ACOUSTIC-EMISSION METHOD FOR CONTROLLING CHANGES IN THE STABILITY OF A SOIL MASSIF TREATED WITH HARDENING SUBSTANCES Russian patent published in 2022 - IPC G01V1/00 G01N29/14 G01N3/18 G01N25/58 G01N33/24 

FIELD: engineering and geological surveys.

SUBSTANCE: invention relates to engineering and geological surveys, in particular to methods for determining changes in the stability of soil foundations subjected to chemical-physical fixing. In the claimed method, emitters of elastic waves and probes are placed in the soil base, each of which contains a heating element, a receiving acoustic transducer and a thermometer. Additionally, other sensors, such as pressure sensors, can be placed in the probes. Soil samples are taken from the examined massif and cured using the same technology that was used to strengthen the massif. On such samples, the correspondence of the AE parameters to the stages of the deformed state of the soil and its characteristics is established according to standardized methods, for example, according to GOST 21153.2. With the help of probes, the soil mass is cyclically heated and acoustic emission (AE) is recorded, both stimulated in the geoenvironment by heating, and when it is sounded by elastic waves. The values of the activity and duration of the D_imp of AE pulses are determined, averaged over the time of heating the soil to the operating temperature М[D^I_imp(х)] and for part of the exposure interval at this temperature М[D^II_imp(x)]. The values of the amplitude A_imp, the number of spikes in the pulse V_imp, the energy of the source E_sour of the signals passing through the ground are determined, averaged over the sounding time M[A_imp^ref(0)], M[V_imp^ref(0)], М[E_sour^ref(0)] of the soil by elastic waves before its first heating and for the interval of sounding M[A_imp^mes(x)], M[V_imp^mes(x)], М[E_sour^mes(х)], produced in each cycle of holding the soil at operating temperature after the registration of the D_imp values used to determine M[D^II_imp(x)]. The indicator R^tgr_neu(x) is calculated: . Comparing the full-scale values of R^tgr_neu(x) with each other and with the values of R^tgr_neu(L) obtained on the samples and the corresponding results of their tests according to standardized methods, the change in the stability of the soil mass is judged.

EFFECT: expanding the functionality of the method by providing the ability to determine the change in the stability of the soil mass treated with hardening substances, containing the foundations intended for placing buildings and structures on them, and increasing the performance of monitoring the state of the geoenvironment by the method for acoustic emission.

1 cl, 3 dwg