在设计重力坝时,我们通常要求上游面不得产生拉应力。其目的是为了防止上游面发生裂缝。我们知道,混凝土的抗拉强度不仅远低于其抗压强度,而且不能确切保证。例如在坝体和基岩的接触面上、水平浇筑缝面上以及某些容易发生质量事故(初凝、终凝等)的部位和埋大块石的部位的抗拉强度,显然是远 When designing a gravity dam, we usually require that no tensile stress be generated on the upstream face. Its purpose is to prevent the occurrence of cracks on the upstream side. We know that the tensile strength of concrete is not only far below its compressive strength, and can not be exactly guaranteed. For example, the contact surface between the dam and bedrock, horizontal pouring seam and some prone to quality accidents (initial setting, final setting, etc.) and the location of the site buried boulders tensile strength is clearly far