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สัมประสิทธิ์แรงดันดินด้านข้างที่สภาวะอยู่นิ่งของดินเหนียวอ่อนกรุงเทพประกอบตัวใหม่ขณะเพิ่มหน่วยแรงประสิทธิผลในแนวดิ่ง |
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| รหัสดีโอไอ | |
| Creator | ปิยะฉัตร ฉัตรตันใจ |
| Title | สัมประสิทธิ์แรงดันดินด้านข้างที่สภาวะอยู่นิ่งของดินเหนียวอ่อนกรุงเทพประกอบตัวใหม่ขณะเพิ่มหน่วยแรงประสิทธิผลในแนวดิ่ง |
| Contributor | วีรพร พงศ์ติณบุตร พรเกษม จงประดิษฐ์ |
| Publisher | King Mongkut’s University of Technology Thonburi |
| Publication Year | 2565 |
| Journal Title | KMUTT Research and Development Journal |
| Journal Vol. | 45 |
| Journal No. | 1 |
| Page no. | 145-164 |
| Keyword | Coefficient of Earth Pressure at Rest, Lateral Earth Pressure, Soft Bangkok Clay, Automatic Control System |
| URL Website | https://journal.kmutt.ac.th/ |
| Website title | เว็บไซต์วารสารวิจัยและพัฒนา มจธ. |
| ISSN | 2697-5521 |
| Abstract | This research mainly focused on how to determine the coefficient of lateral earth pressure at rest (Ko) for normally consolidated soft Bangkok clay. Traditionally, such a coefficient is determined using a triaxial test equipment. However, the procedures to perform Ko-consolidation via the triaxial test is highly complicated as it is necessary to maintain the vertical strain to be equal to the volumetric strain. The measured value of Ko would be erroneous if such a criterion could not be met. Therefore, a new methodology and artificial equipment are proposed in this research. The experiments were performed by using high precision sensors in combination with an automatic feedback control system that was able to measure stresses in three axes; the set up could reproduce significant boundary conditions in the field. The specimens were consolidated by differential pre-consolidation pressures. The values of Ko were measured at the end of the primary consolidation. The proposed automatic controlling system worked very well to constrain the lateral movement while consolidation was performed. The Ko value did not depend on both pre-consolidation pressures and undrained shear strength. |
