杜甜甜,王俊杰,黄诗渊,等. 击实水泥土Ⅰ型断裂特性试验研究[J]. 水利水运工程学报,2023(6):117-125.. doi: 10.12170/20220609001
引用本文: 杜甜甜,王俊杰,黄诗渊,等. 击实水泥土Ⅰ型断裂特性试验研究[J]. 水利水运工程学报,2023(6):117-125.. doi: 10.12170/20220609001
(DU Tiantian, WANG Junjie, HUANG Shiyuan, et al. Experimental study on mode I fracture characteristics of compacted cement soil[J]. Hydro-Science and Engineering, 2023(6): 117-125. (in Chinese)). doi: 10.12170/20220609001
Citation: (DU Tiantian, WANG Junjie, HUANG Shiyuan, et al. Experimental study on mode I fracture characteristics of compacted cement soil[J]. Hydro-Science and Engineering, 2023(6): 117-125. (in Chinese)). doi: 10.12170/20220609001

击实水泥土Ⅰ型断裂特性试验研究

Experimental study on mode I fracture characteristics of compacted cement soil

  • 摘要: 为研究水泥土断裂性能,采用直裂缝半圆弯曲(NSCB)试样,对水泥土开展I型断裂试验,研究裂缝长度、水泥掺量和养护龄期对水泥土断裂韧度和断裂能的影响。结果表明:(1)在水泥土NSCB试样直径D=150 mm下,裂缝长径比a/R=0.4和0.5比较合理;随着a/R的增大,峰值位移和峰值荷载逐渐减小,断裂韧度呈减小趋势;断裂能与a/R呈二次函数关系;(2)随着水泥掺量的增加,峰值位移逐渐减少,最后趋于水平,而峰值荷载逐渐增大,试样破坏时呈典型的脆性破坏;断裂能与掺量呈二次函数增加关系,断裂韧度与掺量呈线性增加关系;(3)随着养护龄期的增加,峰值荷载与峰值位移逐渐增大;断裂能、断裂韧度均与养护龄期呈二次函数增加关系。与纯黏土相比,水泥土的断裂性能显著增强。

     

    Abstract: In order to study the fracture performance of cement soil, the notched semi-circular bending (NSCB) specimens were used, and the mode I fracture test was carried out. The effects of crack length, cement content and curing age on the fracture toughness and fracture energy of cement-soil were studied. The results show that: (1) When the diameter of the cement-soil NSCB specimen is D=150 mm, the crack length-diameter ratio a/R=0.4 and 0.5 are reasonable; with the increase of a/R, the peak displacement and peak load will gradually decrease, and the fracture toughness shows a trend of decrease. The fracture energy has a quadratic function relationship with a/R; (2) With the increase of cement content, the peak displacement gradually decreases, and finally tends to be horizontal, while the peak load will gradually increase, and at the same time, the sample shows typical brittle failure when it fails; fracture energy and content increase as a quadratic function. Fracture toughness and dosage increase linearly; (3) With the increase of curing age, the peak load and peak displacement gradually increase; fracture energy and fracture toughness increase with curing time as quadratic function. Compared with pure clay, the fracture performance of cement-soil is significantly enhanced.

     

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