{"id":74414,"date":"2023-05-04T15:16:48","date_gmt":"2023-05-04T14:16:48","guid":{"rendered":"https:\/\/www.typsa.com\/?p=74414"},"modified":"2023-10-27T11:18:12","modified_gmt":"2023-10-27T10:18:12","slug":"the-mularroya-tunnel-faces-its-final-stretch","status":"publish","type":"post","link":"https:\/\/www.typsa.com\/en\/the-mularroya-tunnel-faces-its-final-stretch\/","title":{"rendered":"The Mularroya tunnel faces its final stretch"},"content":{"rendered":"

On 13<\/span>th<\/span> March 2023, excavation of the second and final section of the Mularroya tunnel commenced from Paracuellos de la Ribera. The initial 8.2 km section of the tunnel was previously completed after a long and arduous underground journey, involving almost two years of intense work which had started on 24<\/span>th<\/span> November 2020 with the help of the “Creta” tunnel boring machine.\u00a0<\/span>\u00a0<\/span><\/p>\n

Prior to the start of the mechanized excavation, 61 m of conventional excavation had been completed using forepoling minipiles, TH-21 steel ribs, and shotcrete.<\/span>\u00a0<\/span><\/p>\n

The tunnel will be a fundamental element of the Mularroya hydraulic complex, which includes an earthfill dam capable of storing and regulating a reservoir with a capacity of over 103 hm<\/span>3<\/span>.\u00a0<\/span>\u00a0<\/span><\/p>\n

Hydraulic schematic of Mularroya<\/span><\/b>\u00a0<\/span><\/b>\u00a0<\/span>\u00a0<\/span><\/p>\n

The main elements of the project are the already-completed Mularroya dam, the bypass dam and the transfer tunnel.<\/span>\u00a0\u00a0<\/span>\u00a0<\/span><\/p>\n

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General schematic plan of the intervention<\/span><\/span><\/p>\n

For the construction of the 82.5m high Mularroya dam, 4.7 million m<\/span>3<\/span> of loose compacted materials have been used.\u00a0 The dam body itself has a vertical central core of clay, slats of granular material (transition material) and limestone burlap in both walls.<\/span>\u00a0<\/span>\u00a0<\/span><\/p>\n

The bypass blade is 23.5 m high.<\/span>\u00a0<\/span><\/p>\n

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Typical cross section of the dam (maximum height over foundations 82.5 m)<\/span><\/span><\/p>\n

With a total length of 12.6 km, the Mularroya tunnel is one of the most unique hydraulic works carried out in Spain in recent decades, and a reference for hydraulic tunnels under construction in Europe at this time. Its purpose will be to transport surplus water from the Jal\u00f3n River to the Gr\u00edo River basin, thereby maximizing the use of the area’s water resources for irrigation.<\/span>\u00a0<\/span><\/p>\n

The tunnel passes through the municipalities of Calatayud, Paracuellos de la Ribera, El Frasno, and Morata de Jal\u00f3n.\u00a0 With a free inner diameter of 2.9 m and an exterior excavation of 3.5 m, it will have a transfer capacity of up to 8 m3 of water per second.<\/span>\u00a0<\/span><\/p>\n

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General view of the facilities on the <\/span>R<\/span>iver <\/span>Gr\u00edo<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
Start CH\u00a0<\/span><\/b>\u00a0<\/span><\/td>\n\n

12+654,6<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Final CH\u00a0<\/span><\/b>\u00a0<\/span><\/td>\n\n

4+429<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Completed length (m)<\/span><\/b>\u00a0<\/span><\/td>\n\n

8.217,6\u00a0<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Number of rings installed<\/span><\/b>\u00a0<\/span><\/td>\n\n

6848<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Average progress (m\/day)\u00a0<\/span><\/b>\u00a0<\/span><\/td>\n\n

13,11<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Average progress (rings\/day)<\/span><\/b>\u00a0<\/span><\/td>\n\n

10,92<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n

Percentage of tunnel completion (%)<\/span><\/b>\u00a0<\/span><\/td>\n\n

64,94<\/span><\/b>\u00a0<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Summary of section 1 of the <\/span>Mularroya<\/span> tunnel<\/span>, the origin is in the <\/span>Jal\u00f3n<\/span> River<\/span><\/p>\n

Geology<\/span><\/b>\u00a0<\/span><\/p>\n

Materials dated from different geological eras were identified throughout the excavation as follows:<\/span>\u00a0<\/span><\/p>\n