变质岩体岩体静力变形模量的估计准则

IF 0.4 Q4 ENGINEERING, MULTIDISCIPLINARY Engineer-Journal of the Institution of Engineers Sri Lanka Pub Date : 2023-09-25 DOI:10.4038/engineer.v56i3.7604
M. N. C. Samarawickrama, U. G. A. Puswewala, H. S. Thilakasiri, K. M. L. A. Udamulla
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引用次数: 0

摘要

探讨了钻孔灌注桩承台设计中岩体静力变形模量(𝑚)的最适经验准则。通过静桩荷载试验数据的反分析,初步估算出原位的𝑚值。其次,根据选定的经验方程,对反分析(𝑚b)估计的岩体变形能力进行统计检验,以确定后者是否适合用于斯里兰卡变质岩地形。通过对桩荷载试验结果的反分析,发现现有的基于完整无侧限抗压强度平方根(φ𝑐)的经验准则适用于弱-贫岩体。对于强-贫岩石,建议采用基于ρ (f)𝑐'的方程,一般情况下,这两个方程都能产生下界和上界解。基于完整变形模量()的方程在强-优岩体中表现较好,而基于 -优岩体中定义的方程(𝑅QD)则较适合于弱-优岩体。最后,通过回归分析,提出了一套新的适用于不同岩体类型的方程,并提出了相应的设计措施。
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Estimation Criteria for Static Rock Mass Deformability Modulus for Rock-Socket Design in Metamorphic Rock Masses
This study investigates the most appropriate empirical criteria to estimate the static rock mass deformability modulus (𝐸𝑚) in the design of rock-sockets in cast-in-situ bored pile construction. The in-situ 𝐸𝑚 values are initially estimated through back analysis of static pile load test data. Secondly, the rock mass deformability estimated from back analysis (𝐸𝑚b) are tested statistically against selected established empirical equations to determine whether the latter are appropriate for use in metamorphic rock terrain of Sri Lanka. It is found that the existing empirical criterion based on the square root of intact unconfined compressive strength (𝜎𝑐) derived from back analysis of pile load test results is appropriate for weak-poor rock masses. For strong-poor rocks, it is recommended to employ the equation based on 𝜎𝑐', and in general the two equations generate lower and upper bound solutions. The equation based on intact deformability modulus (𝐸𝑖) performs well in strong-excellent quality rock masses, while the equations based on 𝐸𝑖 and rock quality designation (𝑅QD) are found to be appropriate for weak-fair to excellent rock masses. Finally, a new set of equations appropriate for different rock mass types have been proposed through regression analysis along with appropriate design measures to be adopted.
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