Predicting the shear strength parameters of sandstone using genetic programming

Predicting the shear strength parameters of sandstone using genetic programming
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利用遗传编程预测砂岩的抗剪强度参数

DOI:
10.1007/s10064-017-1023-6
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发表时间:
2018-11
影响因子:
4.2
通讯作者:
Jimenez R
Jimenez R
中科院分区:
工程技术3区
文献类型:
--
作者:
Shen J;Jimenez R

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完整岩石的强度,连同岩体结构,可能是岩石工程最重要的性质。为了准确地估算岩石的Mohr-Coulomb(MC)强度参数--粘聚力c和摩擦角θ,必须在不同应力水平下进行三轴试验,以便获得可线性化的破坏包络线。然而,这涉及较高的预算和时间要求,而这些在项目的早期阶段往往是不可能的;因此,已经开发了更快、更便宜的间接方法作为替代。本文利用遗传程序设计(GP)建立了一个预测模型,用于用其它强度指标估算完整砂岩的MC抗剪强度参数。(the单轴抗压强度(UCS)和单轴抗拉强度(UTS)。对GP模型的可靠性进行了评价,并与仅基于UCS或UTS的线性回归模型以及传统的基于三轴的方法进行了比较。Results.show强度估算结果的分析,认为虽然三轴法的估算结果较好,但在缺乏三轴试验数据的情况下,GP模型的预测效果最好,因此,GP模型可用于工程初期或缺乏三轴试验数据的情况下的强度估算. sandstone.at
t The strength of intact rock is, together with the.rock mass structure, probably the most important properties.for rock engineering. To accurately estimate the Mohr–.Coulomb (MC) strength parameters—cohesion c and angle.of friction /—of a rock, triaxial tests must be carried out at.different stress levels so that a failure envelope can be.obtained to be linearized. However, this involves a higher.budget and time requirements that are often not available at.the early stages of a project; thus faster and cheaper indirect.methods have been developed as an alternative. In this.paper, we use genetic programming (GP) to develop a.predictive model to estimate the MC shear strength.parameters of intact sandstone using other strength measures.(the uniaxial compressive strength, UCS, and uniaxial.tensile strength, UTS) under different stress conditions.which shear failure takes place. The reliability of the proposed.GP model is evaluated and compared with alternative.linear regression models based on UCS or UTS only,.and with the traditional triaxial-based approach. Results.show that, although the triaxial method provides the better.estimations, the proposed GP model has the best prediction.performance in the absence of triaxial data, so that it can be.used for practical strength estimations for intact sandstone.at the early stage of projects or when triaxial test data are.not available.
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