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A load-transfer function for the side resistance of drilled shafts in soft rock

机译：荷载传递函数，用于软岩中钻轴的侧阻力

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摘要

The shear stress and shear displacement relationship for the rock socket sidewalls is required for the calculation of the drilled shaft butt settlement under the service loads. This paper first introduces a comprehensive database of in situ axial load tests on drilled shafts, anchors and plugs that are embedded in different soft rock formations. The database includes measurements of (i) the initial shear stiffness, (ii) the peak shear stress and (iii) the post-peak reduction in shear stresses for the socket sidewalls. In addition to the load test results, information on soft rock mass mechanical properties and rock socket geometry is also included. It is found that (i) the initial shear stiffness is directly related to the deformation modulus of the soft rock mass and inversely proportional to the rock socket diameter and length, (ii) the mobilized peak shear stress is related to the drained friction angle of the rock mass and normal stress on the socket sidewalls at failure. The rock mass friction angle is related to the rock type and the geological strength index, and the normal stress at failure is directly related to deformation modulus of rock mass and inversely to the product of rock socket length and diameter, and (iii) the post-peak brittleness is related to the soft rock type and the post-peak shear displacement. An empirical framework for the prediction of the load-transfer function for side resistance of sockets in soft sedimentary and fine-grained rock is developed using the load test database introduced herein. The proposed framework accounts for the socket geometrical characteristics, and the rock mass engineering properties. The pre-peak range in the load-transfer function is modeled using a hyperbolic function, and the post-peak range is modeled using a brittleness index to account for the reduction in shear stresses with post-peak displacement. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：岩壁侧壁的剪应力和剪位移关系是在使用载荷下计算井筒对接沉降所需的。本文首先介绍了一个完整的数据库，该数据库对嵌在不同软岩层中的钻探井筒，锚固和堵头进行了现场轴向载荷测试。该数据库包括（i）初始剪切刚度，（ii）峰值剪切应力和（iii）插座侧壁的剪切应力在峰后减小的测量值。除载荷测试结果外，还包括有关软岩体力学特性和嵌岩几何形状的信息。发现（i）初始剪切刚度与软岩体的变形模量直接相关，与岩石承窝直径和长度成反比，（ii）动员峰值剪切应力与混凝土的排水摩擦角相关。破坏时的岩石质量和承窝侧壁上的法向应力。岩体摩擦角与岩石类型和地质强度指标有关，而破坏时的法向应力与岩体的变形模量直接相关，与岩窝长度和直径的乘积成反比，并且峰值脆性与软岩类型和峰值后剪切位移有关。使用本文介绍的载荷测试数据库，开发了用于预测软沉积和细颗粒岩石中承窝侧面阻力的载荷传递函数的经验框架。所提出的框架考虑了承窝的几何特征以及岩体工程特性。使用双曲线函数对载荷传递函数中的峰前范围进行建模，并使用脆性指数对峰后范围进行建模，以解决剪力随峰后位移的降低问题。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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