Liquefaction control method of blow filling sand based on straw degradation and microbial grouting and formed control structure

Abstract

The invention relates to a liquefaction control method of blow filling sand based on straw degradation and microbial grouting and formed control structure. The control method is an environment-friendly method for controlling liquefaction of the blow filling sand and improving soil quality. According to the control method, water absorption characteristic of straw is used for reducing water contentof sandy soil, and saturation degree of the sandy soil is reduced through degradation and gas production characteristics of the straw. Meanwhile, the straw degradation and the microbial grouting promote each other. The sandy soil is reinforced by reducing the saturation degree of the sandy soil and improving mineralization of microorganisms, and finally liquefaction resistance of the blow fillingsand is improved.

Description

technical field [0001] The invention relates to a method for preventing and controlling the liquefaction of dredged sand based on straw degradation and microbial grouting and a formed prevention structure, belonging to the technical field of foundation treatment. Background technique [0002] With the rapid development of social economy, human beings' demand for land is becoming more and more intense, the scope of project construction sites is getting larger and larger, and the land reclamation in coastal areas is becoming more and more intense. The liquefaction of saturated dredging sand in these areas is a problem that affects project safety. It is also one of the important issues that need to be solved urgently in this region. At present, the treatment measures for liquefiable foundation mainly include replacement and filling method, dynamic compaction method, compacted gravel pile method and cement-soil mixing pile, etc.; The construction volume is huge and the cost is ...

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Problems solved by technology

[0009] From the above existing technologies, it can be seen that it is feasible to use microbial grouting technology to deal with liquefaction problems in theory and experiment, but in actual application, the construction technology is not perfect, and there is no unified construction standard, which makes it difficult for grout to enter deep soil Therefore, there is still a big gap in the distance from systematic engineering application; in addition, compared with inland areas, the dredger fill sand on the surface of the land area has lower organic matter content, poor water retention performance and salinization problems. In addition, there are generally problems of high salinity, strong winds and other harsh environmental conditions in the dredged land area, which greatly restricts the large-scale planting and growth of green plants on the dredged land area; The soil environment approach is of great importance

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