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Research Article

Evaluation of Field Applicability of Slope of Improved Soil for Ground Stabilizer

지반안정재 개량토의 토사 비탈면 현장 적용성 평가

Kang-Il Lee1*
,
Seong-Bak Park2
,
Min-Ju Choi3
이 강일1*
,
박 성백2
,
최 민주3
1Member, Professor, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
2Member, Ph.D. Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
3Member, Ph.D. Candidate, Dept. of Civil Engineering, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
*Corresponding Author
30 March 2021. pp. 35-44
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Abstract

This research studies the stabilization method for improved soil sloped through the on-site application of Paper Flyash ground stabilizers. The target strength required for improved soil is 500kPa, and the compressive strength for the slope surface needs to be less than 1,000kPa after the improvement in order to plant vegetation. To meet this condition, we mixed soil from the site and the ground stabilization material, which is the main material for surface improvement material, performed mixing design and conducted various tests including strength test, permeability test and plantation test. After analyzing the results of the compression test on improved soil slope, we proposed soil constants for the improved soil. In order to evaluate the applicability of the improved soil on the slope, the site construction was carried out on the collapsed slope and the reinforcement evaluation of the surface of the improvement soil was conducted. The stability was not secured before the reinforcement, but the test shows after the reinforcement with improved soil, the safety rate is secured up to 48 hours during the raining period. In addition, the compressive strength of the improved soil at the site was secured at more than 200kPa adhesion as planned, and the soil hardness test result was also found to be within the specified value of 18-23mm, which increased the resistance to rainfall and ability to grow plant on the surface for improved soil.

Keywords
Soil hardness
Germination test
Soil stabilizer
Improved soil
Surface improvement

본 연구는 제지 플라이애시 지반안정재를 활용하여 개량토 토사 비탈면의 현장 적용을 통한 안정화 방법을 연구하였다. 개량토에 요구되는 목표강도는 500kPa이며 토사 비탈면을 개량후 식생이 발아하기 위한 압축강도는 1,000kPa 이하이다. 이 조건을 만족하기 위해 현장에서 반입된 시료를 가지고 표층개량의 주원료인 지반안정재와 혼합하여 배합설계를 거처 강도시험 및 투수시험 그리고 식생 발아시험 등 다양한 시험을 실시 하였다. 그리고 개량토로 시공된 비탈면에 대한 기존 압축시험 결과를 분석한 후 개량토의 지반정수를 제안하였다. 또한 개량토의 비탈면 현장 적용성을 평가하기 위하여 붕괴된 비탈면에 대하여 현장 시공을 실시하여 개량토의 표층부 보강평가를 실시하였다. 그 결과 보강 전에는 안정성을 확보하지 못했지만 개량토로 보강한 이후 안전율은 강우 지속시간 48시간까지 최소 안전율을 확보하는 것으로 나타났다. 그리고 현장 개량토의 압축강도는 설계치인 점착력 200kPa 이상을 확보하고 토양경도계 시험 결과도 규정 값인 18～23mm 이내로 확인되어 개량토 비탈면의 경우 강우에 저항성이 증대되고 표층부의 식물생육이 가능한 것으로 나타났다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 20
  • No :1
  • Pages :35-44
  • Received Date : 2021-02-03
  • Revised Date : 2021-03-10
  • Accepted Date : 2021-03-10
  • DOI :https://doi.org/10.12814/jkgss.2021.20.1.035
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