| 成层软土地基预固结处理后桩基水平承载力估算方法 |
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| 引用本文： | 黄朝煊,袁文喜,胡国杰.成层软土地基预固结处理后桩基水平承载力估算方法[J].岩土力学,2021(1):113-124,134. |
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| 作者姓名： | 黄朝煊 袁文喜 胡国杰 |
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| 作者单位： | ;1.浙江省水利水电勘测设计院;2.中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室青藏高原冰冻圈观测研究站 |
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| 基金项目： | 浙江省基础公益研究计划项目(No.LGF18E090004);浙江省水利厅科技计划项目(No.RC1701);浙江省水利水电勘测设计院科标业项目资助(No.B1803)。 |
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| 摘 要： | 目前通过对软土地基预加固处理来提高桩基水平承载力已被工程界认可,但如何在工程前期设计过程中估算软土地基预处理后桩基水平承载力提高值仍是技术难点。基于此,参考Bowles1]的地基土水平抗力计算式,同时考虑成层软土地基预排水固结处理影响,通过数学推导,推求出根据原状软土室内土工试验抗剪强度指标及预加固处理时间,估算软土地基预处理后桩基水平承载力提高值的实用计算方法。考虑桩侧土弹塑性屈服影响,推导出成层软土中水平受荷桩弹塑性解析解及塑性区深度的计算式,给出了桩顶水平位移、桩身最大弯矩的无量纲计算式及相关计算源代码。依托于浙江省某水闸桩基工程案例,根据提出的计算方法对桩基水平承载力、桩顶水平位移及桩身最大弯矩等性状进行预估计算,并与地基预处理前、后现场试桩检测值进行验证对比,认为桩基水平承载力、桩顶水平位移及桩身最大弯矩等预估计算成果与工程现场试桩的检测值较接近,对类似工程设计具有较好的参考价值。
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| 关 键 词： | 地基预加固处理 桩基水平承载力 水平抗力 幂级数解法 屈服位移 抗剪强度指标 解析解 |
An estimation method of horizontal bearing capacity of piles after pre-consolidation treatment for layered soft foundation |
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| HUANG Chao-xuan,YUAN Wen-xi,HU Guo-jie.An estimation method of horizontal bearing capacity of piles after pre-consolidation treatment for layered soft foundation[J].Rock and Soil Mechanics,2021(1):113-124,134. |
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| Authors: | HUANG Chao-xuan YUAN Wen-xi HU Guo-jie |
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| Institution: | (Zhejiang Design Institute of Water Conservancy and Hydroelectric Power,Hangzhou,Zhejiang 310002,China;Cryosphere Research Station on Qinghai-Xizang Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China) |
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| Abstract: | At present, the improvement of the horizontal bearing capacity of the piles by pre-consolidation of the soft soil foundation has been well recognized by practising engineers. However, how to estimate the increment of horizontal bearing capacity of piles during the pre-engineering process is still difficult. In this article, a practical calculation method for estimating the increment of horizontal bearing capacity of piles is established based on the Bowles1] method and by considering the impact of pre-drainage and pre-consolidation treatment of the layered soft soil foundation. This method provides an effective way to calculate the shear strength index and pre-consolidation treatment time based on the shear strength of undisturbed soft soil by laboratory test. Meanwhile, the elastoplastic solution of the horizontally loaded pile and the calculation formula of the plastic zone depth of layered soft soil foundation are analytically derived, based on the influence of elastoplastic yielding of soils surrounding the pile. In addition, the source code for computing the horizontal displacement of the pile top and the maximum bending moment of the pile body are given. Finally, the horizontal displacement, bearing capacity and the maximum bending moment of piles in the sluice pile foundation engineering case in Zhejiang Province are calculated according to the proposed method. The results of the field tests before and after the pre-consolidation treatments are compared. It is found that the estimated results are close to the test results, which may provide a good reference for similar engineering designs. |
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| Keywords: | pre-consolidation treatment horizontal bearing capacity of pile foundation horizontal resistance power series solution method yield displacement shear strength index analytical solution |
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