GUO J Q, YANG H N, WANG J Y, et al.Calculation method and influencing factors analysis of open-loop pressure of sleeve valve pipe grouting based on thick-walled cylinder theory[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(5):173-182.

doi:10.16186/j.cnki.1673-9787.2023050019

Received:2023/05/12

Revised:2023/08/03

Published:2024/07/31

Calculation method and influencing factors analysis of open-loop pressure of sleeve valve pipe grouting based on thick-walled cylinder theory

GUO Jiaqi1, YANG Haonan1, WANG Jianye2, XU Pengfei2, FENG Xiaojiang2

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Communications Construction Company of CSCEC 7th Division Crop，Ltd.，Zhengzhou  450004，Henan，China

Abstract: Objectives Sleeve valve pipe grouting technology has been widely used in various engineering fields， such as stratum reinforcement， subgrade disease control， and subway station leakage treatment， etc. However， the issue of determining the open-loop pressure of sleeve valve pipe grouting has not been effectively solved. To address this issue，  Methods based on the thick-walled cylinder theory model， a method for calculating the formation stress at the outlet of the sleeve valve pipe under arbitrary inclination was proposed. Combined with the fourth strength criterion， the theoretical calculation formula for the open-loop pressure of sleeve valve pipe grouting was established， considering the comprehensive influence of multiple factors. The influencing factors of open-loop pressure were analyzed. Results The results show that the open-loop pressure of sleeve valve pipe grouting increases with the increase of compressive strength of the casing material， the ratio of Poisson’s ratio of the casing material to soil， grouting depth， and the ratio of minimum to maximum horizontal principal stress. Conversely， it decreases with the increase in the inner to outer radius ratio of the casing material and the ratio of the elastic modulus of the casing material to soil. The compressive strength of the casing material， the inner to outer radius ratio of the casing material， and the grouting depth have a more significant influence on the open-loop pressure than other factors. The direction of the grouting hole also significantly influences the open-loop pressure： when α is constant， the open-loop pressure decreases with the increase of β， and when β is constant， the open-loop pressure increases with the increase of α.  Conclusions The formula for calculating the open-loop pressure of sleeve valve pipe grouting was applied to the new construction of the DK107+105 frame ejection culvert project from north Daye to Yangxin Railway and compared with the existing methods. The results show that the open-loop pre-ssure calculated by this method is closer to the field measurement range and superior to existing methods. The research findings can provide support for the theoretical development and field application of sleeve valve pipe grouting.

Key words:sleeve valve pipe grouting;casing material;thick-walled cylinder theory;open-loop pressure