[논문]불포화 지반재료의 전단강도정수 추정을 위한 간편법

Park, Seong-Wan; Kim, Yong-Rak

불포화 지반재료의 전단강도정수 추정을 위한 간편법
A Simple Approach of Estimating the Shear Strength Parameters for Unsaturated Soil-Aggregate Systems 원문보기

Park, Seong-Wan (Dept. of Civil & Environ. Engrg., Dankook Univ.) , Kim, Yong-Rak (Dept. of Civil Engrg., Texas A&M Univ.)

본 연구에서는 불포화 토질역학 이론에 근거하여 지반재료의 안정처리로 인해 유발되는 전단강도계수의 변화를 추정하는 방법론을 제안하였다. 지반재료의 유효 점착력과 유효 내부마찰각들이 suction측정값들과 일축압축강도 실험결과를 활용하여 추정되었으며, 안정처리제의 사용량에 따른 효과도 비교하였다. 또한 유전상수 측정실험 결과를 통해서 안정처리에 따른 재료의 suction 변화를 알 수 있었으며, 제안된 방법이 불포화 지반재료의 강도정수를 추정할 수 있음을 보여주고 있다.

This paper presents the results of a study that was performed to evaluate fronds of shear strength parameters in stabilization of unbound soil-aggregate systems based on the theory of unsaturated soil mechanics. Two important shear strength parameters, effective cohesion and effective angle of internal friction were estimated by the proposed approach using the results from suction measurements and unconfined compressive strength test. In addition, the effect of different addition rates of stabilizing agent was compared. Due to the stabilization process, an increase in suction potential on engineering properties of geomaterials was observed by using dielectric constant measurements. In conclusion, the results from this study show that the proposed approach can be simply used for predicting shear strength parameters of the stabilized geomaterials.

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문제 정의

The overall goal of this study is to evaluate physical and mechanical properties and to verify the stabilizing mechanism based on sound theory. Various laboratory tests, unconfined compressive strength test, suction measurement using filter paper, and dielectric measurement were performed.

가설 설정

From the application of Lambom's theory to unsaturated soils, the shear strength equation can be represented as a linear function in a twodimensional space as expressed in Fig. 2. The failure envelope is a function of shear stress and effective normal stress, with parameters of effective cohesion, C', and internal friction angle due to net normal stress, defining the envelope.

제안 방법

Based on Lambom's formulation for unsaturated soils and shear strength theory of the Mohr-Coulomb failure envelope, the changes in effective cohesion and effective angle of internal friction with different additive rates and dilution ratios were investigated using unconfined compressive strength data and suction data. For this analysis, matric suction was replaced by total suction due to difficulty in measuring the matric suction of aggregate base materials using filter paper method.
Various laboratory tests, unconfined compressive strength test, suction measurement using filter paper, and dielectric measurement were performed. Based on the results, shear strength theory for unsaturated soils was employed to verify the expected stabilizing mechanisms.
After oven drying of the limestone, each specimen was compacted at the same moisture content (9%), and then each compacted specimen was cured at 40 ℃ for 7 days. Two different curing conditions, sealed and unsealed, were tested to investigate the curing effect on strength. Moisture in sample cannot evaporate under the sealed condition.

대상 데이터

high and 150 mm diameter mold. The testing mold has 1 mm holes drilled at 13 mm spacing around the entire circumference of the cylindrical mold, approximately 6.4-mm from the bottom. Additional 1 mm holes are drilled in the base of the specimen.

이론/모형

Among several methods for the dielectric constant measurement, so-called Tube Suction Test (TST) using a dielectric surface probe was used for this study. The tube suction test can be easily used to measure the moisture condition and the state of bonding of the water within the soil-aggregate system.
In this study, total suction, which is the summation of matric and osmotic suction, was measured because of difficulty in measuring matric suction of aggregate samples. Among various methods for suction measurement, the filter paper method is employed in this study due to its simplicity.
strength data and suction data. For this analysis, matric suction was replaced by total suction due to difficulty in measuring the matric suction of aggregate base materials using filter paper method. Given an estimation of strength (q“), suction(、&), and volumetric moisture content (0), the effective cohesion (C') and the effective angle of internal friction (©') can be calculated geometrically as illustrated in Fig.

성능/효과

6. Total suction values of treated specimens with different additive rates (1.5%, 4%, and 6%) and dilution ratios (4:1, 6:1) were compared with those of untreated specimens. As can be seen in Fig.

후속연구

due to its general basis. However, to further investigate the process of this approach, more detailed verification study should be made.

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불포화 지반재료의 전단강도정수 추정을 위한 간편법
A Simple Approach of Estimating the Shear Strength Parameters for Unsaturated Soil-Aggregate Systems 원문보기

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불포화 지반재료의 전단강도정수 추정을 위한 간편법 A Simple Approach of Estimating the Shear Strength Parameters for Unsaturated Soil-Aggregate Systems 원문보기

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불포화 지반재료의 전단강도정수 추정을 위한 간편법
A Simple Approach of Estimating the Shear Strength Parameters for Unsaturated Soil-Aggregate Systems 원문보기

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