烧胀岩改良黄土的基本工程特性试验研究。

Experimental study on basic engineering properties of loess improved by burnt rock.

机构信息

School of Geology and Mining Engineering, Xinjiang University, Urumqi, 830017, China.

School of Resource and Earth Science, China University of Mining & Technology, Xuzhou, 221116, China.

出版信息

Sci Rep. 2023 Jul 7;13(1):11023. doi: 10.1038/s41598-023-38083-z.

DOI:10.1038/s41598-023-38083-z

PMID:37419992

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10328993/

Abstract

Modifying the loess foundation effectively solved the deformation and settlement of the building foundation and improved its stability. However, burnt rock-solid waste was often used as filling material and light aggregate, while there were few studies on the engineering mechanical properties of modified soil. This paper proposed a method of burnt rock solid waste-modified loess. Therefore, we conducted compression-consolidation and direct shear tests on burnt rock solid waste-modified loess under different burnt rock contents to explore its improved loess's deformation and strength characteristics. Then, we used an SEM to investigate the modified loess's micro-structures under different burnt rock contents. The results showed that as the burnt rock-solid waste particle content continued to increase, the void ratio and compressibility coefficient of the samples with different ranges of burnt rock-solid waste particles gradually decreased with rising vertical pressure, while the compressive modulus increased first, then reduced and then increased with the increase of vertical pressure; the shear strength indexes all showed an increasing trend with the increased content of burnt rock-solid waste particles; when the content of burnt rock-solid waste particles was 50%, the compressibility of mixed soil was the lowest, the shear strength was the largest, and the compaction effect and shear resistance were the best. However, when the content of burnt rock particles was 10-20%, the shear strength of the soil improved significantly within the content range. The mechanism of burnt rock-solid waste to enhance the strength of the loess structure was mainly to reduce the porosity and average area of soil, significantly improve the strength and stability of mixed soil particles, and thus significantly improve the mechanical properties of soil. The results of this research will provide technical support for safe engineering construction and geological disaster prevention and control in loess areas.

摘要

改性黄土基础能有效解决建筑物基础的变形和沉降问题，提高其稳定性。但是，通常使用烧岩土作为填充材料和轻骨料，而对于改性土的工程力学性能研究较少。本文提出了一种烧岩土改性黄土的方法。因此，我们对不同烧岩土含量下的烧岩土改性黄土进行了压缩固结和直接剪切试验，以探讨其改良黄土的变形和强度特性。然后，我们使用 SEM 观察了不同烧岩土含量下改性黄土的微观结构。结果表明，随着烧岩土颗粒含量的不断增加，不同粒径范围的试样的孔隙比和压缩系数逐渐减小，而随着竖向压力的增大，压缩模量先增大后减小再增大；剪切强度指标均随烧岩土颗粒含量的增加呈增大趋势；当烧岩土颗粒含量为 50%时，混合土的压缩性最低，剪切强度最大，压实效果和抗剪能力最好。但是，当烧岩土含量为 10-20%时，土的剪切强度在该含量范围内显著提高。烧岩土增强黄土结构强度的机制主要是降低土的孔隙率和平均面积，显著提高混合土颗粒的强度和稳定性，从而显著提高土的力学性能。该研究结果将为黄土地区安全工程建设和地质灾害防治提供技术支持。