求翻译：溶洞顶板出现了较大的向下弯曲变形，底板出现了较大的向上拱起变形，同时基础和溶洞周围产生很大的拉应力集中区，塑性区范围已贯穿至上伏粉质粘土层，表明溶洞已经处于不稳定状态。是什么意思？

The cave roof, large downward bending deformation, the base plate has a large upward arch deformation, base and caves around the large tensile stress concentration range of the plastic zone through the first V silty clay layer, indicating that The cave has been in an unstable state.

There is a karst cave with a large roof down the bent out of shape, base plate with the bow up and distorted, and caves surrounding the drop-down stress concentration areas, plastic areas have been cut across to previous v powder quality clay layer, the caverns have been in an unstable state.

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Downward bending deformation of the cave roof there are large, upward arching the deformation of the backplane appear larger, while base and generated a great deal of stress concentration zone around the cave, plastic throughout the area first Volt silty clay layer, indicating that cave is already i

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