การศึกษาระยะทรุดตัวที่แตกต่างกันระหว่างเสาเข็มดินซีเมนต์และดินบริเวณรอบ ๆ เนื่องจากน้ำหนักภายนอก

The Study of Differential Settlement Between Cement Column and Surrounding Soil due to External Load

Name: สมบัติ แซ่เจียม

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Settlement

; Cement Column

; Embankment Test

; Instruments

Abstract: This thesis studies the monitoring performance of full-scale embankment test. The embankment test sized 12?21 square meters area, 6 meters height and slope 1:1.25 (vertical: horizontal), which was the ground improvement foundation by soil-cement column amount 80 column and reinforced soil in embankment test with hexagonal wire mesh to hold pre-cast concrete facing panel. This area has installed geotechnical instruments both inside and outside includes surface settlement plate, deep settlement point, open standpipe and closed hydraulic piezometer, digitilt vertical inclinometer, digitilt horizontal inclinometer, control stake, strain gauge and wire extensometer for monitoring performance during and after construction. The conclusion obtained from the study in 230 days since the beginning of time construction is as follows. The rate of settlement is relatively high during the construction of embankment test. The maximum settlement occurring at the ground surface in the position instrument no. S5 is 35.83 centimeters, and the maximum difference in the between the soil surrounding without improvement and the settlement of the pile is 6.03 centimeters. From the obtained result, the maximum rate of the settlements at EL. –3.00 and –6.00 meters measured from ground surface occurring in front of the embankment test are equal to 24.61 and 7.47 centimeters and with respect to the total settlement equivalent to 68.69 and 20.85 percents, respectively. Subsequently, the settlement at EL. –3.00 meters is activable while that at EL. –6.00 meters remain stable. The result of the settlement measured from the instrument gives the maximum value in front of thewall and it is reduced as the distance increases due to performance of designed embankment used as the retaining wall. The maximum excess pore water pressure occurring at EL. –3.00 meters decreases as the depth increase. The pore water pressure of dummy area at EL. –3.00 meters had a considerable on the effect change of water table more than those at EL. –6.00 and –8.00 meters, due to the low permeability of clay and short drainage path. The Asaoka ,s graphical method result predicts the settlements similar to those obtained from the data field, which has the different equal to 12.85 percents. The coefficient of vertical consolidation obtained from Asaoka ,s graphical method cv(Field) is equal to 149cv(Lab), predict the settlements of those obtained for unimproved soil that corresponds to the result obtained in the field. Thus, the settlement for the unimproved soil should be greater than that of the improved one with the soil-cement column.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

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

Name: รศ. เกษม เพชรเกตุ

Role: อาจารย์ที่ปรึกษา

Created: 2545

Issued: 2005-10-03

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9749605098

CallNumber: CVE1767

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมโยธา

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

©copyrights มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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