Liquefaction prevention and control method of dredged sand based on straw degradation and microbial grouting and the control structure formed
A technology of sand filling and microbial application in infrastructure engineering, soil protection, construction, etc., can solve problems such as prominence, poor water retention, salinization, etc. The effect of liquefaction
Active Publication Date: 2021-09-21
YANCHENG INST OF TECH
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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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[0050] The dredger sand liquefaction control method based on straw degradation and microbial grouting provided by this application specifically includes the following steps:
[0051] In the first step, before the filling project is carried out, the waste straw is crushed to form broken straw, and the broken straw is soaked in the alkali solution for at least 24 hours; the straw itself has water absorption characteristics, and the water absorption performance of the broken straw after soaking in the alkali solution is improved. Greater enhancement, the enhanced water absorption can reduce the water content of the dredged sand and improve the internal anti-liquefaction ability; at the same time, the soaking treatment of the alkali solution destroys the structure of the broken straw, which can effectively improve the gas production efficiency of the straw during degradation , the alkaline solution can choose NaOH, Ca(OH) 2 Etc., during actual soaking operation, what this preferre...
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The invention relates to a method for preventing and controlling the liquefaction of dredged sand based on straw degradation and microbial grouting and the formed prevention structure. The prevention and control method is an environmentally friendly method for preventing and controlling dredged sand liquefaction and improving soil quality. characteristics to reduce the moisture content of sandy soil, and the degradation and gas production characteristics of straw to reduce the saturation of sandy soil. The reinforcement of the dredger sand ultimately improves the liquefaction resistance of the dredged fill sand.
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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IPC IPC(8): E02D3/00E02D3/12E02D19/04
CPCE02D3/00E02D3/12E02D19/04
Inventor 邱成春徐桂中张丹翁佳兴宋苗苗吉锋别学清殷勇高闻川
Owner YANCHENG INST OF TECH