Detection method of grouting reinforcement effect in tunnel

Abstract

The invention relates to a detection method and a detection device of grouting reinforcement effect in a tunnel, belonging to the field of tunnel engineering. The detection method of grouting reinforcement effect in the tunnel comprises the following steps: horizontally and respectively drilling the detection device into tunnel headings before and after grouting by using a drilling machine; forming an elliptical pilot tunnel in soil mass; inflating and pressurizing the measuring gas chamber of the device, and detecting the displacement of the short axis and the long axis of the elliptical pilot tunnel under the pressure at all levels; computing mechanical parameters (coefficient KO of earth pressure at rest, Poisson ratio mu and elastic modulus E) of the soil mass before and after grouting according to the elasticity theory formula; comparing the mechanical parameters of the soil mass before and after grouting; and making a conclusion of the grouting reinforcement effect according to the variation of the mechanical parameters of the soil mass before and after grouting. The core component of the detection device is the measuring gas chamber which is composed of a tubular expanded inner cavity and a rubber expanded film, and after the device is drilled into the soil mass, the displacement sensor and the pressure sensor of the measuring gas chamber are used for detecting field data. The invention has simple operation and can quickly, quantitatively and scientifically evaluate the grouting reinforcement effect.

Description

technical field [0001] The invention belongs to the field of tunnel engineering and relates to a method for inspecting the grouting reinforcement effect in a tunnel and a detection device thereof. Background technique [0002] At present, in the construction of large-scale urban subways and mountain tunnels, grouting has become an effective and common method for ground reinforcement, waterproofing and water blocking. Its quality will directly affect the probability of water leakage and landslides and accidents in the tunnel. And grouting is a hidden project, its quality is not easy to detect, and an effective, quantitative and scientific evaluation system has not yet been formed. Existing inspection methods for grouting effects include: P-Q-t curve method, in-situ penetration method, sampling indoor test method, etc. Among them, the P-Q-t curve method is more commonly used, which is based on the relationship between grouting pressure, grouting amount, and grouting time. To...

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Problems solved by technology

The mechanical parameters measured by indoor tests often cannot truly reflect the changes of actual parameters on site

The change of mechanical parameters of soil before and after grouting is crucial to scientific research, especially in numerical simulation, the accuracy of mechanical parameters has a great influence on the simulation results, and the mechanical parameters measured in situ of the soil must be obtained , and the existing in-situ measurement methods are to measure vertically from the ground to the underground, because the specific position of the grouted soil cannot be accurately measured from the ground, so the method of drilling from the ground is time-consuming, laborious, damaging to the environment, and impossible A lot of useless work has been avoided. In addition, the existing in-situ measurement devices are bulky, low in automation, inconvenient to operate, and difficult to directly use the measured parameters for numerical calculations. Therefore, the original methods and devices are not suitable for injection in tunnels. Inspection of slurry

Therefore, a method of directly drilling horizontally from the face of the tunnel was proposed, but at this time the measurement principle has changed, so the original measuring instruments cannot be used

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