考虑泥皮厚度的红层泥岩桩基承载力计算公式修正
发布时间：2018-11-13 15:12
【摘要】：通过室内桩-岩剪切试验、数值模拟及桩基模型试验,研究了泥皮厚度对红层泥岩桩基承载力的影响,提出了不同泥皮厚度下的红层泥岩桩基承载力修正系数,对红层泥岩桩基承载力计算公式进行了修正。为建立泥皮作用下的桩-岩接触面本构模型,进行了室内试验并发现:红层泥岩桩-岩接触面力学性状呈现应变软化特征;泥皮存在降低接触面峰残强度,峰值摩擦角和黏聚力分别降低47.7%和53.4%,残余摩擦角和黏聚力分别降低39.5%和34.4%。基于试验结果,建立桩-岩接触面应变软化本构模型,将其植入FLAC3D模拟不同泥皮厚度对桩基承载力的影响,结果表明:桩基承载力随泥皮厚度增加而减小,泥皮厚度超过50 mm时桩-岩相互作用由泥皮自身强度决定。根据计算结果分析桩基承载比与泥皮厚度关系,提出了承载力修正系数。在此基础上设计了一套室内桩基模型试验装置,验证了修正系数的合理性。
[Abstract]:Through indoor pile-rock shear test, numerical simulation and pile foundation model test, the influence of mud thickness on the bearing capacity of red layer mudstone pile foundation is studied, and the correction coefficient of bearing capacity of red layer mudstone pile foundation under different thickness of mud crust is proposed. The formula of bearing capacity of red mudstone pile foundation is modified. In order to establish the constitutive model of pile-rock interface under the action of mud crust, laboratory tests were carried out and it was found that the mechanical properties of the pile-rock interface in red layer showed strain-softening characteristics; The peak residual strength of the contact surface was decreased by 47.7% and 53.4%, respectively, and the residual friction angle and cohesion decreased by 39.5% and 34.4%, respectively. Based on the test results, a strain softening constitutive model of pile-rock interface is established and implanted into FLAC3D to simulate the influence of different thickness of mud skin on the bearing capacity of pile foundation. The results show that the bearing capacity of pile foundation decreases with the increase of mud thickness. The pile-rock interaction is determined by the strength of the mud crust when its thickness exceeds 50 mm. According to the calculation results, the relationship between the bearing ratio of pile foundation and the thickness of mud skin is analyzed, and the correction coefficient of bearing capacity is put forward. On this basis, a set of indoor pile foundation model test device is designed, which verifies the rationality of the correction coefficient.
【作者单位】： 西南石油大学土木工程与建筑学院;四川省蜀通岩土工程公司;
【基金】：国家自然科学基金项目(51574201) 住房和城乡建设部科技计划项目(2014-K3-037) 四川省科技创新苗子工程(2016119) 西南石油大学青年科技创新团队(2015CXTD05)
【分类号】：U443.15
本文编号：2329533
[Abstract]:Through indoor pile-rock shear test, numerical simulation and pile foundation model test, the influence of mud thickness on the bearing capacity of red layer mudstone pile foundation is studied, and the correction coefficient of bearing capacity of red layer mudstone pile foundation under different thickness of mud crust is proposed. The formula of bearing capacity of red mudstone pile foundation is modified. In order to establish the constitutive model of pile-rock interface under the action of mud crust, laboratory tests were carried out and it was found that the mechanical properties of the pile-rock interface in red layer showed strain-softening characteristics; The peak residual strength of the contact surface was decreased by 47.7% and 53.4%, respectively, and the residual friction angle and cohesion decreased by 39.5% and 34.4%, respectively. Based on the test results, a strain softening constitutive model of pile-rock interface is established and implanted into FLAC3D to simulate the influence of different thickness of mud skin on the bearing capacity of pile foundation. The results show that the bearing capacity of pile foundation decreases with the increase of mud thickness. The pile-rock interaction is determined by the strength of the mud crust when its thickness exceeds 50 mm. According to the calculation results, the relationship between the bearing ratio of pile foundation and the thickness of mud skin is analyzed, and the correction coefficient of bearing capacity is put forward. On this basis, a set of indoor pile foundation model test device is designed, which verifies the rationality of the correction coefficient.
【作者单位】： 西南石油大学土木工程与建筑学院;四川省蜀通岩土工程公司;
【基金】：国家自然科学基金项目(51574201) 住房和城乡建设部科技计划项目(2014-K3-037) 四川省科技创新苗子工程(2016119) 西南石油大学青年科技创新团队(2015CXTD05)
【分类号】：U443.15
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