LIU Lin,LIU Yong,WANG Shu-ren.An Eliminating Method of Over-excavated Holes in Pipe-jacking Construction of Utility Tunnel with Rectangular Cross-section in Gravel Stratum[J].China Water & Wastewater,2021,37(10 10):154-159.
An Eliminating Method of Over-excavated Holes in Pipe-jacking Construction of Utility Tunnel with Rectangular Cross-section in Gravel Stratum
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
10 10
Page:
154-159
Column:
Date of publication:
2021-05-17
- Keywords:
- gravel stratum; utility tunnel; rectangular pipe jacking; over-excavated holes; soil modified mud
- Abstract:
- A rectangular cross-section utility tunnel which cross a main road in Baotou is located in a complex sand gravel stratum, and large underground over-excavated holes appear at the initial construction stage by pipe-jacking construction. Based on field investigation and analysis of construction parameters, three main reasons including the clogging of pressure gauge by sand gravel, the loss of anti-friction mud in soil and the inapplicability of modified mud mix ratio are found by means of cause correlation analysis. By comparison, corresponding measures are taken, such as adding whole section earth pressure monitoring system to the pipe jacking equipment, injecting thick mud into the external pipe sockets by mud injection equipment to form a impermeable “mud shell”, and adjusting the mix ratio of bentonite mud. The underground over-excavated holes have been eliminated in the subsequent pipe-jacking construction process successfully, and the field observation results of soil settlement have met the requirements.
Last Update:
2021-05-17