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我县东临黄海,为海相沉积平原缓坡地区。盐河以东地面高程1.5～2.5米以下土质均为厚约7～10米的压缩性软粘土层,标准贯入击数小于1击,天然含水量一般为12～18%,承载量每平方米约4吨,属软基范围。在这种地基上兴建水工建筑物,必须进行人工处理。过去我县人工地基处理大多沿用砂垫层法。但由于受到砂源和经费的限制,后来,逐步改用粘土垫层法,即先挖掉基础底面以下一部分软弱的天然土层,以人工回填粘土分层夯实,使土层厚度和密实度达到设计要求,从而形成人工地基。
My county east of the Yellow Sea, a gentle slope for the marine sedimentary plain area. The ground elevation below 1.5 to 2.5 meters to the east of the salt river are all compressible soft clay layers with a thickness of about 7 to 10 meters. The standard penetration number is less than 1, and the natural water content is generally 12 to 18%. The bearing capacity per square About 4 tons of rice, is a soft-based range. The construction of hydraulic structures on such foundations must be handled manually. In the past, most of our county artificial foundation treatment followed the sand cushion method. However, due to sand source and funding constraints, and later, gradually switch to the clay cushion method, which first dug below the bottom of the foundation part of the weak natural soil layer to artificial backfill clay Layered compaction, so that soil thickness and density reached Design requirements to create artificial foundations.