การวิเคราะห์โครงสร้างถนนที่มีดินซีเมนต์ที่แตกเป็นพื้นทางและรองพื้นทาง. เล่ม 1, เล่ม 2

Analysis of pavement containing cracked soil-cement base and soil-cement subbase

Name: ศิริพงษ์ ทรงศิริ

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Cracked Soil-Cement Pavement

; Flexible Pavement

; โครงสร้างชั้นดินซีเมนต์ที่แตก

; โครงสร้างชั้นทางหยุ่นตัว

Abstract: Since the past up to the present time, the Department ofHighways has still used the empirical method in flexible pavementdesign. This design method is based on the past experience. Thisdesign method has a number of limitations, namely, the weight oftruck and the material must not be differed from the past design.Today it is commonly found that flexible pavement failed before itsdesign life. This might be due to the quality of the pavementmaterials is lower than it should be, or the actual truck load isgreater than the design are specified in the manual. It will beseen that flexible pavement design following the empirical methodtends to be unreliable especially for the road carrying very heavytruck.As a result the road authorities in many countries as wellas the Department of Highways in Thailand started to change toempirical design method to analytical design method. The analyticaldesign method has the advantage over the empirical design method bycompensating with some handicaps. The must important advantage isthat the analytical design enables the pavement engineer calculatingthe stress, strain and deflection in all layers of the pavementstructure. Thus, the pavement engineer can understand theperformance of the pavement under the wheel load much better.The major cause of discrepancy between the empirical designand the analytical design is the traffic volume and the truck weightthat have been considerably increased from the beginning. Bothtraffic volume and truck weight tend to cause the movement of theunbound granular base and subbase courses. The traffic volume andtruck weight will induce the radial tensile strain underneath bothlayers of the pavement, thus causing rutting and cracking on theroad surface, As a result the road will fail in short time afteropen to traffic. So the Department of Highways introduces thesoil-cement to replace the unbound granular base and subbase in theheavy traffic road because it can withstand higher radial tensilestrain than the granular layers. Soil-cement is usually employed inthe Northeastern Thailand because of the scarcity of the rodesources in this region.However reflected crack is generally formed in thesoil-cement road. The width of the crack depends on a number offactors. In this study the stress, strain and deflection of someselected 25 routes are investigated by the analytical designapproach. The base cause of all routes is cracked soil-cement.Their subbase cause is also soil-cement. Truck weights under thisinvestigation program are 21, 23 and 25 tons. Subgrade CBR variesfrom 2 to 10, and the average daily traffic (ADT) from 800 to 10,500vehicles per day.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

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

Name: ดร. ธีระชาติ รื่นไกรฤกษ์

Role: อาจารย์ที่ปรึกษา

Created: 2534

Issued: 2005-04-15

Modified: 2006-05-31

วิทยานิพนธ์/Thesis

ISBN: 9748157483

CallNumber: CVE425

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมโยธา

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	CVE425.pdf	74.73 MB	119	2024-02-22 14:08:51
2	CVE425ab.pdf	126.26 KB	30	2023-12-07 15:37:46
3	CVE425ab.smi	2.99 KB	16	2023-12-07 15:38:33

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