Experimental study on the complex contact frictional property of an ultra-long distance large section concrete pipe jacking with the verification of on-site solution of pipe stuck
LI Chao1，ZHONG Zuliang1，2，LIU Xinrong1，2，ZHAO Yanchun3，YANG Qinghui3，HE Guannan1
(1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas，Chongqing University，Chongqing 400045，China；3. China Railway eighteen Bureau Group Tunnel Engineering Co.，Ltd.，Chongqing 401135，China)
Abstract：To reveal the generation mechanism and variation law of friction resistance between the outer wall of a large section of concrete pipe string and the surrounding rock during construction via ultra-long-distance rock pipe jacking，the shear friction behaviors and mechanical mechanism between sandstone and concrete pipe string wall under seven complex contact conditions were investigated through large-scale direct rock shear tests. The results show that the optimal values of the average friction coefficient for all test results are obtained by only considering bentonite slurry contact condition. In the later stage，the average friction coefficients at the contact surface can be higher than the initial values by 50%–70%. Among them，the average friction coefficient for a combination of extra-pipe in-situ debris，bentonite slurry and sand-laden waste slurry reaches a maximum value. The jacking force needed for stuck pipes was predicted based on the test results and the modified empirical formula, which is identical to the field-monitored value. Finally， a temporary intermediate jacking station(TIJS) method for solving the pipe stuck problem was proposed based on the law of jacking force transmission loss. It is pointed out that the focus of reducing in-situ pipe-rock friction resistance should be placed firstly on controlling the extra-pipe sediment to prevent the formation of high-viscosity mixture that leads to an increase in the friction resistance of the pipe wall and a decrease in the effective injection volume of bentonite slurry. Besides，it is also necessary to ensure a sufficient grouting volume outside the pipes.
李 超1，钟祖良1，2，刘新荣1，2，赵彦春3，杨庆辉3，何冠男1. 复杂接触条件下超长距离混凝土顶管–围岩摩擦特性及现场卡管处置验证研究[J]. 岩石力学与工程学报, 2019, 38(6): 1197-1208.
LI Chao1，ZHONG Zuliang1，2，LIU Xinrong1，2，ZHAO Yanchun3，YANG Qinghui3，HE Guannan1. Experimental study on the complex contact frictional property of an ultra-long distance large section concrete pipe jacking with the verification of on-site solution of pipe stuck. , 2019, 38(6): 1197-1208.
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2019, Vol. 38 
