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目的:常规的地基抗液化技术成本较高或实施复杂,因此有大量的工程建设未得到有效的抗液化处理。本文旨在提出一种新型的、基于微生物诱导减饱和作用的地基液化治理技术,期望能应用到普通的建筑和结构的抗液化治理中。创新点:1.获得一种基于微生物反硝化过程的砂土减饱和方法;2.试验验证微生物减饱和法处理砂土的抗液化性能,获得微生物减饱和法处理砂土中的气泡分布形态以及气泡在静水和渗流条件下的稳定性规律。方法:1.利用微生物反硝化过程中产生的氮气降低饱和液化砂土的饱和度;2.利用电脑断层扫描(CT)技术研究微生物减饱和法处理的砂土中气泡的分布形态;3.利用振动台实验和三轴固结不排水试验研究微生物减饱和法处理的砂土的力学性能和抗液化性能;4.采用一种自行研制的模型试验(图13)研究微生物减饱和法处理的砂土在静水和渗流条件下气泡的稳定性。结论:1.利用微生物反硝化过程可以实现可控的砂土饱和度降低;2.微生物气泡在砂土中以小空隙的形态存在,小空隙的尺寸略大于砂土的平均粒径;3.将饱和松砂的饱和度略作降低,其不排水强度和抗液化性能得到显著提升;4.微生物减饱和法处理的砂土中的气泡在静水条件下是稳定的,但是在稳定渗流条件下会被水流缓慢带走,此时,需要采用一些手段来控制通过减饱和区的渗流。
Purpose: Conventional liquefaction-resistant technologies are costly or complex to implement and therefore a large number of projects have not been effectively liquefied. The purpose of this paper is to propose a new type of liquefaction treatment technology based on micro-organisms induced desaturation, which is expected to be applied to the anti-liquefaction treatment of ordinary buildings and structures. Innovative points: 1. To obtain a method based on microbial denitrification sand desaturation method; 2. Experimental proof of anti-liquefaction of soil by microbial desaturation method to obtain microbial decontamination method to deal with sand bubble distribution patterns and Stability of Bubbles under Static and Seepage Conditions. Methods: 1. Saturated degree of saturated liquefied sandy soil was reduced by using nitrogen generated during denitrification; 2. Computed tomography (CT) was used to study the distribution of bubbles in sand treated by microbial desaturation; 3. Utilization of Shaking table experiment and triaxial consolidation undrained test to study the mechanical properties and anti-liquefaction properties of sand treated by microbial desaturation method.4. Using a self-developed model test (Figure 13) to study the effect of microbial desaturation method sand Stability of Bubbles in Soil under Seepage and Still Water Conditions. The results showed that: 1. The controllable decrease of sand saturation can be achieved by using the microbial denitrification process; 2. The microbial air bubbles exist in the form of small voids in the sand and the size of the small voids is slightly larger than the average particle size of the sand; 3. The saturation of saturated sands is slightly reduced, and its non-drainage strength and anti-liquefaction properties are significantly improved.4. The bubbles in sand treated by microbial desaturation method are stable under static water conditions, but under steady seepage conditions Will be slowly taken away by the water, at this time, some means need to be used to control seepage through the desaturated zone.