考虑空间滑动面变化的横观各向同性非饱土强度准则研究 English Version
Study on the strength criterion of transversely isotropic unsaturated soil considering the change of spatial sliding surface
-
摘要: 为了科学预测天然地基与大面积填土地基的强度及变形特性，通过理论分析、系统的室内试验等手段，对横观各向同性非饱和重塑黄土的力学特性做了深入系统的研究。首先，基于空间滑动面强度理论，同时考虑成层地基的沉积角度、横观各向同性及非饱和特性，将基质吸力及横观各向同性参数引入Lade-Duncan强度准则，建立了横观各向同性非饱和黄土的强度准则；其次，设计了多种不同应力路径的非饱和三轴及真三轴试验，测定了横观各向同性非饱和黄土三维强度准则中的相关参数；第三，揭示了横观各向同性非饱和重塑黄土的强度、变形及水量变化特性；最后，将本文提出的强度准则与验证试验结果及Lade-Duncan强度准则、Mohr-Coulomb准则进行对比分析，初步验证了基于空间滑动面变化的横观各向同性非饱和黄土强度准则的合理性及适用性。研究成果可为天然成层地基和大面积填土工程的设计提供理论支持和科学依据，对推动非饱和土力学的强度理论研究具有重要意义。Abstract: In order to scientifically predict the strength and deformation characteristics of natural foundations and large-area fill foundations, a comprehensive and systematic study was conducted on the mechanical properties of transversely isotropic unsaturated remolded loess through theoretical analysis and systematic indoor experiments. Firstly, based on the strength theory of spatial sliding surfaces and considering the sedimentation angle, transverse isotropy, and unsaturated characteristics of layered foundations, the matrix suction and transverse isotropy parameters are introduced into the Lade Duncan strength criterion, and the strength criterion for transverse isotropic unsaturated loess is established; Secondly, various unsaturated triaxial and true triaxial tests with different stress paths were designed to determine the relevant parameters in the three-dimensional strength criteria for transversely isotropic unsaturated loess; Thirdly, the strength, deformation, and water content variation characteristics of transversely isotropic unsaturated remolded loess were revealed; Finally, the strength criterion proposed in this article was compared and analyzed with the verification test results, as well as the Lade Duncan strength criterion and Mohr Coulomb criterion, to preliminarily verify the rationality and applicability of the transverse isotropic unsaturated loess strength criterion based on spatial sliding surface variation. The research results can provide theoretical support and scientific basis for the design of natural layered foundations and large-scale fill engineering, and are of great significance for promoting the strength theory research of unsaturated soil mechanics.
计量
- 文章访问数: 11
- HTML全文浏览量: 0
- PDF下载量: 4
下载:
