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大规模建设中面临越来越多的淤泥等超软土地基处理,其目的是尽可能排出超软土体中的水而使土体固结,以改善其物理力学性能.静动力排水固结法试图利用高能量冲击而将超软土中部分结合水转换为自由水,进而实现更多水的排出而有效固结.然而,目前还不十分清楚能造成这种水相变化的冲击荷载究竟要达到何种水平及速率.为此,在模拟条件的、淤泥土的不同类型荷载水平及速率试验基础上,进行核磁共振水相测试,探索了典型荷载水平及速率下这种超软土中结合水可转化为自由水的条件及规律,主要为:1)对应于通常工程荷载的较低能量真三轴试验荷载速率与水平(1.6 MPa/s与100 kPa及以下),淤泥类超软土中非自由水不能转化为自由水.2)对应于静动力排水固结法条件的高速冲击荷载下(每击荷载水平3787 kPa,速率631.2 MPa/s),非自由水可转化为自由水;且冲击总能量越大(遍数及击数越多),就越易析出自由水.3)约束样品的侧限刚度对非自由水转化为自由水的影响可忽略.
In large-scale construction, more and more silt and other ultra-soft ground treatment are faced with the aim of releasing the water in the ultra-soft soil as much as possible to consolidate the soil to improve its physical and mechanical properties. Attempts to exploit high-energy shocks to convert some of the bound water in super-soft soils into free water and thereby achieve more efficient drainage of water are well-established, however, it is unclear exactly what impact loading can cause this water phase change To achieve this level and rate.Therefore, on the basis of simulating conditions, different types of sludge load levels and rate tests, nuclear magnetic resonance water phase test was carried out to explore the typical load level and rate of this ultra-soft soil The conditions and rules for the conversion of water into free water are as follows: 1) The lower true triaxial test load rates and levels (1.6 MPa / s and 100 kPa and below) corresponding to normal engineering loads, Non-free water in the soil can not be converted into free water. (2) Non-free water can be converted into free water under high-speed impact load (3787 kPa per impact load, 631.2 MPa / s) corresponding to the conditions of static- And the impact of the total energy more (The more the number of passes and the number of hit), the more easy to precipitate free water .3) side of the sample constraint limits the stiffness of the non-free water into free water negligible impact.