Influence of temperature effect on shear strength and particle breaking evolution characteristics of coral reef sand
HE Shaoheng1，XIA Tangdai1，LI Lingling1，DING Zhi2，SHAN Huafeng3
(1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；3. Institute of Coastal Environment
and Geotechnical Engineering，Taizhou University，Taizhou，Zhejiang 318000，China)
Abstract：In the construction of many high-temperature infrastructure projects such as submarine oil and gas pipelines in South China Sea，it is necessary to master the effect of temperature on the mechanical properties of coral reef sand on which these projects are seated. The drained triaxial shear tests of coral reef sand from South China Sea were carried out under different temperatures，and the effects of high temperature on shear strength，particle breakage，friction angle and critical state of coral reef sand were studied in depth by comparing with the test results of quartz sand. It is shown that the effects of temperature on the mechanical behaviors of quartz sand and coral reef sand are quite different. Increasing temperature causes pore water discharge of quartz sand，increases the effective contact of soil particles and consequently increases the shear strength and dilatancy of quartz sand. However，increasing temperature results in a significant decrease in both shear strength and dilatancy due to particle breakage and rearrangement of coral reef sand. There exists a temperature threshold value. When the temperature is higher than the threshold value，increasing temperature causes the coral reef sand particles to break and the shear strength to decrease significantly. With increasing the temperature，the relative particle breakage index of coral reef sand increases，and the critical state line in the p?-q plane rotates towards p?-axis. The peak and critical friction angles of coral reef sand have a corresponding negative correlation function relationship with the relative particle breakage index of coral reef sand.
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2019, Vol. 38 
