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                                                                                                            山東滕州小型旋挖機廠家聯系電話圖片

                                                                                                            旋挖機在流砂層鉆進塌孔的原因與預防方法

                                                                                                            旋挖機在流砂層鉆進塌孔的原因與預防方法

                                                                                                            發布時間:2020-04-14 瀏覽次數:0 次

                                                                                                            旋挖機在流砂層鉆進塌孔的原因歸納起來有以下六方面:

                                                                                                            (1)護筒腳埋設在粉細砂、粗砂中,由于泥漿柱壓力的作用而造成漏失,無法保持壓力(水頭),造成塌孔;

                                                                                                            (2)地面重型機械在鉆孔附近移機,其重量相當于孔口附近堆載運動產生振動導致地面以下10一15m孔壁坍塌(地壓傳遞深度范圍);

                                                                                                            (3)孔內水位高度未滿足大于地下水位2m的高度要求,或下部砂礫層漏漿;

                                                                                                            (4)鉆斗提升、下降速度過快,產生抽吸負壓及激動壓力沖擊導致孔壁局部垮塌;

                                                                                                            (5)旋挖泥漿配制性能指標如密度、私度、失水量、泥皮厚度滿足不了地質條件要求,或對泥漿管理不善,使性能變壞未及時

                                                                                                            處理;

                                                                                                            (6)旋挖機在鉆進過程中,轉速過快,外緣線速度大,造成孔壁與鉆斗之間環狀間隙泥漿速度很大,對孔壁產生沖刷而垮孔。

                                                                                                            旋挖鉆機在流砂層鉆進圖片

                                                                                                            如何預防這類流砂層垮孔呢?預防旋挖機在流砂層鉆進塌孔的措施應是綜合性的,主要控制好如下六點:

                                                                                                            (1)保證泥漿質量,嚴格控制三項主要指標:密度要大,黏度要大,失水量要??;

                                                                                                            (2)保持孔內水位高,嚴格做到使孔內水位高度大于地下水位2m以上,不得低于2m;

                                                                                                            (3)升、降鉆斗的速度在流砂層段不得大于0.5m/s(要慢速提升、下降);

                                                                                                            (4)回轉鉆進時線速度要慢(旋挖機最低速擋),鉆進速度(進尺)也要慢(給進速度在最低擋);

                                                                                                            (5)回次進尺要短,不得超過0.5m/回次;

                                                                                                            (6)根據地層情況,采用3一4m的長護筒,護筒腳埋放在不漏漿層,最好用三七灰土分層夯實回填。


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