In soft rock formations, the anchoring efficiency of nylon speed drive anchor type'w' is related to engineering safety and stability. Structural improvement is the key to improving its performance. Next, the analysis will be carried out from multiple aspects such as material compounding, anchor shape optimization, and additional auxiliary structures.
First, enhancing the strength and adaptability of the anchor body through material compounding is the basis. Soft rock formations have the characteristics of low strength and large deformation. Pure nylon materials are prone to creep and wear under long-term stress. In the preparation process of nylon speed drive anchor type'w', high-strength fibers such as carbon fiber and glass fiber can be compounded with nylon matrix. Carbon fiber has the characteristics of high strength and high modulus, which can significantly improve the tensile strength of the anchor body; glass fiber can enhance the toughness of the anchor body, making it less likely to break during the deformation of soft rock. At the same time, nanoparticles such as nano-silicon dioxide can be added to improve the wear resistance and anti-aging properties of nylon materials, so that the anchor body maintains good mechanical properties in complex soft rock environments, thereby improving the anchoring efficiency.
Secondly, optimizing the geometric shape of the W-type anchor body can effectively enhance the anchoring effect. The tooth structure of the traditional nylon speed drive anchor type'w' may have insufficient grip in soft rock. The tooth pattern density and depth on the surface of the anchor body can be increased to form a tighter bite between the tooth pattern and the soft rock. In addition, the shape of the tooth pattern can be changed from straight teeth to spiral teeth or wavy teeth. When installing the anchor body, the spiral teeth or wavy teeth can better squeeze the soft rock and increase the lateral pressure of the soft rock on the anchor body, thereby improving the anchoring force. The head of the anchor body can also be designed to be conical, which makes it easier for the anchor body to be inserted into the soft rock during installation and reduces the installation resistance. At the same time, the conical head can make the soft rock produce a more uniform stress distribution, avoid local stress concentration and cause the soft rock to break, and ensure the reliability of anchoring.
Furthermore, adding auxiliary structures is an important means to improve the anchoring efficiency. A barb structure is set on the nylon speed drive anchor type'w' body. The barb can be opened after the anchor body is inserted into the soft rock, further increasing the friction and mechanical bite between the anchor body and the soft rock. When the soft rock is deformed, the barb can effectively prevent the anchor body from being pulled out. In addition, an annular groove can be opened on the surface of the anchor body. After the anchor body is installed, a highly elastic and high-strength adhesive, such as epoxy resin glue, is injected into the groove. After the adhesive is cured, it can fill the gap between the anchor body and the soft rock, forming a strong bond, tightly combining the anchor body and the soft rock into a whole, and significantly improving the anchoring efficiency.
Fourth, improve the hollow structure design of the anchor body. Designing the nylon speed drive anchor type'w' as a hollow structure can not only reduce the weight of the anchor body itself and facilitate installation, but also provide a channel for grouting. After the anchor body is installed, cement slurry or chemical slurry is injected into the soft rock through the hollow channel. Cement slurry can improve the strength and integrity of soft rock, and chemical slurry such as polyurethane has good expansion properties, which can fill the pores in soft rock and enhance the wrapping force of soft rock on the anchor body. At the same time, the hollow structure can also be built with prestressed steel strands. After the grouting is completed, prestress is applied to the steel strands, so that the anchor body bears the load in advance, improving the bearing capacity and anchoring efficiency of the anchor body.
Fifth, considering the rheological characteristics of soft rock formations, the anchor structure is dynamically optimized. Soft rock will undergo rheological deformation under long-term load, resulting in a decrease in anchoring force. An adjustable support structure, such as a hydraulic telescopic rod, can be set inside the anchor body. When the rheological deformation of the soft rock is detected and the anchoring force is reduced, the telescopic rod is extended through the hydraulic system to apply additional support force to the soft rock to compensate for the loss of anchoring force caused by rheology. In addition, strain sensors can be installed on the surface of the anchor body to monitor the stress and deformation of the anchor body in real time, and the structural parameters of the anchor body can be adjusted in time according to the monitoring data to achieve dynamic control of the anchoring efficiency.
Sixth, strengthen the connection structure between the anchor body and the anchor rod. The connection reliability between the anchor body and the anchor rod directly affects the anchoring efficiency. Use high-strength connectors, such as special threaded joints or flange connections, to ensure that large tension and torque can be transmitted between the anchor body and the anchor rod. At the same time, anti-loosening devices, such as spring washers, anti-loosening nuts, etc., are set at the connection parts to prevent the connection parts from loosening during the vibration or deformation of the soft rock. The connection parts can also be sealed to prevent moisture and corrosive substances in the soft rock from entering the connection parts and affecting the connection strength, so as to ensure that the anchor body and the anchor rod always maintain a good cooperative working state and play an anchoring role together.
Finally, the anchoring efficiency of the nylon speed drive anchor type'w' after structural improvement was verified by combining multiple simulation tests with on-site measurements. The finite element analysis software was used to simulate the stress and deformation of the anchor body under different structural improvement schemes to screen out the optimal structural design scheme. Then, field tests were carried out in actual soft rock formation projects to monitor the anchoring force, displacement and other parameters of the anchor body. The structural design was further optimized based on the test results to ensure that the improved nylon speed drive anchor type'w' can play a stable and efficient anchoring role in soft rock formations.
