Geotechnical characteristics of the soil cement mixture and settlement analysis for Tan Son Nhat - Binh Loi Outer Ring Road | |
| Author | Bui Minh Tuan |
| Call Number | AIT RSPR no.PME-GEM-12-06 |
| Subject(s) | Soil stabilization--Vietnam--Tan Son Nhat--Binh Loi Outer Ring Road Soil cement Soil-cement construction |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering (Professional) in Geotechnical Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | |
| Abstract | The 13.7 - km long Tan Son Nhat – Binh Loi Outer Ring Road (TBO) expressway , invested by GS Engineering and Construction Corporation (Korea), link ing Tan Son Nhat International Airport to Outer ring road , is expected to help reduce traffic congestion. However, its construction on soft natural soil is a challenge owing to low shear strength and high compressibility of the soil. This study focused on collection and a n alysis of lab and field monitoring data . In addition, some more tests were conducted including Unconfined Compression, falling head permeability and direct shear test s and algebraic measurement to investigation the capacity of the soft ground improved by deep cement - soil mixing (DCM) piles. The uncon fined compressive strength (qu) of the samples found an increase with increasing mixing ratio and the optimal strength at the rat io of 14%, equivalent to 220 kg of cement - per 1 m 3 of soil . The permeability increased 100 times and 17.4 time after 7 and 28 cu ring days , respective ly . The permeability of the soil mixing piles calculated from results of pore water pressure monitoring shows permeability coefficient of soil cement mixture 582 times higher than natural soil . Direct shear result of 5 samples with 14% cement proportion shows undrained shear strength of samples mixed is 16 times higher than natural soil. Cohesion of soil cement mix ture is about 69.2 - 79.6 kN/m 2 , angle of internal friction is about 28 o 57’ - 31 o 15’ . The qu value o f the mixture is affecte d by organic matter, pH and moisture and namely increasing organic content from 1.1 to 7.01% will decrease qu value by 12.5% , increasing soil pH from 6.75 to 7.18 will increase qu value by 35% , and increasing , initial moisture from 74.32 to 84.23% will dec rease qu value at 91 curing day by 24.87% . Settlement of soft ground improved by DCM is only 0.091m to compare with that of untreated clay of 3.39 m . The usage of DCM piles to improve soil ground in the Tan Son Nhat Binh Loi project has advantages such as reinforcing a great soft clay layer, increasing the load bearing capacity of the ground and reducing a significant subsidence. As our calculation, the reinforce d layer helps to loading mainly transmitted to piles and reduces deviations of settlement betwee n ground and columns, making the construction more stable. |
| Year | 2013 |
| Corresponding Series Added Entry | |
| Type | Research Study Project Report (RSPR) |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering and Management (Master Engineering (Professional)) (PME - GEM) |
| Chairperson(s) | Pham Huy Giao |
| Examination Committee(s) | Ho, Seah Tian;Noppadol Phien-wej |
| Scholarship Donor(s) | Nam Khang Consultant JSC, Viet Nam |
| Degree | Research (M. Eng.) - Asian Institute of Technology, 2012 |