การวิเคราะห์ความคงตัวของถนนคันทางเสริมความคงตัวบนดินอ่อน ที่มีความหนาต่าง ๆ

Stability Analysis of Reinforced Road Embankment on Soft Clay of Variable Layer Thicknesses

Name: สมปาน อาชานัยนันท์

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Road Embankment

; Reinforced Road Embankment

; ถนนคันทาง

; ถนนคันทางเสริมความคงตัวบนดินเหนียวอ่อน

Abstract: This thesis investigates about the stability of reinforced roadembankment on soft clay in Thailand that utilizes polymeric geotextiles orgeogrids to reinforce the embankment for adequate safety. Program STABGM inMS-DOS system has been used to analyze safety factor of the reinforced roadembankment and program SLOPE/W in Microsoft Windows system has been usedto compare with the STABGM. The data to be analyzed has been set at the roadembankment height = 1.5 to 3.0 m., the soft clay thickness = 4 to 10 m., thenundrained shear strength = 0.7 to 1.4 t/mL, the unit weight of road embankmentmaterial and soft clay = 2.2 and 1.4 t/m3, respectively, and the friction angle ofroad embankment material = 30 degree. All the set data tend to simulate theactual works in Thailand. The reinforcement will be placed at the roadembankment base and with a strength increasement 2 t/m. until the programscould not analyze, and that is a the peak of reinforcement analysis. All the resultsof STABGM have been used to study on characteristics of the reinforced roadembankment and to find the factors which affect the efficiency of reinforcement(The efficiency of reinforcement = increasement of safety factor per applied force)Lastly the results are compared to the analysis made by program SLOPE/W.The results of STABGM analysis indicate that the reinforced roadembankment will fail in midpoint circle type or majority of failure circle centersthat give the lowest safety factor are on the vertical line which passes the midpointof the road embankment side slope but the position of failure circle centers willmove down with an increase of reinforcement. When the failure circle centersmove to the top surface of embankment, this will correspond to the maximumreinforcement that can be analyzed by the program. The factors which affect theefficiency of reinforcement are the strength of the reinforcement, soft claythickness and embankment height. All these factors increase will decrease theefficiency of reinforcement. On the other factor, an increase of the undrained shearstrength has very low affect to the efficiency of reinforcement. An increase offactors tends to increase the maximum reinforcement, except the embankmentheight increase has no affect. In comparison to the SLOPE/W, the results ofSTABGM give lower efficiency of reinforcement and are closer to theory thanSLOPE/W so the results derived from STABGM can be used for design. Theincrease of amounts of reinforcement has safety factor limit, so safety factor of theunreinforced road embankment should be around 1.0. And as the soft clay has verylow value of undrained shear strength, so it is necessary to employ the reinforcedroad embankment and soft clay improvement to get a good and safe road for along time.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: ศ.ดร. ธีระชาติ รื่นไกรฤกษ์

Role: อาจารย์ที่ปรึกษา

Name: รศ. เกษม เพชรเกตุ

Role: อาจารย์ที่ปรึกษา

Created: 2538

Issued: 2005-04-18

Modified: 2006-05-30

ISBN: 9746216368

CallNumber: CVE685

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมโยธา

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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