| 初始孔压非均布下一维地基砂垫层优化研究 |
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| 引用本文： | 蒙宇涵,陈征,冯健雪,李红坡,梅国雄.初始孔压非均布下一维地基砂垫层优化研究[J].岩土力学,2019,40(12):4793-4800. |
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| 作者姓名： | 蒙宇涵 陈征 冯健雪 李红坡 梅国雄 |
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| 作者单位： | 1. 广西大学 工程防灾与结构安全教育部重点实验室，广西 南宁 530004；2. 广西大学 广西防灾减灾与工程安全重点实验室，广西 南宁 530004；
3. 广西大学 土木工程学院，广西 南宁 530004；4. 武汉大学 水工岩石力学教育部重点实验室，湖北 武汉 430072；
5. 贵州民族大学 建筑工程学院，贵州 贵阳 550025 |
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| 基金项目： | 国家自然科学基金（No.51578164，No.41672296，No.51878185）；广西自然科学基金创新研究团队项目（No.2016GXNSFGA380008）；长江学者（No.T2014273）；八桂学者（No.2016A31）；中国国家留学基金（No.201906660001）。 |
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| 摘 要： | 针对吹填土地基水平排水砂垫层铺设深度优化问题，建立了初始孔压非均布下含砂垫层地基的一维固结模型，利用有限Fourier正弦变换法得出了超静孔压和地基整体平均固结度的解答并通过退化验证了解答的正确性。采用二分法分析了砂垫层的最优铺设深度随时间的演化规律，给出了砂垫层最优铺设深度与时间的关系图。研究表明：在固结初期，砂垫层宜放置在土中初始超静孔压较大的位置；在固结后期，砂垫层的最优设置深度为土体厚度的2/3（单面排水）或者1/2（双面排水）的位置。以预压地基平均固结度达到90%所需时间最短为例，当初始孔压倒三角形、正三角形与梯形分布时，单面排水条件下，应分别在0.52、0.72、0.62倍地基土深度处设置砂垫层；双面排水条件下，应分别在0.42、0.58、0.46倍地基土深度处设置砂垫层。最后通过算例分析了当地基土中砂垫层采用最优铺设深度时，与在中间位置铺设砂垫层、不设砂垫层的情况分别进行对比，当时间因子取0.09时，地基土平均固结度分别提高6%和54%。
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| 关 键 词： | 一维固结 解析解 砂垫层铺设深度优化 初始孔压非均布 |
| 收稿时间： | 2018-10-12 |
Optimization of one-dimensional foundation with sand blankets under the non-uniform distribution of initial excess pore water pressure |
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| MENG Yu-han,CHEN Zheng,FENG Jian-xue,LI Hong-po,MEI Guo-xiong.Optimization of one-dimensional foundation with sand blankets under the non-uniform distribution of initial excess pore water pressure[J].Rock and Soil Mechanics,2019,40(12):4793-4800. |
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| Authors: | MENG Yu-han CHEN Zheng FENG Jian-xue LI Hong-po MEI Guo-xiong |
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| Abstract: | Aiming at the optimal installation of horizontal drainage channels in hydraulic fill reclamation projects, one dimensional consolidation model with drainage channels installed in the foundation which considering the non-uniform distribution of initial excess pore water pressure was established. The analytical solution was obtained using the finite sine Fourier transform method. After verifying the correctness of the solution, the optimal position of the drainage channels under different time factors was solved and also given in the diagram form. The results show that drainage channels should be installed at the depth of soil layer with great excess pore pressure at the early stage of consolidation, and turn to 2H/3 (PTIB) or H/2 of soil (PTPB) at the later stage of consolidation (H is the depth of foundation). In order to save the consolidation time when the degree of consolidation reaches 90%, the optimal installation depth of horizontal drainage channels was 0.52H, 0.72H, and 0.62H for the single-drainage condition with the distribution of initial excess pore pressure in the inverted triangle, triangle and trapezoidal pattern, respectively. For the double-drainage condition, the optimal installation depth of horizontal drainage channels was 0.42H, 0.58H, and 0.46H, respectively. A practical example shows that the foundation with optimal depth of horizontal drainage channels has higher consolidation degree (6% and 54%) than that with drainage channels installed in 0.5H and without drainage channels installed. |
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| Keywords: | one-dimensional consolidation analytical solution optimal installation of horizontal drainage channels non-uniform distribution of initial excess pore water pressure |
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