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| 横观各向同性冻土弹性常数及强度预测 | |
| 引用本文： | 王正中,牟声远,牛永红,陈立杰,刘军,刘旭东.横观各向同性冻土弹性常数及强度预测[J].岩土力学,2008,29(Z1):475-480. |
| 作者姓名： | 王正中 牟声远 牛永红 陈立杰 刘军 刘旭东 |
| 作者单位： | 1. 西北农林科技大学,水工程安全与病害防治研究中心,杨凌,712100;中国科学院,冻土工程国家重点实验室,兰州,730000 2. 西北农林科技大学,水工程安全与病害防治研究中心,杨凌,712100 3. 中国科学院,冻土工程国家重点实验室,兰州,730000 |
| 摘 要： | 在分析冻土形成过程及其组构前提下,从冻土细观结构特征出发,将冻土视为由冰层与干硬土层黏结组成的横观各向同性固体介质.根据复合材料力学理论,求出冻土各向同性面内及面外的弹性模量和泊松比;基于Tsai-Wu 准则,预测了横观各向同性冻土的强度.根据实验数据,分析了不同组分对冻土弹性常数及强度的影响.在工程应用中可根据环境温度及土质、系统有无水分补给、温降速度与冻结速率是否同步、冻土受力方向与冻结封面方向的具体情况选用即可,从而大幅降低室内外试验次数.为冻土工程数值计算奠定了基础,为进一步了解冻土力学特性提供了理论依据. |
| 关 键 词： | 横观各向同性 冻土 弹性模量 泊松比 强度准则 |
| 收稿时间： | 2008-07-25 |
Predictions of elastic constants and strength of transverse isotropic frozen soil |
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| WANG Zheng-zhong,MU Sheng-yuan,NIU Yong-hong,CHEN Li-jie,LIU Jun,LIU Xu-dong.Predictions of elastic constants and strength of transverse isotropic frozen soil[J].Rock and Soil Mechanics,2008,29(Z1):475-480. | |
| Authors: | WANG Zheng-zhong MU Sheng-yuan NIU Yong-hong CHEN Li-jie LIU Jun LIU Xu-dong |
| Institution: | 1. Research Center of Water Engineering Safety and Disaster Prevention , Northwest A&F University, Yangling 712100, China; 2. State Key Laboratory of Frozen Soil Engineering, China Academy of Sciences, Lanzhou 730000, China |
| Abstract: | Under the analysis frozen earth forming process and the fabric premise, embarks from the frozen earth viewing carefully structural feature, regards as the transverse view isotropic solid dielectric which the frozen earth is composed of the ice layer and the dry and hard soil layer caking. According to the theory of composite materials mechanics, in outside the frozen earth isotropic surface and the surface elasticity coefficient and the Poisson’s ratio are obtained. Based on the Tsai-Wu criterion, the transverse isotropic frozen soil strength is perdicted. According to the empirical data, the influence of the different components on the frozen soil elastic constant and strength is analyzed. In the project application, according to the ambient temperature and the soil texture, whether there is the system moisture content supplies, the temperature drop speed and the freeze speed whether synchronization, the frozen soil stress direction and the freeze title page direction special details selects then, thus the indoor and outside test number is reduced largely. Has laid the foundation for the frozen soil project numerical calculation, to further understand that the frozen soil mechanics characteristic so as to provide the theoretical basis. |
| Keywords: | transverse isotropy frozen soil Young’s modulus Possion’s ratio strength criterion |
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