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Solutions to the Spherical Cavity Grouting Pressure in Circular Tunnels Based on the Generalized SMP Strength Criterion
(1 Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250031; 2 The First Company of China Construction Eighth Engineering Bureau Ltd., Jinan 250100)
Abstract Based on the generalized spatially mobilized plane (SMP) strength criterion, which reasonably considers the effect of intermediate principal stress on soil mass strength, this paper theoretically analyzes the spherical cavity compaction grouting process, establishes the generalized SMP strength criterion based solutions to the grouting pressure in circular tunnels, and verifies it by comparing with the measured values in the literature. At the same time, in combination with existing solutions based on MC strength criterion in the literature, this paper analyzes the characteristics of the influence of soil strength parameters on the grouting pressure. The results show that the grouting pressure based on the generalized SMP strength criterion is higher than that in the literature based on MC strength criterion, and is more conducive to setting the actual range of spherical cavity grouting pressure in engineering; the effect of strength parameters of soil mass on grouting pressure is significant, and the effect of cohesion is more significant than that of internal friction angle.
Abstract：
Based on the generalized spatially mobilized plane (SMP) strength criterion, which reasonably considers the effect of intermediate principal stress on soil mass strength, this paper theoretically analyzes the spherical cavity compaction grouting process, establishes the generalized SMP strength criterion based solutions to the grouting pressure in circular tunnels, and verifies it by comparing with the measured values in the literature. At the same time, in combination with existing solutions based on MC strength criterion in the literature, this paper analyzes the characteristics of the influence of soil strength parameters on the grouting pressure. The results show that the grouting pressure based on the generalized SMP strength criterion is higher than that in the literature based on MC strength criterion, and is more conducive to setting the actual range of spherical cavity grouting pressure in engineering; the effect of strength parameters of soil mass on grouting pressure is significant, and the effect of cohesion is more significant than that of internal friction angle.
ZHANG Chang′an1 QI Xiangcheng2
.Solutions to the Spherical Cavity Grouting Pressure in Circular Tunnels Based on the Generalized SMP Strength Criterion[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(3): 79-83
2021, Vol. 58 