一种新型剪应力模型——双曲力学模型

doi:10.13722/j.cnki.jrme.2021.0460

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摘要为了更准确、方便地描述岩土材料的力学行为特征，采用理论分析与试验研究相结合的方法，基于岩土剪切面的破坏机制，将岩土材料抗力划分为广义黏结力和摩擦力。根据黏结力与摩擦力不共步行为特征，引入一个双曲函数描述两者的交替作用，以莫尔–库仑强度理论为基础，建立一种新型双曲力学模型，给出模型中4个参数的确定方法及物理意义，按照此模型可以确定岩土材料临界变形值。该模型意义明确，结构简单，可以描述岩土材料的大部分力学行为特征：如弹脆性、理想弹塑性、弹塑性硬化和弹塑性软化材料行为特征，特别能够准确反映材料破坏后区的应变软化特征。最后，通过开展红黏土、红黏土与钢板接触面的剪切试验获得应力、变形数据，利用该试验数据对模型进行验证，得到了比较一致的结果。

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	干飞1
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	叶晓明3
	郑刚2
	雷华阳2
	李美霖1
	肖杨3

关键词 ：土力学, 黏结力, 内摩擦, 交替作用, 双曲函数

Abstract：In order to describe the mechanical behavior of geo-materials accurately and conveniently，the resistance of geotechnical materials is divided into generalized bonding force and friction force based on the failure mechanism of rock and soil shear plane. The method of combining theoretical analysis with experiment is adopted in this paper. A hyperbolic function is proposed to describe the alternative actions of the cohesive force and friction based on their out-of-sync feature. A new type of hyperbolic mechanics model is established based on the Mohr-coulomb strength theory. Physical meaning of the model parameters are discussed as well as their determination method. The critical deformation value of geotechnical material can be estimated by the proposed model. The proposed model has clear meaning and simple structure，and can describe most of the mechanical behavior characteristics of geomaterials，such as elasto-brittle，ideal elasto-plastic，elasto-plastic hardening and elasto-plastic softening material behavior characteristics，especially for the strain softening characteristics of materials after failure. Finally，the stress-deformation data obtained from shear tests on red clay and the contact surface between red clay and steel plate were used to verify the model，and the consistent results were obtained.

Key words： soil mechanics cohesion friction alternation hyperbolic function

引用本文:

干飞1，2，叶晓明3，郑刚2，雷华阳2，李美霖1，肖杨3. 一种新型剪应力模型——双曲力学模型[J]. 岩石力学与工程学报, 2021, 40(S2): 3253-3260.
GAN Fei1，2，YE Xiaoming3，ZHENG Gang2，LEI Huayang2，LI Meilin1，XIAO Yang3. A new type of shear stress model-hyperbolic mechanical model. , 2021, 40(S2): 3253-3260.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0460 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3253

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