Effect of initial pore pressure on undrained shear behaviour of fine-grained gassy soil
Effect of initial pore pressure on undrained shear behaviour of fine-grained gassy soil
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DOI：
10.1139/cgj-2017-0015
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发表时间：
2017-09
影响因子：
3.6
通讯作者：
Yi Hong;Lizhong Wang;C. Ng;B. Yang
中科院分区：
文献类型：
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作者：
Yi Hong;Lizhong Wang;C. Ng;B. Yang
世界上许多化石燃料储量都位于海床下不同水深的细颗粒沉积物中。细粒度沉积物中含有较大的生物气泡，这对支撑油气平台的海上基础的稳定性构成了挑战。虽然发现细粒气质土通过改变初始孔隙压力ui（与水深有关）表现出不同的不排水剪切强度（cu），但关于ui对土壤不排水剪切行为影响的系统研究仍然缺乏。本研究报告了一系列不排水三轴试验，旨在比较和研究在相同固结压力（p c '）下，在不同ui （0-1000 kPa）范围内重构的细粒气土的响应。含气试样剪切引起的超孔隙压力（Δu）高度依赖于ui。它可以小于具有相同cp '的饱和试样(由于Δu int的部分耗散…
Many of the world reserves of fossil fuels are located at various water depths in fine-grained sediment under the seabed. The fine-grained sediment contains relatively large biogas bubbles, which has been posing challenges to the stability of offshore foundations supporting oil and gas platforms. Although fine-grained gassy soil was found to exhibit different undrained shear strengths (cu) by altering the initial pore pressure, ui (relevant to water depth), systematic studies concerning the effect of ui on undrained shear behaviours of the soil are still lacking. This study reports a series of undrained triaxial tests aiming to compare and investigate the responses of reconstituted fine-grained gassy soil with the same consolidation pressure (p c ′ ), but at a wide range of varying ui (0–1000 kPa). The shearing-induced excess pore pressure (Δu) in the gassy specimens highly depends on ui. It can be either smaller than that of the saturated specimen with the same p c ′ (due to partial dissipation of Δu int...