Geothermal exploitation test method under simulated complex load condition

Abstract

The invention discloses a geothermal exploitation test method under a simulated complex load condition. According to the method, the multi-field coupling test data of a seepage field, a temperature field, a stress field, a strain field and the like of the caved broken rock mass under the complex disturbance conditions, such as a static load, an impact load, a long-time stable load, a periodic pulse, a vibration load, an actually measured disturbance load and the like can be accurately obtained, the complete rock body lithology of different rock samples, the rock-rock and water-rock heat exchange rules, fractured rock mass seepage field distribution rules and fractured rock mass internal stress field evolution rules of the complete rock mass heat source temperature, the fractured rock masslithology, the particle size, the gradation, the combined distribution forms and the like on the conditions, such as different applied loads, disturbance conditions, seepage fluid initial temperature,seepage fluid initial pressure, etc., and the multi-field coupling effect mechanism of the stress field, the strain field, the seepage, the temperature field and the like can be researched conveniently, and the more accurate test data is provided for the research of a deep geothermal exploitation technology under a complex load condition.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for studying geothermal exploitation under complex load conditions, and belongs to the field of geotechnical engineering test technology and equipment. Background technique [0002] As a clean energy source, geothermal energy is receiving increasing attention all over the world. Geothermal energy is stored underground and is not affected by climatic conditions. It can be used as base load energy or peak load energy. From the perspective of its development and utilization costs, geothermal energy has the characteristics of low cost, less land occupation, and good stability. Compared with other renewable energy sources, it has more development potential. Deep high-temperature geothermal resources suitable for power generation are widely distributed in southern Tibet, western Yunnan and western Sichuan. At present, for this type of geothermal resources, the United States and other we...

AI Technical Summary

Problems solved by technology

However, due to various factors such as the fluidity and heterogeneity of the broken rock mass and the layered distribution and mixed distribution of the broken rock mass of various lithologies after the collapse of the rock formation, the seepage field, temperature field, stress field, and strain field of the broken rock mass are caused. The multi-field coupling problem is extremely complex, and the research methods using theory and numerical simulation have significant limitations, and research work must be carried out on the basis of reliable data from laboratory tests

[0004] However, the existing broken rock mass test devices and methods cannot realize the scientific experiment work in this innovative strategic research field, mainly due to the following aspects: 1. the broken rock mass cannot be compacted, seepage, heat exchanged, and powered at the same time. Coupling test; ②The essence of the enhanced geothermal mining method is that the hot dry rock in the upper part after blasting provides a stable heat source, and the broken rock mass that falls down increases the heat exchange area. The direct heating of the whole body cannot simulate the heat exchange process between the complete rock mass and the broken rock mass; , Water pressure and temperature cannot be measured accurately, and when studying the coupling relationship of various physical quantities, the pressure of broken rock mass, seepage water pressure and temperature at a certain point must be measured at the same time. Various physical quantities at the same position, or the inability to obtain the position coordinates and stress directions of the measured points will lead to inaccurate test data; The wave signals of dynamic loads such as vibration and impact are accurately applied to the broken rock mass in the laboratory. The existing test technology applies the simplified impact dynamic load to the rock mass and cannot reflect the actual situation, resulting in a large deviation between the experimental results and the actual situation; ⑤ It is difficult to install and disassemble, and the test efficiency is low. Due to the high rigidity required for the pressure chamber of the broken rock mass, the thickness and weight of each part of the pressure chamber are relatively large, it is difficult to install and disassemble manually, and the broken rock mass after the compaction test forms a vacuum locally , exacerbating the difficulty of disassembly

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