验证岩土力学行为的弹变塑模型

The Deducted Numerical Model for Geomaterial Inherent Parameters

基于试验数据和归纳法的前提,目前的岩土工程常用弹土体塑性模型结合数值分析结果进行符合工程安全需求的性能设计。归纳法的前提,假设归纳的观念及数据皆正确,以试验范围内的数据,归纳出符合显性趋势结论。但演绎法必须有绝对正确的假说为前提,依据合理的岩土基本定义与原理,符合逻辑的逐步演绎成系统性一致性的数值模型,由模型预测的数值,经归纳法的验证皆必须为真,始可成为理论。期望整合所有归纳法的经验公式,难以形成一致性的理论。而演绎法的模型,具有不是全对、便是全错的特质。本文基于粒间的摩擦力假定,考虑土体动摩擦角的概念:岩土粒间的力学行为模型,皆具有弹变塑3个相时空。结合传统力学试验的方法及数据与设计新的三轴试验方法,提出了一种新的土体弹变塑模型。

Through the experimental data in the context,a conclusion in line with the dominant trend is drawn. However,the deduction theory must be based on precise hypothesis as a precondition,provided that all theorems and principle are true. Besides,numerical models are validated in a logical manner before one can turn into a systemic predicting theory.Expecting conformity of all empirical formula of induction theory,it is far from forming a consistent theory. Deductive theory demonstrates either right or a total wrong outcome. The "numerical modeling of geotechnical interpretation of essential parameters"based on the hypothesis of intergranular friction,derived from the unique nature of dynamic friction angle. One of the deductive conclusions is that the mechanical behavior between particles of rock and soil exhibits "elastic-changingplastic"phases. The existing mechanical behavior of soil model assumes "elastic-plastic"condition,not only contradicts actual phenomena,but affects the conclusion of the experimental data also. After review the traditional test methods and data,this paper proposes a new triaxial test to prove that the mechanical behavior of rock and soil to be "elastic-changingplastic".