Abstract The shield construction is a mature tunnel technology. Grouting behind segment wall synchronously during an important measure to control stratum deformation, reduce ground settlement and prevent water seepage. quality of grouting can significantly affect the construction. method judgment in early inefficient uncertain. To ensure safety structure, it urgent technical innovation study no...

this study aims at presenting a numerical model for predicting grout flow and penetration length into the jointed rock mass using universal distinct element code (udec). the numerical model is validated using practical data and analytical method for grouting process. input data for the modeling, including geomechanical parameters along with grout properties, were obtained from a case study. the...

In this study, four types of grout were developed to evaluate the effect of grouting of saturated riprap layers on ground water flow. The developed types of grout are divided into a quick-setting type and a general-type, and also into high and low viscosities. A number of grout tests were performed in a model acrylic chamber, 0.4 m in diameter and 2.0 m in length, for visual observation of inje...

For pump installation most experts recommend installing conventional metallic baseplates on concrete foundations and securing them to the foundation with a combination of anchor bolts and epoxy grout. Many papers have been written on the techniques required to obtain a good quality installation free of voids and properly bonded to the concrete and baseplate itself so as to give a long trouble-f...

INTRODUCTION Beijing subway line 14 includes four stations and approximately 2.8 km of tunnels between the Dongfengbeiqiao and Jingshunlu areas of the city. Due to the surface and underground space limitations of this section, a double-track running tunnel instead of two single-track running tunnels was adopted to connect the two stations. The double-track tunnels were excavated by a 10.22 m di...

In this study, the deformation characteristics and mechanical properties of coal rock mass in S2N5 working face Xiaokang mine are analyzed to address problem large soft rocks with high situ stress surrounding roadways. Through a newly developed grouting pipe, double-shell technology, consisting low-pressure high-pressure split grouting, is proposed for mine. addition, effect evaluated by boreho...