开采沉陷区四合木根系抗变形能力分析

Distortion-resistant ability of Tetraena mongolica root at the mining subsidence area

基于煤炭开采沉陷区植物保护的目的,研究了我国一级保护植物、极端耐旱的四合木根系承受土体变形损伤的极限抗拉力、抗拉强度等力学特性.结果表明,不同根径(1～8mm)四合木灌木的最大抗拉力为6～720N;根直径与其最大抗拉力具有线性相关关系,根直径增大时,其最大抗拉力呈增加趋势;而根的抗拉强度与其直径呈负相关关系.根据四合木根系抗变形能力以及沉陷土体拉伸应力发育规律,建立了开采沉陷区土地拉伸变形引起四合木根系损伤的体积量化模型,为定量分析不同开采方式下地表沉陷对四合木根系的损伤强度提供理论基础.

In attempt to protect the Tetraena mongolica in the coal mining subsidence area,the ultimate anti-tension,tensile strength and other mechanical properties of the plant roots dam- aged by deformation of soil were studied. The results show that, the maximum anti-tension val- ue of the root which has linear relationship with its diameter（I--8 mm）, ranging from 6 N to 720 N. The maximum anti-tension value also shows an increasing trend when its diameter in- creases. The tensile strength has a negative correlation with the diameter of the root. Accord- ing to the data of mechanical properties of the root, and the development and distribution of the soil tensile stress in subsidence area,a model for calculating the volume of the destroyed root was developed,which can quantitatively evaluate the root damages caused by different under- ground mining technology.