The invention discloses a dry-hole pressure
relief valve and a
hydraulic fracturing crustal stress testing device, and relates to the technical field of rock
mass engineering testing. A valve core of the dry-hole pressure
relief valve is inserted in a valve cavity from the
insertion end of a valve body, and one end of the valve core extends out of the
insertion end; a plurality of pressure relief holes are formed in the end, away from the
insertion end, of the valve body, the valve core is provided with a blocking part which can block the valve cavity, and the insertion end of the valve body is provided with a limit nut for limiting the length of the part, extending out of the valve body, of the valve core; the part, located between the blocking part and the limit nut, of the valve core is sleeved with a load-bearing spring; the dry-hole pressure
relief valve is simple in structure and convenient to operate, and can effectively relieve pressure in a packer. A high-pressure pump of the
hydraulic fracturing crustal stress testing device is communicated with the top end of a drilling hole, the bottom end of the drilling hole is communicated with the dry-hole pressure relief value, the end, extending out of the insertion end, of the valve core is communicated with a switching valve, and the switching valve is communicated with the packer. Through the adoption of the
hydraulic fracturing crustal stress testing device, crustal stress tests can be conducted under the conditions of
deep drilling holes and dry holes by using a hydraulic fracturing method, and the tests are stable.