Abstract
Water-rich sand is a common stratum in marine underground engineering. Grouting is the most common method for solving geological disasters in water-rich sand. However, the marine environment differs greatly from the land environment. The erosion and seepage of seawater ion cause significant deterioration of grouted body, which reduces the physical and mechanical properties of grouted body. The maintenance of grouted body performance is the guarantee of long-term safe operation of the tunnel in the marine environment. In order to solve the problem of long-life grouting design for sand layer in seawater environment, an accelerated test of grouted body erosion under seawater erosion environment is designed to study the mesomorphological characteristics of seawater erosion on grouted body erosion and to reveal the mechanism of seawater erosion and solids. The evolution law of grouting plus solid strength under different slurry water-cement ratios and different seawater erosion time conditions is analyzed. The results show that the grouting plus solid effective time for water-cement ratios of 0.8 : 1, 1 : 1, 1.4 : 1, and 2 : 1 is 75a, 60a, 30a, and 15a; the index of strength degradation ratio of seawater environment to grouting plus solids is proposed, and the quantitative relationship between seawater erosion time and grouting plus solids strength is established, which provides theoretical basis for sand layer grouting reinforcement in seawater environment. We hope to provide some reference for the design and construction of sand grouting in seawater environment.
Highlights
Marine underground engineering entered a period of largescale construction. e construction and operation of underground engineering in marine environments such as subsea tunnels and offshore subways are booming
Poor geology is one of the important threats to engineering construction and operation. e water-rich sand layer becomes one of the important geological disaster sources affecting the safety of the subsea tunnel during construction due to its low cementing strength and poor self-stabilizing ability
Chu et al [15] studied the mechanism of chloride ion erosion on cement soil and based on the research results put forward measures to prevent chloride ion erosion on cement soil
Summary
Marine underground engineering entered a period of largescale construction. e construction and operation of underground engineering in marine environments such as subsea tunnels and offshore subways are booming. E water-rich sand layer becomes one of the important geological disaster sources affecting the safety of the subsea tunnel during construction due to its low cementing strength and poor self-stabilizing ability. Bai et al [10] studied the change law of the properties of cement soil under different erosion environments and obtained the strength-time relationship of cement soil. Cement soil is often used in geotechnical engineering under the environment of seawater, groundwater, and other erosion Under such environmental conditions, cement soil often contains some corrosive ions, such as SO42− and Cl− , and its mechanical properties are affected by environmental erosion, for example, the strength and durability of cement soil will change to different degrees. The evolution law of grouting plus solid strength under different conditions of slurry water-cement ratio and seawater erosion time is analyzed. The strength degradation ratio index of seawater environment to grouting plus solids is proposed, and the quantitative relationship between seawater erosion time and grouting plus solids strength is established
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