Mesostructural change of soil-rock mixtures based on NMR technology

FENG Shang-xin; CHAI Jun-rui; XU Zeng-guang; QIN Yuan; CHEN Xi

doi:10.16285/j.rsm.2016.2545

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Mesostructural change of soil-rock mixtures based on NMR technology

更新时间：2026-06-25

- Mesostructural change of soil-rock mixtures based on NMR technology
- Vol. 39, Issue 8, Pages: 2886-2894(2018)
- 作者机构：
  
  西安理工大学西北旱区生态水利国家工程国家重点实验室培育基地,陕西,西安,710048
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.2545
  CLC： TU458
- Online First：02 September 2018，
  
  Published：2018
- 稿件说明：
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FENG Shang-xin, CHAI Jun-rui, XU Zeng-guang, et al. Mesostructural change of soil-rock mixtures based on NMR technology[J]. 2018, 39(8): 2886-2894.
DOI：

FENG Shang-xin, CHAI Jun-rui, XU Zeng-guang, et al. Mesostructural change of soil-rock mixtures based on NMR technology[J]. 2018, 39(8): 2886-2894. DOI： 10.16285/j.rsm.2016.2545.

摘要

为研究土石混合体在渗流作用下细观结构的变化。选取土石比例为7:3的重塑土石混合体试样进行室内渗流试验，采用核磁共振（NMR）实时监测试样在不同水力坡降和不同时间段下的细观结构信息，如孔隙分布和自由水孔隙等。结果表明：（1）渗透压力变化导致土石混合体孔隙分布发生改变，促使孔隙扩大及孔隙连通性变好，并破坏土石混合体结构特性等；（2）随着水力坡降和时间的增加，自由水孔隙、总孔隙及NMR渗透率均有不同程度增长，NMR渗透率增长速率持续升高，且自由水孔隙在对NMR渗透率贡献上大于束缚水孔隙；（3）低水力坡降下土石混合体孔隙分布曲线的不均匀系数Kua和曲率系数Kca系数变化较小，土石混合体侵蚀程度小，渗透破坏程度低。高水力坡降下Kua和Kca系数变化明显，土石混合体侵蚀程度较高，土石混合体形成渗流通道并发生渗透破坏。

Abstract

To research the effect of seepage on mesostructural change of soil-rock mixtures

a laboratory seepage test was applied on soil-rock mixtures with the ratio of 7:3. Nuclear magnetic resonance (NMR) analysis system was applied to monitor the mesostructure change of soil-rock mixtures under different hydraulic gradients and different time periods

such as pore distribution

movable fluid porosity

etc. According to NMR results

it was found that: 1) Seepage pressure caused change of soil-rock mixture properties such as pore distribution

pore size and pore connectivity

which can damage structural characteristics of soil-rock mixtures. 2) With the increase of hydraulic gradient and time

porosity

mobile fluid porosity and NMR permeability all increase

and the NMR permeability growth rate is increased. Besides

mobile fluid porosity has a more significant contribution to permeability than irreducible porosity. 3) Under low hydraulic gradient

the coefficients of Kua and Kca have small change

which reveals low erosion scales and low degree of seepage failure. Under high hydraulic gradient

the coefficients of Kua and Kca have significant change and erosion scales become higher. The soil-rock mixtures form seepage channel and seepage failure.

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