Microorganism induction silty-fine sand consolidating soft soil roadbed ecological improvement method

Abstract

The invention provides a microorganism induction silty-fine sand consolidating soft soil roadbed ecological improvement method. Microorganism adopts bacillus pasteurii, the strain initially is freeze-dried powder, and bacteria activation and culture are carried out in a culture solution to obtain a concentrated solution of bacillus pasteurii; then silty-fine sand is mixed into soft soil, the mixing ratio of silty-fine sand is 10-20%, and the silty-fine sand provides large-size aggregate for a soft soil road; and the concentrated solution of bacillus pasteurii is mixed into a nutrient solutionand injected into a sandy roadbed, and then a consolidation solution is injected until the roadbed reaches an expected goal. The microorganism induction silty-fine sand consolidating soft soil roadbedecological improvement method applies interdisciplinary subjects, and biochemical technology is used for treating soft soil roadbed, so that the problems of high pollution, high energy consumption and the like of traditional physical and chemical methods for treating roadbeds are solved, the strengthen treatment on the soft soil roadbed can be realized, and the problems of environmental pollutionand energy consumption are reduced.

Description

technical field [0001] The invention relates to the technical field of microorganism-induced calcium carbonate precipitation reinforcement roadbed, in particular to an ecological improvement method for microorganism-induced fine sand consolidation soft soil roadbed. Background technique [0002] Under the reciprocating action of increasing traffic load (high speed, heavy load) on soft soil subgrade, its fatigue life and working performance are not optimistic. If the bearing capacity of subgrade soil is degraded and insufficient, or even liquefied, it may cause engineering disasters related to liquefaction, such as subsidence of subgrade, floating of underground pipelines and tunnels, instability of slopes, and excessive erosion of coasts or river banks. affect its transportation function. [0003] The traditional method of liquefied subgrade regulation needs to be improved and improved. For example, geotextile reinforcement technology has insufficient durability; chemical ...

AI Technical Summary

Problems solved by technology

For example, geotextile reinforcement technology has insufficient durability; chemical grouting based on cement, lime or organic glue is a high-energy-consuming and high-emission industry; and physical reinforcement methods such as subgrade soil replacement, pile foundation, and dynamic compaction are low in technical economy. Moreover, the construction cost in the built-up area is high, and large-scale construction machines are limited

Mechanical compaction and chemical grouting are currently the two most widely used soil reinforcement methods, but their disadvantages of high cost, high energy consumption, and environmental pollution and damage have prompted the exploration of new soil reinforcement technologies

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