Intensified Freezing Construction Method in Partial Difficult-to-freeze Ground

Abstract

A freezing strengthening construction method for partial stratums difficult to freeze includes the following steps: drilling holes in stratums sensitive to freezing, expanding the holes in the partial stratums difficult to freeze, filling hole expanded segments with heat conduction materials, cleaning the hole expanded segments and continuing drilling, and finally lowering freezing tubes after the holes are formed and carrying out freezing construction. Due to the fact that the holes are expanded in the partial stratums difficult to freeze and the heat conduction materials are put in the holes, the method solves the problem that joint circles of the partial stratums difficult to freeze can not be frozen in a conventional freezing method, achieves fast strengthening freezing of the partial stratums difficult to freeze, achieves active regulating and optimizing of freezing cold energy of the stratums, shortens freezing time, and saves energy.

Description

technical field [0001] The invention belongs to the fields of mine construction engineering and urban underground engineering, and relates to a construction method for enhanced freezing of locally difficult-to-freeze strata, in particular to an enhanced freezing construction method for expanding holes and filling heat-conducting materials in locally difficult-to-freeze strata, and is especially suitable for rich water Enhanced freezing of hard-to-freeze formations such as soft rock, deep clayey soil and mudstone. Background technique [0002] The natural strata are complex and diverse. Some strata such as cohesive soil and mudstone covering the lower part of the alluvial layer have a slower freezing expansion speed than other soil layers under the same freezing conditions, and the average temperature of the frozen wall is higher, which has the characteristics of low strength and easy rheology. This contradicts the high-stress environment in which the formation is located, w...

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Problems solved by technology

[0008] In view of the above-mentioned problems in the prior art, the present invention provides a construction method for enhanced freezing of local hard-to-freeze strata to solve the problem that the hard-to-freeze stratum cannot be frozen for a long time by conventional freezing methods, and aims at the thermal physics between strata. Differential freezing based on the characteristics and distribution of groundwater to realize the active regulation and optimization of cold energy

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