Real-time detection device and method for advance curtain grouting effect of soft ground tunnel

Abstract

The invention discloses a real-time detection device and method for an advance curtain grouting effect of a soft ground tunnel. The detection device comprises a detection head arranged in weak surrounding rock of the tunnel and a signal receiver arranged outside the weak surrounding rock of the tunnel; the detection head is connected with the signal receiver; the detection head comprises a detection head body integrally formed, the front end of the detection head body is a soil penetrating conical head, and the soil penetrating conical head is a cone; a thin film pressure sensor is arranged onthe side surface of the cone, is in data connection with the external signal receiver, and is used for detecting soil pressure of the corresponding position in the weak surrounding rock of the tunnelin the grouting process and sending the soil pressure to the external signal receiver in real time; the signal receiver is used for acquiring and displaying soil pressure information sent from the detection head in real time; the device and method can acquire the grouting reinforcing effect in real time and judge the trend of the slurry vein in the soft soil layer in the construction process andprovide timely and effective guiding information for the construction process.

Description

【Technical field】 [0001] The invention belongs to the technical field of advanced curtain grouting for civil engineering tunnels, and in particular relates to a device and method for real-time detection of the effect of advanced curtain grouting for tunnels in weak strata. 【Background technique】 [0002] In the field of tunnel engineering, when encountering weak water-rich formations, advanced curtain grouting technology is often used to improve the characteristics of the surrounding rock in front. Compaction improves its mechanical properties, reduces its permeability coefficient, reduces the water content of the strata in the reinforced area, and reduces the risk of construction excavation. [0003] In the prior art, the detection of the effect of advanced curtain grouting in soft ground tunnels generally has a lag. After the construction of the tunnel’s advanced curtain grouting is completed, it is necessary to re-drill inspection holes to take cores according to 5% or mo...

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Problems solved by technology

[0004] Therefore, the existing detection method is time-consuming and labor-intensive, and due to the small number of inspection holes and the large inspection blind area, it cannot comprehensively judge the reinforcement effect of this cycle of grouting, which has certain limitations

At the same time, during the construction process, the direction of the grout veins in the soft soil stratum is difficult to control and predict. It is often difficult to draw correct conclusions through the core sample evaluation of the grouting effect, and it is impossible to provide timely and effective guidance information for the construction process in real time.

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