Improving method suitable for bulging and cracking of tunnel bottom filling structure

Abstract

The invention discloses an improving method suitable for bulging and cracking of a tunnel bottom filling structure. The improving method comprises the following steps that S01, micro pile positions and sleeve valve pipe grouting pile positions are staggered at intervals at the bulging and cracking section of the tunnel bottom filling structure; S02, the micro pile positions and the sleeve valve pipe grouting pile positions are sequentially drilled to the design depths by a drilling machine; S03, micro piles are embedded in micro pile holes, the micro pile holes are grouted through a grouting pipe by a grout conveying pump, and after grout is solidified, cushioning plates are arranged at the ends of the micro piles, and a certain pretightening force is applied to the cushioning plates; and S04, sleeve valve pipes are embedded in sleeve valve pipe grouting holes, and are filled with sleeve valve casing materials, and sectioned grouting reinforcement is conducted on a base surrounding rock through the sleeve valve pipes. The tunnel base surrounding rock can be reinforced, the tensile stress of the tunnel bottom filling structure is reduced, the bulging and cracking phenomenon of the tunnel bottom filling structure is effectively improved, and construction is simple, convenient and quick.

Description

technical field [0001] The invention belongs to the technical field of tunnel disease treatment, and in particular relates to a treatment method suitable for uplift and cracking of filling structures at the bottom of tunnels. Background technique [0002] Most of the tunnel projects in my country do not set waterproof boards or drainage permeable layers at the bottom of the tunnel. The concrete at the bottom of the tunnel is directly in contact with the surrounding rock. A certain amount of water pressure acts on the structure. In recent years, with the large-scale construction of high-speed railways and expressways in my country, the cases of uplift and cracking of filling structures at the bottom of tunnels under the action of water pressure have increased. Cracks at the bottom of the tunnel and the lifting of the ballast bed seriously affect the safety of driving. For high-speed railway tunnels that use ballastless ballast beds, the hazards are even greater. [0003] For...

AI Technical Summary

Problems solved by technology

Therefore, when the tunnel invert is closed or the construction is completed, as the surrounding rock seepage field tends to be stable, the water pressure acting on the invert will gradually increase, and eventually the invert will be subjected to a certain amount of water pressure. If the water pressure value of the inverted arch exceeds the critical water pressure value that the inverted arch can withstand, it will lead to the occurrence of uplift and cracking of the filling structure at the bottom of the tunnel under the action of water pressure

Images