Load transfer in drilled piles for concrete-rock interface with similar triangular asperities
Load transfer in drilled piles for concrete-rock interface with similar triangular asperities
复制标题
具有类似三角形粗糙度的混凝土-岩石界面钻孔桩中的荷载传递
DOI：
10.1016/j.ijrmms.2019.06.003
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发表时间：
2019-08
影响因子：
7.2
通讯作者：
Minghua Zhao
中科院分区：
文献类型：
--
作者：
Heng Zhao;Shuai Zhou;Minghua Zhao
对于岩层中的钻孔桩，轴向载荷-变形响应的预测可为初步设计提供指导。在此开发中，插座壁的轮廓将被理想化为类似的三角形粗糙体，并且在恒定法向刚度条件（CNS）下，轴的膨胀被横向限制在插座壁上。侧剪切阻力来自于凹凸体的覆盖（扩张）和退化（剪切），并且凹凸体的退化是异步发展的。特别地，通过包括粗糙体的简化退化标准，导出粗糙体几何特性和整体强度之间的相关性。所提出的模型可以被认为是巴顿模型的推广，将规则三角形粗糙体的情况扩展到类似的情况。在此基础上，可以利用预测的相对于位移的剪切动员来更新载荷传递函数。该问题的半解析解已通过有限差分格式进行。基于案例研究的验证，所提出的预测相对于现场观察表现出一般的准确性。为了研究粗糙体倾角对极限强度和残余强度的影响，随后还进行了参数研究。与现有方法相比，所提出的模型的预测捕获了延性响应并描绘了显着的非线性行为。
For drilled piles in rock stratum, predictions of axial load-deformation response offer guidance for the preliminary design. In this development, the profiles of socket wall would be idealized as similar triangular asperities, and the expansion of the shaft is laterally confined across the socket wall under constant normal stiffness conditions (CNS). The side shear resistance contributes from the overriding (dilation) and degradation (shearing) of asperities, and the degradation of asperities develops asynchronously. In particular, a correlation is derived between asperity geometry properties and the global strength by including a simplified degradation criterion of the asperity. The proposed model can be considered as a generalization of Patton's model, extending the case of regular triangular asperities to the similar ones. On this basis, the predicted shear mobilization relative to displacement can then be employed to update the load transfer function. Semi-analytical solutions to this problem have been conducted by a finite-difference scheme. Based on the validation of a case study, the proposed prediction exhibits general accuracy with reference to the field observations. To investigate the effect of asperity inclination on the ultimate and residual strengths, a parametric study has also been conducted afterwards. Comparing with an existing method, the prediction from the proposed model captures a ductile response and depicts a notable nonlinear behavior.
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DOI：
10.1061/(asce)em.1943-7889.0000580
发表时间：
2013-11
期刊：
Journal of Engineering Mechanics-asce
影响因子：
--
作者：
Ling Zhang;Ming-hua Zhao;X. Zou
通讯作者：
Ling Zhang;Ming-hua Zhao;X. Zou
影响因子：
2.1
作者：
Adrian F. Williams
通讯作者：
Adrian F. Williams
影响因子：
6.2
作者：
J. P. Seidel;C. Haberfield
通讯作者：
J. P. Seidel;C. Haberfield
影响因子：
5.3
作者：
J. Chin;H. G. Poulus
通讯作者：
J. Chin;H. G. Poulus
DOI：
10.1115/1.3627367
发表时间：
1974
期刊：
--
影响因子：
--
作者：
A. Boresi;Ken Chong;James D. Lee
通讯作者：
A. Boresi;Ken Chong;James D. Lee