检索条件"作者=2 Key Laboratory of Soft Soils and Geoenvironmental engineering, Ministry of Education, and department of Civil engineering, Zhejiang {3., Hangzhou 3.0058, China"
Grouting behind segments is a key process in constructing a shield tunnel,which is very important to the shield tunnel's final longitudinal *** we use GPR(Ground Penetrating Radar) to take nondestructive detection on ...
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Grouting behind segments is a key process in constructing a shield tunnel,which is very important to the shield tunnel's final longitudinal *** we use GPR(Ground Penetrating Radar) to take nondestructive detection on the distribution of grouting behind *** of the velocity of the electromagnetic wave in the medium is a key technique for assuring the detecting precision and figures identification. In this paper,the coaxial probe method with a network analytic instrument was firstly introduced to detect the dielectric constants of the grouting slurries and soils behind shield tunnel segment,which have a large effect on the measurement result of *** comparison and direction deduce analyses on obtained graph were done,and all these provide a basis for the GPR detection on the distribution of grouting behind segments.
Slurry shield method is a wide-used tunnelling method in saturated soft soil,especially for crossriver cases under the high water pressure and complex geological ***,in extremely unfavorable geological conditions,face...
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Slurry shield method is a wide-used tunnelling method in saturated soft soil,especially for crossriver cases under the high water pressure and complex geological ***,in extremely unfavorable geological conditions,face instabilities may *** order to better understand the mechanism of face stability, this paper presents a series of tests:slurry infiltration testing,strength testing by a true triaxial apparatus and the filter cake microstructure behavior scanning by an ESEM *** results of the tests will be a help to explain the following problems:shield tunnelling in heterogeneous soils,the matched slurry additives for corresponding soil layers,the effects of the slurry penetration and gelling on the strength of soil under different conditions and different microstructures of the filter cake upon the infiltration of the slurry.
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