Effect of water contents and initial crack lengths on mechanical properties and failure modes of pre-cracked compacted clay under uniaxial compression
Effect of water contents and initial crack lengths on mechanical properties and failure modes of pre-cracked compacted clay under uniaxial compression
复制标题
DOI：
10.1016/j.enggeo.2022.106593
复制
发表时间：
2022-03
影响因子：
7.4
通讯作者：
Taiki Shimbo;Chisato Shinzo;Ukyo Uchii;Ryota Itto;Y. Fukumoto
中科院分区：
文献类型：
--
作者：
Taiki Shimbo;Chisato Shinzo;Ukyo Uchii;Ryota Itto;Y. Fukumoto
本研究研究了不同含水量（w）和初始裂纹长度对单轴压缩下预裂压实粘土的力学性能（即无侧限抗压强度（UCS）、变形模量和II型断裂韧性（KIIC））和破坏模式的影响。在这项研究中，44 个完整的试件和 72 个预裂试件具有不同的含水量（18%、23% 和 28%）和初始裂纹长度（45° 处的 0、15 和 20 mm，即最大剪切应力作用在初始裂纹表面的角度）。结果表明，随着初始裂纹长或含水量高，UCS降低。相反，变形模量取决于含水量，而不取决于初始裂纹长度。计算了KIIC。发现它取决于水含量。 KIICvs.wan 和 KIICvs. 之间的经验相关公式获得UCS。此外，压实粘土的破坏模式分为五种类型。在一些试件中，由于剪应力作用下裂纹表面的接触和滑动，从初始裂纹扩展的翼形裂纹消失，并且在破坏时仅观察到二次裂纹。
This study investigated the effect of different water contents (w) and initial crack lengths on the mechanical properties (i.e., the unconfined compressive strength (UCS), deformation modulus, and mode II fracture toughness (KIIC)) and failure modes of pre-cracked compacted clay under uniaxial compression. In this study, 44 intact specimens and 72 pre-cracked specimens with different water contents (18%, 23%, and 28%) and initial crack lengths (0, 15 and 20 mm at 45°, i.e., the angle at which the maximum shear stress acts on the initial crack surface). The results showed that the UCS decreased with a long initial crack or high-water content. In contrast, the deformation modulus depends on water contents, but not on the initial crack length.KIICwas calculated. It was found to depend on the water content. Empirical correlation formulas betweenKIICvs.wandKIICvs. UCS were obtained. Furthermore, the failure modes of the compacted clay were classified into five types. In some specimens, wing cracks propagating from the initial crack disappeared due to contact and gliding of the crack surface by the shear stress, and only secondary cracks were observed at failure.