Retarded cement grout for sealing water of ultra-deep freezing-hole solid pipe

Abstract

The invention relates to a retarded cement grout for sealing water of an ultra-deep freezing-hole solid pipe. Cement and water, at a mass ratio of water to ash being (1: 1) to (1.25:1), are taken as main base stocks and are mixed and stirred, and then stabilizing agents, retarders, expanding agents and tackifiers by weight percent of the usage of the cement are respectively added, mixed and stirred, thereby obtaining the retarded cement grout. The initial solidifying time of the retarded cement grout can reach 36 hours and the allowed sinking time of a freezing pipe can reach 32 hours. Hole-forming slurry is locally or wholly replaced by the retarded cement grout, and after the retarded cement grout is solidified, a local or whole hole water-sealing section can be formed in the hole, so that the hydraulic power connection of deep and shallow ground layers is isolated, the freezing-hole is prevented from becoming a water-conducting channel after a freezing wall is unfrozen and the safety of deep underground engineering is ensured. The retarded cement grout is suitable for the water sealing construction of the freezing-hole solid pipe under the conditions of 1200m hole-depth and 40 DEG C ground temperature in a whole-depth freezing process shafting project. The retarded cement grout has significant engineering practical value in ensuring the engineering safety and avoiding water resource loss, and the economic benefit and the social benefit are obvious.

Description

technical field [0001] The invention relates to a slow-setting cement slurry, which is particularly suitable for the construction of solid pipe sealing water in frozen holes under the condition that the hole depth reaches 1200m and the ground temperature reaches 40 DEG C in full-deep frozen drilling engineering. Background technique [0002] In the freezing construction of geotechnical engineering, the frozen hole will become a water-conducting channel after thawing; especially in the drilling of the full-depth freezing method, the frozen hole passes through the auxiliary chamber of the shaft such as Matoumen, and the water in the shallow aquifer after the frozen hole is thawed and The sand is easy to conduct to the deep part. On the one hand, it will seriously threaten the safety of the roadways and chambers at the bottom of the mine, and on the other hand, it will lead to the loss of shallow water resources, which will have an adverse impact on the water-scarce western regio...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of retarded cement slurry for super-deep freezing hole solid pipe sealing water, under the premise of meeting the time requirement of freezing pipe running time, to solve the safety of roadway chambers such as underground parking lots and shallow water resources. churn problem