| 横-竖立体加筋地基中附加应力的分析计算 |
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| 引用本文： | 侯 娟,张孟喜,张陶陶,戴治恒.横-竖立体加筋地基中附加应力的分析计算[J].岩土力学,2015,36(Z2):702-708. |
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| 作者姓名： | 侯 娟 张孟喜 张陶陶 戴治恒 |
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| 作者单位： | 1. 上海大学 理学院，上海 200444；2. 上海大学 土木工程系，上海 200072；3. 上海三益建筑设计有限公司，上海 200040 |
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| 基金项目： | 国家自然科学基金（No.41202215；No.41372280）。 |
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| 摘 要： | 建立了横-竖立体加筋（H-V筋）地基的有限元模型，通过分析地基中的竖向应力分布、水平向位移分布以及筋-土界面相互作用，发现横-竖立体加筋地基中的竖向应力在筋材下方出现扩散和重分布，并逐渐向土体下部传递，使得土体中整体的应力分布更加均匀；同时，横-竖筋材中的竖筋类似于一个侧壁，其提供的垂直侧向力约束了介于竖筋间的土体，限制了土体的侧向水平位移，使得地基中筋材上部土体的侧向水平位移变小。基于有限元模拟对横-竖立体加筋地基加固机制的认识，将横-竖立体筋视为作用在地基上的一维弹性地基梁，通过弹性地基梁理论，根据弗拉曼解推导求解了横-竖立体加筋地基中任意一点竖向附加应力的计算表达式。将模型计算结果与有限元模拟所得结果进行对比发现两者吻合良好。
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| 关 键 词： | 横-竖立体筋（H-V筋） 地基 弹性地基梁 竖向附加应力 |
| 收稿时间： | 2014-12-10 |
Vertical stress analysis and calculations in horizontal-vertical reinforced foundation |
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| HOU Juan,ZHANG Meng-xi,ZHANG Tao-tao,DAI Zhi-heng.Vertical stress analysis and calculations in horizontal-vertical reinforced foundation[J].Rock and Soil Mechanics,2015,36(Z2):702-708. |
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| Authors: | HOU Juan ZHANG Meng-xi ZHANG Tao-tao DAI Zhi-heng |
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| Institution: | 1. College of Sciences, Shanghai University, Shanghai 200444, China; 2. Department of Civil Engineering, Shanghai University, Shanghai 200072, China;
3. Shanghai Sunyat Architectural Design Co., Ltd., Shanghai 200040, China |
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| Abstract: | This paper aims at investigating the potential benefits of using new generation of reinforcement, horizontal-vertical reinforcement(H-V), to improve the bearing capacity and reduce the settlement of shallow foundations on soils. Finite element simulations of model tests were carried out to develop an understanding of influences of horizontal-vertical reinforcement on the bearing capacity, settlement, stress distribution, lateral displacement and the friction on the surface of reinforcement in horizontal-vertical reinforced soil foundation. Load-settlement response of strip footings on horizontal-vertical reinforced sand beds obtained from the numerical simulations are compared with the corresponding experimental results and the match is found to be good. The numerical simulation results show that the inclusion of horizontal-vertical reinforcement will redistribute the applied load to a wider area, thus minimizing stress concentration and achieving a more uniform stress distribution. The redistribution of stresses below the reinforced zone will result in reducing the consolidation settlement of the underlying weak sand soil, which is directly related to the induced stress. It also can be seen that the vertical inclusions of H-V reinforcement offer a strong passive resistance in the vicinity of the load, which prevents the sand particles from moving and rotating. Thus, it can be concluded that beside the tension membrane reinforcement mechanism, the vertical elements of horizontal-vertical inclusions kept the sand from being displaced under the applied load and redistributed the surcharge over a wider area. The horizontal-vertical reinforced base acts as a mattress to restrain the soil from moving upward/downward outside the loading area, redistributes the footing load over a wider area, and reduces the settlement, thereby increasing the shear strength of the composite system, which in turn substantially improves the bearing capacity of a sand bed reinforced with horizontal-vertical inclusions. In addition, failure mechanisms for horizontal-vertical reinforced soil foundations are proposed based on the finite element simulations and the results of experimental study on model footing tests conducted by the authors. Based on the beam on elastic foundation theory, vertical stress formulas that incorporate the contribution of reinforcements are then developed for horizontal-vertical reinforced foundations. The parameters such as the width, the length and the total depth of horizontal-vertical reinforcement were investigated. The predicted vertical stress values are compared with the results of finite element simulation on horizontal-vertical reinforced foundation. Good agreement is observed. |
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| Keywords: | horizontal-vertical reinforcement(H-V) foundation beam on elastic foundation vertical stress |
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