Damage Model and Experimental Study of a Sand Grouting-Reinforced Body in a Seawater Environment

Hongbo Wang,Qingsong Zhang,Zhipeng Li,Shangqu Sun,Quanwei Liu,Pengfei Zhang

doi:10.3390/w12092495

Abstract

A water-rich sand layer is a common stratum in marine underground engineering. Grouting is a technology for soil or rock sealing, a method to solve the water seepage problem, and can be used to solve geological challenges in water-rich sand layers. A grouting-reinforced body deteriorates by the long-term erosion of seawater, resulting in attenuation of the performance of the solid. Obtaining the decay law of the performance of the grouting-reinforced body can guarantee the safe operation of the underground structure over a long life cycle. To this end, by describing the solid damage after seawater erosion, the stress–strain curve and the relationship between the damage variable and the internal micro-cracks and pores in the grouting-reinforced body were analyzed. Then, a constitutive model of the solid damage in the seawater environment was established. The stress–strain curve of added solid after deterioration was obtained by designing an indoor grouting reinforcement test and an accelerated deterioration test. Finally, the constitutive model of the sand layer plus solid deterioration in a seawater environment was determined. This research is of great importance for improving the deterioration theory under a seawater environment and ensuring the long term safety of tunnel operations.

Highlights

IntroductionWith the rapid and sustainable development of the national economy, the construction and operation of underground projects under a marine environment, such as undersea tunnels and offshore subways, are developing vigorously
China has a long coastline and numerous islands [1]
Many studies have beenbeen carried out on seawater erosion,erosion, these results mainly focus on the macroscopic properties of seawater on stone bodies and seldom involve damage focus on the macroscopic properties of seawater on stone bodies and seldom involve damage models

Summary

Introduction

With the rapid and sustainable development of the national economy, the construction and operation of underground projects under a marine environment, such as undersea tunnels and offshore subways, are developing vigorously. Adverse geology is an important threat to the construction and operation of projects. The water-rich sand layer has become one of the important geological challenges that affect the safety of submarine tunnel construction because of its low cementation strength and poor self-stability [2,3]. Grouting is the most commonly used method to solve the geological hazards of water-rich sand beds. It is very important to study the damage model of adding solids in a seawater environment and predict the long-term durability of the added solids to ensure the safety of the tunnel over the long term

Methods

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Discussion

Conclusion