Device for testing horizontal permeability of cement-soil deep mixing column indoors and test method

Abstract

The invention relates to the field of performance test of a cement-soil deep mixing column, in particular to a device for testing horizontal permeability of a cement-soil deep mixing column indoors and a test method. The device comprises a load frame, a hydraulic cylinder which is fixed on the load frame and is provided with a piston rod, a force sensor fixed at the end of the piston rod, a water tank fixed on the load frame, a water inlet tube, valves connected to the water inlet tube in series, a circular disc base, an outer circular ring circularly connected with the base hermetically, and a drain pipe. The device is novel in structure and skillful in concept, and a blank for testing the horizontal permeability of the cement-soil deep mixing column is filled. Through the device and the test method, the horizontal permeability of the cement-soil deep mixing column is accurately tested, and the horizontal integrity of the cement-soil deep mixing column is further evaluated.

Description

technical field [0001] The invention relates to the field of performance detection of cement-soil mixing piles, in particular to a device and a testing method for indoor testing the permeability of cement-soil mixing piles in the horizontal direction. Background technique [0002] Cement-soil mixing piles are based on the physical and chemical reaction process of cement-reinforced soil. They are widely used to increase the bearing capacity of soft soil foundations, reduce settlement, improve the stability of slopes, and serve as underground anti-seepage walls to prevent underground seepage water flow, etc. Among them, permeability is an important indicator of the integrity of cement-soil mixing piles, but in actual engineering and most experiments are to measure the vertical permeability of cement-soil mixing piles, rarely involving the horizontal direction of cement-soil mixing piles In engineering practice, the horizontal permeability of cement-soil mixing pile is the ...

AI Technical Summary

Problems solved by technology

Among them, permeability is an important indicator of the integrity of cement-soil mixing piles, but in actual engineering and most experiments are to measure the vertical permeability of cement-soil mixing piles, rarely involving the horizontal direction of cement-soil mixing piles Permeability, and in engineering practice, the horizontal permeability of cement-soil mixing pile is the key to its performance, so it is very necessary to accurately measure the horizontal permeability of cement-soil mixing pile

[0003] At present, the commonly used method for measuring permeability is the "variable head method", but the variable head method is only suitable for measuring fine-grained soil, and the hydraulic head pressure generated by variable head is not large, and the vertical permeability is measured. This method will cause many errors in the permeability measurement of cement-soil mixing piles. The particles of cement-soil mixing piles are finer and denser than fine-grained soil, and require greater water pressure to infiltrate.

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