Method for judging leakage of waterproof curtain of foundation pit by using artificial heat source and temperature tracing of underground water

Abstract

The invention relates to a method for judging leakage of a waterproof curtain of a foundation pit by using an artificial heat source and the temperature tracing of underground water. The method comprises the following specific steps of: 1) performing geological exploration of geotechnical engineering and field survey to determine the relative hydrogeology parameters of a targeted foundation pit, wherein the relative hydrogeology parameters comprise an osmotic coefficient, a thermal coefficient, a water storage coefficient and the like; 2) reasonably arranging observation wells inside and outside the pit by using the original well site to ensure that two sides of the waterproof curtain covering the foundation pit are not leaked; 3) measuring the initial temperature field parameters of drilled holes inside and outside the targeted foundation pit on site to obtain the distribution characteristic, the normal value and the like of the foundation pit; 4) applying the heat source to the drilled hole outside the foundation pit to ensure that the temperature in the drilled hole outside the foundation pit is raised; and 5) measuring the temperature in the drilled hole inside the foundation pit, analyzing and judging according to the obtained initial temperature field value, reasoning by combining knowledge of thermodynamics, and judging and positioning the possibly leaked points. The method is definite in principle and high in adaptability; under the condition that the original observation well is utilized, the observation well can be increased appropriately; the leakage of the foundation pit is judged by applying the heat source into the drilled hole outside the pit actively; and the temperature field of the underground water of the observation wells is analyzed and judged by combing the knowledge of thermodynamics, so that the double aims of judging and positioning the leakage of the foundation pit can be fulfilled quickly and conveniently.

Description

technical field [0001] The invention belongs to the field of deep foundation pit dewatering mainly used in municipal engineering, industrial and civil construction projects, and in particular relates to a method for judging leakage of foundation pit water-stop curtains by using artificial heat sources and groundwater temperature traces. Background technique [0002] In the construction of foundation pits, especially in the excavation construction of super-large and ultra-deep foundation pits, the water-stop curtain of foundation pits plays an important role in ensuring safety. If the water-stop curtain of the foundation pit leaks, the groundwater level will grow higher, which will adversely affect the construction in the foundation pit, and in serious cases will threaten the construction or even directly cause the foundation pit to collapse. Therefore, leakage monitoring has always been an important link in the construction of foundation pit engineering. The usual method is...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies and defects of the existing technology, the technical problem to be solved by the present invention is to provide a method for judging the leakage of the water-stop curtain of the foundation pit by using the artificial heat source and the groundwater temperature tracer on the basis of the existing borehole.

Images