The surrounding rock itself has a certain bearing capacity, so the surrounding rock has both the nature of load and the ability to carry. The proper deformation of the surrounding rock can exert the self-bearing capacity of the surrounding rock and reduce the effect on the support, thereby reducing the bearing strength or rigidity of the support. However, if the surrounding rock is too deformed, the damaged surrounding rock may lose its self-supporting ability. The support will withstand the weight of the falling rock. The greater the stiffness of the support, the higher the load on the support. KIA engine parts, auto parts, valve lifter,valve tappet MIANYANG TAPPET TECHNOLOGY CO., LTD , https://www.tappetracing.com