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墙背倾斜的挡土墙用于什么样的填土好呢？受力怎样？ - 工程施工 - 项目管理 - 氿上知道
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挡墙后填土应该尽量选取透水性高的土，这样地下水可以通过反滤层和泄水孔尽快排泄，不会积在墙后造成填土抗剪强度降低增大墙背土压力。挡墙下部一般要求回填一层粘土防止墙基泡水导致地基承载力降低。
具体填料需要根据现场情况确定，如果土源以粘土为主，那么需要在每层泄水孔标高为主铺一层无粘性土（碎石土、砾石土等）这样地下水可以通过这层无粘性土尽快排泄。
从墙后土压力的观点来看，尽量回填粗颗粒土对减少墙后土压力有好处，因为粗颗粒土综合内摩擦角大，作用在墙背的土压力小，而粘土为细颗粒土，其综合内摩擦角相对小些，而且由于填筑质量问题往往不易夯实，导致土压力过大。