

Abstract：Formulas of Terzaghi?s ultimate bearing capacity for a strip foundation with different suction distributions were developed based on the unified solution of shear strength for unsaturated soils under plane strain condition. The overall effects of matric suction，four types of suction distribution，intermediate principal stress and roughness of foundation base were taken into account. The formulas were validated through comparison with the model tests，the upper-bound theory and the suction stress method available in the literature. The parametric studies were carried out. It was found that the infiltration depth had an important impact on the bearing capacity of foundations under suction distributions of type I and type II，and the former had four stages while the latter had three stages. The effect of matric suction under uniform suction is more significant than that under other three suction distributions in the low suction range. The dual-effect of high suction makes the bearing capacity to decrease gradually and to stabilize eventually. The effect of high suction under uniform suction is greater than that under linear suction and suction of type II. The bearing capacity of foundations increases with the intermediate principal stress. The strengthening effect of effective strength parameters is obvious. The effect of roughness of foundation base cannot be ignored. Moreover，the difference between the effects of matric suction and roughness of foundation base should be distinguished.

Key words： foundation engineering strip foundation ultimate bearing capacity suction distribution intermediate principal stress Terzaghi?s theory

引用本文:

张常光1，2，晏青1，周菲3，张成林1. 不同吸力分布下条形地基极限承载力解答[J]. 岩石力学与工程学报, 2018, 37(5): 1237-1251.
ZHANG Changguang1，2，YAN Qing1，ZHOU Fei3，ZHANG Chenglin1. Formulas of ultimate bearing capacity for strip foundation on unsaturated soils with different suction distributions. , 2018, 37(5): 1237-1251.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1391 或 http://www.rockmech.org/CN/Y2018/V37/I5/1237

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