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我队施工的某磷矿属沉积变质磷矿。主要地层自上而下是第四纪浮土，片岩、片麻岩，大理岩，磷灰岩，混合岩。片岩、片麻岩层的厚度约几十米至三百五十米，大理岩层厚度从几十米至二百米不等。片岩、片麻岩层和大理岩层属两个含水层，下部含水层的水文条件比较复杂，其特点是溶蚀现象明显、溶孔、溶洞发育。由于地质构造运动的影响，区内褶皱、断裂构造发育。鉴于上述地质特征，本区漏失情况表现为：1．部分片岩、片麻岩层大裂隙和严重溶蚀的大理岩层或大理岩溶洞及因构造造成的贯通性全漏失；2．部分片岩、片麻岩层的裂隙或部分风化和溶蚀的大理岩层
A phosphorite mine construction team is deposited metamorphic phosphate rock. The main strata from above are Quaternary sediments, schist, gneiss, marble, apatite and mixed rock. Slate, gneiss rock thickness of about tens of meters to 350 meters, marble thickness from tens of meters to two hundred meters. The schist, gneiss and marble layers belong to two aquifers. The hydrologic conditions of the lower aquifer are complex, which are characterized by obvious dissolution and development of dissolved pores and karst caves. Due to the influence of geological tectonic movement, folds and faults in the area are developed. In view of the above geological features, the situation of leakage in this area is as follows: 1. Part of schist, gneiss strata and serious dissolution of the marble layer or marble cave and due to the structure caused by the full loss of connectivity; 2. Part of schist, gneiss strata, or partially weathered and dissolved marble